From xen-users-bounces@lists.xenproject.org Thu Nov 01 11:12:04 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Thu, 01 Nov 2018 11:12:04 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gIAsN-0000kI-8T; Thu, 01 Nov 2018 11:10:59 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gIAsL-0000jt-Pa for xen-users@lists.xen.org; Thu, 01 Nov 2018 11:10:57 +0000 X-Inumbo-ID: cd8c81b2-ddc6-11e8-87d6-bc764e045a96 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id cd8c81b2-ddc6-11e8-87d6-bc764e045a96; Thu, 01 Nov 2018 11:10:56 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gIAsB-00085w-16; Thu, 01 Nov 2018 11:10:47 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.89) (envelope-from ) id 1gIAsA-0005QG-UG; Thu, 01 Nov 2018 11:10:46 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.508 (Entity 5.508) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Thu, 01 Nov 2018 11:10:46 +0000 Subject: [Xen-users] Xen Security Advisory 278 v2 (CVE-2018-18883) - x86: Nested VT-x usable even when disabled X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: "Xen.org security team" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2018-18883 / XSA-278 version 2 x86: Nested VT-x usable even when disabled UPDATES IN VERSION 2 ==================== CVE assigned. ISSUE DESCRIPTION ================= When running HVM guests, virtual extensions are enabled in hardware because Xen is using them. As a result, a guest can blindly execute the virtualisation instructions, and will exit to Xen for processing. In the case that the guest hasn't followed the correct (virtual) configuration procedure, it shouldn't be able to use the instructions, and Xen should respond with #UD exception. When nested virtualisation is disabled for the guest, it is not permitted to complete the configuration procedure. Unfortunately, when nested virtualisation is intended to be disabled for the guest, an incorrect default value leads Xen to believe that the configuration procedure has already been completed. IMPACT ====== Guest software which blindly plays with the VT-x instructions can cause Xen to operate on uninitialised data. As the backing memory is zeroed, this causes Xen to suffer a NULL pointer dereference, causing a host Denial of Service. Other behaviours such as memory corruption or privilege escalation have not been ruled out. VULNERABLE SYSTEMS ================== Systems running Xen 4.9 or later are vulnerable. Systems running Xen 4.8 or earlier are not vulnerable. Only Intel x86 systems are vulnerable. Systems from other x86 vendors, and other hardware vendors are not vulnerable. Only x86 HVM and PVH guests can leverage this vulnerability. x86 PV guests cannot leverage this vulnerability. MITIGATION ========== Running only x86 PV guests will avoid the issue. For x86 HVM guests, while enabling nested virtualisation for affected guests does work around this particular DoS, it is not a security supported configuration and has other know DoS and suspected privilege escalation vulnerabilities. Therefore, it is not a mitigation. CREDITS ======= This issue was discovered by Sergey Dyasli of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa278.patch xen-unstable xsa278-4.11.patch Xen 4.11, 4.10, 4.9 $ sha256sum xsa278* d94c59ee170f96af14f0cf696221ba8b9447b86820fe99fba1815ab93cc89cd7 xsa278.patch 22686a9bbfbd38bb74292a28a452012d263875c9064815d4afd3fd6c62df0c3a xsa278-4.11.patch $ NOTE CONCERNING LACK OF EMBARGO =============================== This issue was first reported in private and was in the usual XSA process. It was later independently reported in public with enough detail for the issue to be considered fully public. -----BEGIN PGP SIGNATURE----- iQFABAEBCAAqFiEEI+MiLBRfRHX6gGCng/4UyVfoK9kFAlva3xQMHHBncEB4ZW4u b3JnAAoJEIP+FMlX6CvZ2DUIAKIKRyJ9tb1+t8FVECYVR6L5JjhVjyiC1HKnmmGO o+Fl1glQZqK1b5oKkV58jNf32wUOjhlHut1iXJmuE7VGrBsSzj4ew3wIwFcAeTyL nykIFtS8YBlodQfcd7XRyh030bQ5f5JtJYTyJTpAwor8JQrVJH+lYdv+zddPfVbp sUMXFrSxAmnzhrYKuUHNZ438O6+PwunPROTng6VRmreutqnxjnvxtmLqJLk23gvI jfg8THSawEREg9R6cjpO8ZmfouukTJp7t5mmte1g8kJm/UJ4iRWAS67tYF6m4V+K 1H7Sc0E4yV8I/PL46V+53r43NcCtPFP+GM/AaIzggov2Hn0= =el52 -----END PGP SIGNATURE----- --=separator Content-Type: application/octet-stream; name="xsa278.patch" Content-Disposition: attachment; filename="xsa278.patch" Content-Transfer-Encoding: base64 RnJvbTogQW5kcmV3IENvb3BlciA8YW5kcmV3LmNvb3BlcjNAY2l0cml4LmNv bT4KU3ViamVjdDogeDg2L3Z2bXg6IERpc2FsbG93IHRoZSB1c2Ugb2YgVlQt eCBpbnN0cnVjdGlvbnMgd2hlbiBuZXN0ZWQgdmlydCBpcyBkaXNhYmxlZAoK 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f7b6e54d-697a-4eeb-b855-9e6b06fe6e85 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR0101MB2212 Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============7699328890563739779==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============7699328890563739779== Content-Language: de-DE Content-Type: multipart/alternative; boundary="_000_501FA3A340E7482DB15ED1BD7A82DAA9janzenonl_" --_000_501FA3A340E7482DB15ED1BD7A82DAA9janzenonl_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGksDQoNCkkgaGFkIHRoZXNlIGNyYXNoIHByb2JsZW1zIHdpdGggdGhlIFhlbiB2ZXJzaW9uIGlu IERlYmlhbiBzdHJldGNoLCB0b28uIEFmdGVyIDMgdG8gNyBkYXlzIHRoZSBYZW4gc2VydmVyIHJl 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xen-users@lists.xenproject.org, xen-devel@lists.xenproject.org Content-Type: multipart/mixed; boundary="00000000000008f2da0579a88819" Subject: [Xen-users] [XEN][ARM64] PVUSB device attach causing DomU hang X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --00000000000008f2da0579a88819 Content-Type: multipart/alternative; boundary="00000000000008f2d50579a88817" --00000000000008f2d50579a88817 Content-Type: text/plain; charset="UTF-8" Hi, We are using xen-4.8 stable version. Our board has only USB-3.0. We trying to achieve PVUSB. Added following in the DomU config file. Applied the attached patch for USB front-end driver. Using qemu as back-end. domu.cfg *usbctrl=['version=2, ports=8', ]* *usb=['1.6, controller=0, port=1']* Attached the USB device(mouse and keyboard) using below commands. * xl usbdev-attach domU hostbus=1 hostaddr=6 controller=0 port=1 (Mouse)* * xl usbdev-attach debian hostbus=1 hostaddr=7 controller=0 port=1 (Keyboard)* After executing above getting below logs. [ 2.986905] synth uevent: /devices/virtual/input/input0: failed to send uevent [ 2.986919] input input0: uevent: failed to send synthetic uevent [ 25.689516] usb 1-1: new low-speed USB device number 2 using vusb [ 25.689664] CPU: 0 PID: 282 Comm: kworker/0:2 Not tainted 4.14.0-rc7-linaro-hikey960 #54 [ 25.689683] Hardware name: XENVM-4.8 (DT) [ 25.689706] Workqueue: usb_hub_wq hub_event [ 25.689721] task: ffff80001cd69c00 task.stack: ffff000009540000 [ 25.689743] PC is at xenhcd_gnttab_map.isra.3+0xc/0x18 [ 25.689762] LR is at xenhcd_do_request+0xe8/0x330 [ 25.689778] pc : [] lr : [] pstate: 200001c5 [ 25.689800] sp : ffff000009543950 [ 25.689811] x29: ffff000009543950 x28: ffff80000f8d1200 [ 25.689831] x27: 0000000000000001 x26: 0000000000000001 [ 25.689847] x25: 0000000000000000 x24: ffff80001da7a000 [ 25.689864] x23: 0000000000000000 x22: 0000000000000000 [ 25.689880] x21: ffff80001c70b1b8 x20: 0000000000000000 [ 25.689900] x19: ffff80001db64228 x18: 0000000000000010 [ 25.689918] x17: 0000ffffaf33bb60 x16: 0000000000000020 [ 25.689935] x15: ffffffffffffffff x14: ffff00008919537f [ 25.689954] x13: ffff00000919538d x12: ffff000009069df0 [ 25.689973] x11: ffff00000858afc8 x10: ffff000009543890 [ 25.689990] x9 : ffff00000914a000 x8 : ffff80001c70b1e0 [ 25.690009] x7 : 0000000000000000 x6 : 0000000000000040 [ 25.690027] x5 : 0000000000000001 x4 : 00000000000000ce [ 25.690043] x3 : ffff80001d941000 x2 : 0000000000000017 [ 25.690059] x1 : 0000000000000001 x0 : 0000000000000040 [ 25.690078] Process kworker/0:2 (pid: 282, stack limit = 0xffff000009540000) [ 25.690100] Call trace: [ 25.690110] Exception stack(0xffff000009543810 to 0xffff000009543950) [ 25.690130] 3800: 0000000000000040 0000000000000001 [ 25.690151] 3820: 0000000000000017 ffff80001d941000 00000000000000ce 0000000000000001 [ 25.690172] 3840: 0000000000000040 0000000000000000 ffff80001c70b1e0 ffff00000914a000 [ 25.690194] 3860: ffff000009543890 ffff00000858afc8 ffff000009069df0 ffff00000919538d [ 25.690218] 3880: ffff00008919537f ffffffffffffffff 0000000000000020 0000ffffaf33bb60 [ 25.690243] 38a0: 0000000000000010 ffff80001db64228 0000000000000000 ffff80001c70b1b8 [ 25.690267] 38c0: 0000000000000000 0000000000000000 ffff80001da7a000 0000000000000000 [ 25.690288] 38e0: 0000000000000001 0000000000000001 ffff80000f8d1200 ffff000009543950 [ 25.690312] 3900: ffff00000883b1f0 ffff000009543950 ffff00000883b0fc 00000000200001c5 [ 25.690333] 3920: ffff0000095439a0 ffff0000081154c8 ffffffffffffffff ffff00000883b1dc [ 25.690354] 3940: ffff000009543950 ffff00000883b0fc [ 25.690371] [] xenhcd_gnttab_map.isra.3+0xc/0x18 [ 25.690391] [] xenhcd_urb_enqueue+0xe4/0x138 [ 25.690411] [] usb_hcd_submit_urb+0xa0/0x920 [ 25.690431] [] usb_submit_urb+0x31c/0x518 [ 25.690447] [] usb_start_wait_urb+0x54/0xd8 [ 25.690466] [] usb_control_msg+0xa4/0xf0 [ 25.690482] [] hub_port_init+0x1ec/0xa28 [ 25.690497] [] hub_event+0x7a4/0xf78 [ 25.690517] [] process_one_work+0x1cc/0x338 [ 25.690535] [] worker_thread+0x44/0x470 [ 25.690553] [] kthread+0x12c/0x130 [ 25.690571] [] ret_from_fork+0x10/0x18 Able to see that front-end is able attached these devices. But the problem is DomU hangs. -- Thanks & Regards Vikram KS -- This message contains confidential information and is intended only for the individual(s) named. If you are not the intended recipient, you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this mail and attached file/s is strictly prohibited. Please notify the sender immediately and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secured or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission. --00000000000008f2d50579a88817 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,

We are using x= en-4.8 stable version. Our board has only USB-3.0.
We trying= to achieve PVUSB. Added following in the DomU config file.
Appli= ed the attached patch for USB front-end driver. Using qemu as back-end.
=

domu.cfg
usbctrl=3D['version= =3D2, ports=3D8', ]
usb=3D['1.6, controller=3D= 0, port=3D1']

Attached the USB devi= ce(mouse and keyboard) using below commands.
=C2=A0xl usbdev-a= ttach domU hostbus=3D1 hostaddr=3D6 controller=3D0 port=3D1 (Mouse)
=C2=A0xl usbdev-attach debian hostbus=3D1 hostaddr=3D7 controller= =3D0 port=3D1 (Keyboard)

After executin= g above getting below logs.
[=C2=A0=C2=A0=C2=A0 2.986905] synth u= event: /devices/virtual/input/input0: failed to send uevent
[=C2=A0=C2= =A0=C2=A0 2.986919] input input0: uevent: failed to send synthetic uevent[=C2=A0=C2=A0 25.689516] usb 1-1: new low-speed USB device number 2 using= vusb
[=C2=A0=C2=A0 25.689664] CPU: 0 PID: 282 Comm: kworker/= 0:2 Not tainted 4.14.0-rc7-linaro-hikey960 #54
[=C2=A0=C2=A0 25.689683] = Hardware name: XENVM-4.8 (DT)
[=C2=A0=C2=A0 25.689706] Workqueue: usb_hu= b_wq hub_event
[=C2=A0=C2=A0 25.689721] task: ffff80001cd69c00 task.stac= k: ffff000009540000
[=C2=A0=C2=A0 25.689743] PC is at xenhcd_gnttab_map.= isra.3+0xc/0x18
[=C2=A0=C2=A0 25.689762] LR is at xenhcd_do_request+0xe8= /0x330
[=C2=A0=C2=A0 25.689778] pc : [<ffff00000883b0fc>] lr : [&l= t;ffff00000883b1f0>] pstate: 200001c5
[=C2=A0=C2=A0 25.689800] sp : f= fff000009543950
[=C2=A0=C2=A0 25.689811] x29: ffff000009543950 x28: ffff= 80000f8d1200
[=C2=A0=C2=A0 25.689831] x27: 0000000000000001 x26: 000000= 0000000001
[=C2=A0=C2=A0 25.689847] x25: 0000000000000000 x24: ffff8000= 1da7a000
[=C2=A0=C2=A0 25.689864] x23: 0000000000000000 x22: 0000000000= 000000
[=C2=A0=C2=A0 25.689880] x21: ffff80001c70b1b8 x20: 000000000000= 0000
[=C2=A0=C2=A0 25.689900] x19: ffff80001db64228 x18: 00000000000000= 10
[=C2=A0=C2=A0 25.689918] x17: 0000ffffaf33bb60 x16: 0000000000000020=
[=C2=A0=C2=A0 25.689935] x15: ffffffffffffffff x14: ffff00008919537f <= br>[=C2=A0=C2=A0 25.689954] x13: ffff00000919538d x12: ffff000009069df0 [=C2=A0=C2=A0 25.689973] x11: ffff00000858afc8 x10: ffff000009543890
[= =C2=A0=C2=A0 25.689990] x9 : ffff00000914a000 x8 : ffff80001c70b1e0
[= =C2=A0=C2=A0 25.690009] x7 : 0000000000000000 x6 : 0000000000000040
[= =C2=A0=C2=A0 25.690027] x5 : 0000000000000001 x4 : 00000000000000ce
[= =C2=A0=C2=A0 25.690043] x3 : ffff80001d941000 x2 : 0000000000000017
[= =C2=A0=C2=A0 25.690059] x1 : 0000000000000001 x0 : 0000000000000040
[= =C2=A0=C2=A0 25.690078] Process kworker/0:2 (pid: 282, stack limit =3D 0xff= ff000009540000)
[=C2=A0=C2=A0 25.690100] Call trace:
[=C2=A0=C2=A0 25= .690110] Exception stack(0xffff000009543810 to 0xffff000009543950)
[=C2= =A0=C2=A0 25.690130] 3800:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 0000000000000040 0000000000000001
[=C2=A0=C2=A0 25.690151] 3820: = 0000000000000017 ffff80001d941000 00000000000000ce 0000000000000001
[=C2= =A0=C2=A0 25.690172] 3840: 0000000000000040 0000000000000000 ffff80001c70b1= e0 ffff00000914a000
[=C2=A0=C2=A0 25.690194] 3860: ffff000009543890 ffff= 00000858afc8 ffff000009069df0 ffff00000919538d
[=C2=A0=C2=A0 25.690218] = 3880: ffff00008919537f ffffffffffffffff 0000000000000020 0000ffffaf33bb60[=C2=A0=C2=A0 25.690243] 38a0: 0000000000000010 ffff80001db64228 00000000= 00000000 ffff80001c70b1b8
[=C2=A0=C2=A0 25.690267] 38c0: 000000000000000= 0 0000000000000000 ffff80001da7a000 0000000000000000
[=C2=A0=C2=A0 25.69= 0288] 38e0: 0000000000000001 0000000000000001 ffff80000f8d1200 ffff00000954= 3950
[=C2=A0=C2=A0 25.690312] 3900: ffff00000883b1f0 ffff000009543950 ff= ff00000883b0fc 00000000200001c5
[=C2=A0=C2=A0 25.690333] 3920: ffff00000= 95439a0 ffff0000081154c8 ffffffffffffffff ffff00000883b1dc
[=C2=A0=C2=A0= 25.690354] 3940: ffff000009543950 ffff00000883b0fc
[=C2=A0=C2=A0 25.690= 371] [<ffff00000883b0fc>] xenhcd_gnttab_map.isra.3+0xc/0x18
[=C2= =A0=C2=A0 25.690391] [<ffff00000883b7ac>] xenhcd_urb_enqueue+0xe4/0x1= 38
[=C2=A0=C2=A0 25.690411] [<ffff0000087d42d8>] usb_hcd_submit_ur= b+0xa0/0x920
[=C2=A0=C2=A0 25.690431] [<ffff0000087d5c04>] usb_sub= mit_urb+0x31c/0x518
[=C2=A0=C2=A0 25.690447] [<ffff0000087d6444>] = usb_start_wait_urb+0x54/0xd8
[=C2=A0=C2=A0 25.690466] [<ffff0000087d6= 56c>] usb_control_msg+0xa4/0xf0
[=C2=A0=C2=A0 25.690482] [<ffff000= 0087cd244>] hub_port_init+0x1ec/0xa28
[=C2=A0=C2=A0 25.690497] [<f= fff0000087d09c4>] hub_event+0x7a4/0xf78
[=C2=A0=C2=A0 25.690517] [<= ;ffff0000080dedc4>] process_one_work+0x1cc/0x338
[=C2=A0=C2=A0 25.690= 535] [<ffff0000080def74>] worker_thread+0x44/0x470
[=C2=A0=C2=A0 2= 5.690553] [<ffff0000080e5134>] kthread+0x12c/0x130
[=C2=A0=C2=A0 2= 5.690571] [<ffff000008084b58>] ret_from_fork+0x10/0x18
=
Able to see that front-end is able attached these devices.
But the problem is DomU hangs.




--
Thanks & Regards
Vik= ram KS

This message contains confidential information and is intended only for the individual(s) named. If you are not the = intended recipient, you are notified that disclosing, copying, distributing or takin= g any action in reliance on the contents of this mail and attached file/s is stri= ctly prohibited. Please notify the sender immediately and delete this e-mail from your system. E-mail transmis= sion cannot be guaranteed to be secured or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or cont= ain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mai= l transmission.

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16:24:24 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gIcE8-0008Rc-7l; Fri, 02 Nov 2018 16:23:16 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gIcE6-0008RR-Tc for xen-users@lists.xenproject.org; Fri, 02 Nov 2018 16:23:14 +0000 X-Inumbo-ID: 98a8c4d8-debb-11e8-9a16-bc764e045a96 Received: from mail-it1-x141.google.com (unknown [2607:f8b0:4864:20::141]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id 98a8c4d8-debb-11e8-9a16-bc764e045a96; Fri, 02 Nov 2018 16:23:13 +0000 (UTC) Received: by mail-it1-x141.google.com with SMTP id t189-v6so1852412itf.1 for ; Fri, 02 Nov 2018 09:23:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=m6uwl9n+mrbLrmScWaYenGTeJKIzD2IOTKAsSCEecgs=; 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AGRZ1gKZWDrH666KGUnACosOJJrqXMNircv4r09A0s4us4fCAx4JbYl5 tti8E4dNueCcQxfP96aqyhUDscVgU3LOFu2DvTDYbQ== X-Google-Smtp-Source: AJdET5d3fAH7rW24ElXKjM/IY02AFOPR3NmJKkA/G++u72nBU2gSEaUxNCCMnK/HVsaDorq3VT13/VfB64kNIFAtn+w= X-Received: by 2002:a02:15d3:: with SMTP id 80-v6mr11299638jaq.116.1541175793183; Fri, 02 Nov 2018 09:23:13 -0700 (PDT) MIME-Version: 1.0 References: <501FA3A3-40E7-482D-B15E-D1BD7A82DAA9@janzen.onl> In-Reply-To: <501FA3A3-40E7-482D-B15E-D1BD7A82DAA9@janzen.onl> From: John Naggets Date: Fri, 2 Nov 2018 17:23:00 +0100 Message-ID: To: volker@janzen.onl Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-users@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============2884610989145053930==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============2884610989145053930== Content-Type: multipart/alternative; boundary="000000000000b079cd0579b0f357" --000000000000b079cd0579b0f357 Content-Type: text/plain; charset="UTF-8" I was wondering if any of you guys reported this bug/issue/problem back to the Debian community? For example on their bugs.debian org web site? On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen wrote: > Hi, > > I had these crash problems with the Xen version in Debian stretch, too. > After 3 to 7 days the Xen server rebooted without log entry or something > else to observe. The problems started when the first patches were applied > by Debian. Some updates made it better, the last worse again. I checked > hard drives, RAM and closely monitored metrics what might be the cause. > > My solution after no longer suspecting a hardware fault: build upstream > Xen 4.11 for Debian stretch. I am currently running this setup with my own > build of kernel 4.19. The machines are now working stable again. > > > Volker > > > Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower < > roalt.zijlstra@webpower.nl>: > > Hi there, > > Ever since all the Meltdown and Spectre kernel updates and possibly also > Xen 4.8 updates, we experience crashes of the Dom0 just out of the blue. > Sometimes after 1 day, sometimes after a few days or even 14 days, > completely random. > > We have two Dell P730 servers and two Dell P720 servers with this > behaviour. One thing is that we updated these machine to the latest > available firmware, because that is the most secure way. Then we installed > Debian Stretch with Xen 4.8 support > > We have done serveral installs and 4 servers seem to crash pretty fast and > other don't. In the end we think that we can lead it back to the > xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unstable. > This was kinda independent of the kernel that we were using 4.14 or > 4.9.0-8-amd64. This is off course all Debian package numbering. > > As last resort we updated on one server all DomU kernels of our Jessie > servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. > For now that seems to work, but the crashes are random so it could happen > any time again. The idea is that these kernels are completely spectre& > meltdown unaware and might cause trouble in Xen kernel support. I am not > sure if this is true at all, but we are pretty lost what the actual cause > is. > > We also tested with CentOS and we also had these crashes there with > certain combinations of kernel/Xen. The most recent updates seem to be more > stable tough. The most frustrating part is the there is absolutely no logs > to be found. No kernel oops or what.. the server just resets and boots > again. > > Are there others experiencing problems like this? Do you see more frequent > server/kernel crashes on production servers? > > Best regards, > Roalt Zijlstra > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xenproject.org > https://lists.xenproject.org/mailman/listinfo/xen-users > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xenproject.org > https://lists.xenproject.org/mailman/listinfo/xen-users --000000000000b079cd0579b0f357 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I was wondering if any of you guys report= ed this bug/issue/problem back to the Debian community? For example on thei= r bugs.debian org web site?

<= div dir=3D"ltr">On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen <volker@jan= zen.onl> wrote:
Hi,

I had these crash problems with the Xen version in Debian = stretch, too. After 3 to 7 days the Xen server rebooted without log entry o= r something else to observe. The problems started when the first patches we= re applied by Debian. Some updates made it better, the last worse again. I checked hard drives, RAM and close= ly monitored metrics what might be the cause.

My solution after no longer suspecting a hardware fault: b= uild upstream Xen 4.11 for Debian stretch. I am currently running this setu= p with my own build of kernel 4.19. The machines are now working stable aga= in.


=C2=A0=C2=A0 =C2=A0Volker


Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower <roalt.zijlstra@webpower.n= l>:

Hi there,

Ever since all the Meltdown and Spectre kernel updates and possibly also Xe= n 4.8 updates, we experience crashes of the Dom0 just out of the blue. Some= times after 1 day, sometimes after a few days or even 14 days, completely r= andom.

We have two Dell P730 servers and two Dell P720 servers with this behaviour= . One thing is that we updated these machine to the latest available firmwa= re, because that is the most secure way. Then we installed Debian Stretch w= ith Xen 4.8 support

We have done serveral installs and 4 servers seem to crash pretty fast and = other don't. In the end we think that we can lead it back to the xen-4.= 8.4-pre version being stable and the xen-4.8.5-pre being unstable. This was= kinda independent of the kernel that we were using 4.14 or 4.9.0-8-amd64. This is off course all Debian package= numbering.

As last resort=C2=A0 we updated on one server all DomU kernels of our Jessi= e servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. = For now that seems to work, but the crashes are random so it could happen a= ny time again. The idea is that these kernels are completely spectre& meltdown unaware and might cause troub= le in Xen kernel support. I am not sure if this is true at all, but we are = pretty lost what the actual cause is.

We also tested with CentOS and we also had these crashes there with certain= combinations of kernel/Xen. The most recent updates seem to be more stable= tough. The most frustrating part is the there is absolutely no logs to be = found. No kernel oops or what.. the server just resets and boots again.

Are there others experiencing problems like this? Do you see more frequent = server/kernel crashes on production servers?=C2=A0=C2=A0

Best regards,
=C2=A0
Roalt Zijlstra
_______________________________________________
Xen-users mailing list
X= en-users@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
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jNzaE/vQGaiNC6Fuk+DspqG6ZDQ4HjNuxQ5YfbxrND3zEnErvVubl69OW3WbLkXnHjxVXjcFHWVGxDyRMpQdTe/VW4sVNKTSFx/IGauvT+cV33T3nuvR9P0hse4MldBPte/YrrCANtX8IUH5epvDOgvHWvXYdnZHvIgGtNcfKlLUYACSTIuK9kjP5ODurd4Z3pJQCuAqRmH6pB6hOXKOLkHqNysC3nRGSJuYgt6FTkcxqGBUPgXAlgSVbvH5ReLbxSNFWckz61XNaSn+IcKX2QAuuTldYhhUSfv1sPUh/LiuA0VOI7uATrhA9CSvqHcKfCvp7eEh9V4yMCXQNPE3zYontqg18kNgFZ73Op/8n/M= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-OriginatorOrg: janzen.onl X-MS-Exchange-CrossTenant-Network-Message-Id: 1ca63c1b-c17a-4ee4-aef0-08d640f4807c X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Nov 2018 18:53:39.0575 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f7b6e54d-697a-4eeb-b855-9e6b06fe6e85 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR0101MB1924 Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list 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References: <501FA3A3-40E7-482D-B15E-D1BD7A82DAA9@janzen.onl> In-Reply-To: From: "Roalt Zijlstra | webpower" Date: Fri, 2 Nov 2018 20:19:21 +0100 Message-ID: To: hostingnuggets@gmail.com Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: volker@janzen.onl, xen-users@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============8777385409867703048==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============8777385409867703048== Content-Type: multipart/alternative; boundary="00000000000066e5e50579b36a27" --00000000000066e5e50579b36a27 Content-Type: text/plain; charset="UTF-8" Hi Volker, Actually I did not yet. I might do so even though the log-reporting is very sparse. We also noticed this in CentOS packages and we still figuring out what was going on. If I get some time I will file a bug. But I am sure it is updates in kernels and Xen due to spectre/meltdown. Best regards, Roalt Zijlstra Teamleader Infra & Deliverability roalt.zijlstra@webpower.nl +31 342 423 262 roalt.zijlstra https://www.webpower-group.com [image: Facebook] [image: Twitter] [image: Linkedin] Barcelona | Barneveld | Beijing | Chengdu | Guangzhou Hamburg | Shanghai | Shenzhen | Stockholm Op vr 2 nov. 2018 om 17:36 schreef John Naggets : > I was wondering if any of you guys reported this bug/issue/problem back to > the Debian community? For example on their bugs.debian org web site? > > On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen wrote: > >> Hi, >> >> I had these crash problems with the Xen version in Debian stretch, too. >> After 3 to 7 days the Xen server rebooted without log entry or something >> else to observe. The problems started when the first patches were applied >> by Debian. Some updates made it better, the last worse again. I checked >> hard drives, RAM and closely monitored metrics what might be the cause. >> >> My solution after no longer suspecting a hardware fault: build upstream >> Xen 4.11 for Debian stretch. I am currently running this setup with my own >> build of kernel 4.19. The machines are now working stable again. >> >> >> Volker >> >> >> Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower < >> roalt.zijlstra@webpower.nl>: >> >> Hi there, >> >> Ever since all the Meltdown and Spectre kernel updates and possibly also >> Xen 4.8 updates, we experience crashes of the Dom0 just out of the blue. >> Sometimes after 1 day, sometimes after a few days or even 14 days, >> completely random. >> >> We have two Dell P730 servers and two Dell P720 servers with this >> behaviour. One thing is that we updated these machine to the latest >> available firmware, because that is the most secure way. Then we installed >> Debian Stretch with Xen 4.8 support >> >> We have done serveral installs and 4 servers seem to crash pretty fast >> and other don't. In the end we think that we can lead it back to the >> xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unstable. >> This was kinda independent of the kernel that we were using 4.14 or >> 4.9.0-8-amd64. This is off course all Debian package numbering. >> >> As last resort we updated on one server all DomU kernels of our Jessie >> servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. >> For now that seems to work, but the crashes are random so it could happen >> any time again. The idea is that these kernels are completely spectre& >> meltdown unaware and might cause trouble in Xen kernel support. I am not >> sure if this is true at all, but we are pretty lost what the actual cause >> is. >> >> We also tested with CentOS and we also had these crashes there with >> certain combinations of kernel/Xen. The most recent updates seem to be more >> stable tough. The most frustrating part is the there is absolutely no logs >> to be found. No kernel oops or what.. the server just resets and boots >> again. >> >> Are there others experiencing problems like this? Do you see more >> frequent server/kernel crashes on production servers? >> >> Best regards, >> Roalt Zijlstra >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xenproject.org >> https://lists.xenproject.org/mailman/listinfo/xen-users >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xenproject.org >> https://lists.xenproject.org/mailman/listinfo/xen-users > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xenproject.org > https://lists.xenproject.org/mailman/listinfo/xen-users --00000000000066e5e50579b36a27 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Volker,

=
Actually I did not yet. I might do so even though = the log-reporting is very sparse. We also noticed this in CentOS packages a= nd we still figuring out what was going on. If I get some time I will file = a bug.=C2=A0 But I am sure it is updates in kernels and Xen due to spectre/= meltdown.

<= div dir=3D"ltr">
<= tr>=
Best regard= s,
=C2=A0
=C2=A0Roalt Zijlstra
=C2=A0= =C2=A0Teamleader Infra & Deliverability
=C2=A0= =C2=A0<= font face=3D"verdana, sans-serif">=C2=A0
=C2=A0roa= lt.zijlstra@webpower.nl
=C2=A0+31 342 423 262
=C2=A0roalt.zijlstra
=C2=A0https://www.w= ebpower-group.com
=C2=A0
=
=C2=A0
3D"Facebook"=C2= =A03D"Twitter"=C2=A03D"Linkedin"
Barcelona | Barneveld | Beijing |= Chengdu | Guangzhou
Hamburg | Shanghai | Shenzhen | Stockholm=C2=A0=


Op vr 2 nov. 2018 om 17:36 schreef= John Naggets <hostingnugget= s@gmail.com>:
I was wondering if any of you guys reported this bug/is= sue/problem back to the Debian community? For example on their bugs.debian = org web site?

On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen <volker@janzen.onl> wr= ote:
Hi,

I had these crash problems with the Xen version in Debian = stretch, too. After 3 to 7 days the Xen server rebooted without log entry o= r something else to observe. The problems started when the first patches we= re applied by Debian. Some updates made it better, the last worse again. I checked hard drives, RAM and close= ly monitored metrics what might be the cause.

My solution after no longer suspecting a hardware fault: b= uild upstream Xen 4.11 for Debian stretch. I am currently running this setu= p with my own build of kernel 4.19. The machines are now working stable aga= in.


=C2=A0=C2=A0 =C2=A0Volker


Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower <roalt.zijlstra@webpower.n= l>:

Hi there,

Ever since all the Meltdown and Spectre kernel updates and possibly also Xe= n 4.8 updates, we experience crashes of the Dom0 just out of the blue. Some= times after 1 day, sometimes after a few days or even 14 days, completely r= andom.

We have two Dell P730 servers and two Dell P720 servers with this behaviour= . One thing is that we updated these machine to the latest available firmwa= re, because that is the most secure way. Then we installed Debian Stretch w= ith Xen 4.8 support

We have done serveral installs and 4 servers seem to crash pretty fast and = other don't. In the end we think that we can lead it back to the xen-4.= 8.4-pre version being stable and the xen-4.8.5-pre being unstable. This was= kinda independent of the kernel that we were using 4.14 or 4.9.0-8-amd64. This is off course all Debian package= numbering.

As last resort=C2=A0 we updated on one server all DomU kernels of our Jessi= e servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. = For now that seems to work, but the crashes are random so it could happen a= ny time again. The idea is that these kernels are completely spectre& meltdown unaware and might cause troub= le in Xen kernel support. I am not sure if this is true at all, but we are = pretty lost what the actual cause is.

We also tested with CentOS and we also had these crashes there with certain= combinations of kernel/Xen. The most recent updates seem to be more stable= tough. The most frustrating part is the there is absolutely no logs to be = found. No kernel oops or what.. the server just resets and boots again.

Are there others experiencing problems like this? Do you see more frequent = server/kernel crashes on production servers?=C2=A0=C2=A0

Best regards,
=C2=A0
Roalt Zijlstra
_______________________________________________
Xen-users mailing list
X= en-users@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
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Hello,

Please provide inputs on how to debug this issue.
Is this due to some wrong configuration provide in the config file?

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And Im not entirely sure where to start. Xorg just throws= out a GL_out_of_memory error.

This does not happen when booting the system without xen.

I have tried with both the radeon and am= dgpu (opensource) drivers.

The only half-way workaround was to delete my desktop background. But th= en, firefox shows up as a garbled mess of artifacts.

Or I could rebuild mesa to not even use the vi= deo card. But... Then I use so much of my system even browsing the web, the= re's nothing left for any DomU.
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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <05ecacd0ac375a730567581989281945.squirrel@swampthing.dk> Content-Language: en_US Subject: Re: [Xen-users] Debian Testing with Xen 4.11 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" SGksCgpPbiAxMS8wNC8yMDE4IDA5OjU3IFBNLCBUb3JiZW4gU2Nob3UgSmVuc2VuIHdyb3RlOgo+ IERlYmlhbiBUZXN0aW5nIHdhcyBqdXN0IHVwZ3JhZGVkIGZyb20gWGVuIDQuOCB0byBYZW4gNC4x MS4KPiAKPiBBbGwgZmluZSwgZXhjZXB0IHB5Z3J1YiBub3cgaGF2ZSBiZWVuIHJlbW92ZWQuCgpZ ZXMsIHRoYXQncyBhIGJ1ZywgYWN0dWFsbHkuIEl0J3Mgc3VwcG9zZWQgdG8gYmUgaW4gdGhlcmUu CgpodHRwczovL2J1Z3MuZGViaWFuLm9yZy9jZ2ktYmluL2J1Z3JlcG9ydC5jZ2k/YnVnPTkxMjM4 MQoKPiBJIHNvbHZlZCBpdCBieSB1c2luZyBuZXcgZ3J1YjIgYm9vdCBtZXRob2QgZm9yIGRvbXUu CgpUaGF0J3Mgbm90IGEgYmFkIGNoYW5nZS4gSSBjYW4gcmVjb21tZW5kIHVzaW5nIHB2Z3J1YjIu Cgo+ICNib290bG9hZGVyID0gJy91c3IvbGliL3hlbi00LjgvYmluL3B5Z3J1YicKPiBrZXJuZWwg PSAiL3Vzci9saWIvZ3J1Yi14ZW4vZ3J1Yi14ODZfNjQteGVuLmJpbiIKPiAKPiBCdXQgdGhlbiBJ IHNlZSBsaWJ2aXJ0ZCBhY3RpdmUgYW5kIHVzaW5nIGEgZ29vZCBwYXJ0IG9mIGRvbTAgbWVtb3J5 Lgo+IFRvIG15IGtub3dsZWRnZSBYZW4gaXMgbm93IGZ1bGwgbWFuYWdlZCBieSB4bCwgYW5kIGRh dGEgZnJvbSB0aGlzIGlzIG5vdAo+IHNoYXJlZCB3aXRoIGxpYnZpcnRkLgo+IElzIGl0IHNhZmUg dG8gY29tcGxldGUgcmVtb3ZlIGxpYnZpcnQgZnJvbSBzeXN0ZW0/Pz8KCklmIHlvdSBhcmUgb25s eSB1c2luZyB4bCB5b3Vyc2VsZiB0byBkbyB0aGluZ3MsIHRoZW4gSSBndWVzcyB5ZXMuIFhlbiBi eQppdHNlbGYgZG9lcyBub3QgZG8gYW55dGhpbmcgd2l0aCBsaWJ2aXJ0LgoKSGFucwoKX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLXVzZXJzIG1haWxp bmcgbGlzdApYZW4tdXNlcnNAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0cy54ZW5w cm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi11c2Vycw== From xen-users-bounces@lists.xenproject.org Mon Nov 05 08:46:24 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Mon, 05 Nov 2018 08:46:24 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gJaVJ-0004ju-2s; 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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=BxBzi8pEJ98ujKSPjF61+3hp7Op406B+Rvp1Zf+58Kk=; b=sNwUFh1qzQISFS9CcKQFfhMTFxvxv3Xnhhe555aAyjbw20b82dKjD3/5O1pqWos1Gd n7AHtDLyr8rDrccq9LJRQrXwoAaxZC/orPWjhz3lsIuHblMnXOa2d3FdLpoJY/VdSkbC Fx0jyLE2GA0z6TfsRogalpc1ff76vlCT5as+8a/kr1NhxEYfctWWXvouvBkIMGcWh7JD tX8zvX3A+4TrIjovp3OgtU2E9oBe2Cn7JFaHruryOsoPkClrrpFEz+AyNzY4NTHcFgtl r5NMpXyzjeli0/S2bIgpbKzbDRZRfrwXzPhXP9U1Zm8EgtO41YqVBr78aQQ1ZstLsKnq 3Mgg== X-Gm-Message-State: AGRZ1gJvEs8X7qNiBGDKYRibAJFSEgsP946iMlTiHr91UgAzodXB/A60 7qWQo/a1//Hnh46wg1mC7BlMvoVufhsJfmdAxWDCzCvl X-Google-Smtp-Source: AJdET5cDowRe2Jn52+IeFXwRUE4qf92aW71xO736Eo2oTnpPBNGiQ26dUA2VRuewkZkEnXvbCn+xi6BeUlrivAkIDUo= X-Received: by 2002:a6b:7f0b:: with SMTP id l11-v6mr17965360ioq.221.1541410451961; Mon, 05 Nov 2018 01:34:11 -0800 (PST) MIME-Version: 1.0 References: <501FA3A3-40E7-482D-B15E-D1BD7A82DAA9@janzen.onl> <0C698F19-82EB-4354-8E07-D33EC5977EAF@janzen.onl> In-Reply-To: <0C698F19-82EB-4354-8E07-D33EC5977EAF@janzen.onl> From: John Naggets Date: Mon, 5 Nov 2018 10:33:59 +0100 Message-ID: To: volker@janzen.onl Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-users@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============8077234548977521874==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============8077234548977521874== Content-Type: multipart/alternative; boundary="000000000000713d030579e79636" --000000000000713d030579e79636 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, Thanks for your feedback. I was wondering because I have just upgraded a Debian 9 server to the latest kernel with the latest Xen packages from the official Debian repo. The only difference is that I have an older IBM server which is already ~7 years old patched with the latest BIOS/UEFI and so far so good no crash. The uptime is 6 days for now. Here are the details about my kernel and xen packages. ii xen-hypervisor-4.8-amd64 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Xen Hypervisor on AMD64 ii linux-image-4.9.0-8-amd64 4.9.110-3+deb9u6 amd64 Linux 4.9 for 64-bit PCs Regards, J. On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen wrote: > Hi John, > > the problem is that I cannot provide any metrics or logfiles showing an > error. I can only tell that dom0 is rebooting for a reason that is not > logged. I have no physical access to the server. I got one other report > about this kind of issue. > > My assumption the cause are the backported patches is based on the curren= t > 16 day uptime. 16 days ago the server rebooted every 3-5 days. It won=E2= =80=99t be > a useful bug report from my point of view. > > The other thing is that my two servers are now running upstream Xen and > kernel and I might not go back to both old versions in Debian stretch. Th= e > other server had always running upstream versions and had never a problem= , > that=E2=80=99s why I updated the other, too. > > > Best regards > Volker > > > Am 02.11.2018 um 17:23 schrieb John Naggets : > > I was wondering if any of you guys reported this bug/issue/problem back t= o > the Debian community? For example on their bugs.debian org web site? > > On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen wrote: > >> Hi, >> >> I had these crash problems with the Xen version in Debian stretch, too. >> After 3 to 7 days the Xen server rebooted without log entry or something >> else to observe. The problems started when the first patches were applie= d >> by Debian. Some updates made it better, the last worse again. I checked >> hard drives, RAM and closely monitored metrics what might be the cause. >> >> My solution after no longer suspecting a hardware fault: build upstream >> Xen 4.11 for Debian stretch. I am currently running this setup with my o= wn >> build of kernel 4.19. The machines are now working stable again. >> >> >> Volker >> >> >> Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower < >> roalt.zijlstra@webpower.nl>: >> >> Hi there, >> >> Ever since all the Meltdown and Spectre kernel updates and possibly also >> Xen 4.8 updates, we experience crashes of the Dom0 just out of the blue. >> Sometimes after 1 day, sometimes after a few days or even 14 days, >> completely random. >> >> We have two Dell P730 servers and two Dell P720 servers with this >> behaviour. One thing is that we updated these machine to the latest >> available firmware, because that is the most secure way. Then we install= ed >> Debian Stretch with Xen 4.8 support >> >> We have done serveral installs and 4 servers seem to crash pretty fast >> and other don't. In the end we think that we can lead it back to the >> xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unstable. >> This was kinda independent of the kernel that we were using 4.14 or >> 4.9.0-8-amd64. This is off course all Debian package numbering. >> >> As last resort we updated on one server all DomU kernels of our Jessie >> servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. >> For now that seems to work, but the crashes are random so it could happe= n >> any time again. The idea is that these kernels are completely spectre& >> meltdown unaware and might cause trouble in Xen kernel support. I am not >> sure if this is true at all, but we are pretty lost what the actual caus= e >> is. >> >> We also tested with CentOS and we also had these crashes there with >> certain combinations of kernel/Xen. The most recent updates seem to be m= ore >> stable tough. The most frustrating part is the there is absolutely no lo= gs >> to be found. No kernel oops or what.. the server just resets and boots >> again. >> >> Are there others experiencing problems like this? Do you see more >> frequent server/kernel crashes on production servers? >> >> Best regards, >> Roalt Zijlstra >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xenproject.org >> https://lists.xenproject.org/mailman/listinfo/xen-users >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xenproject.org >> https://lists.xenproject.org/mailman/listinfo/xen-users > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xenproject.org > https://lists.xenproject.org/mailman/listinfo/xen-users --000000000000713d030579e79636 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,

<= /div>
Thanks for your feedback. I was wondering because I have just upg= raded a Debian 9 server to the latest kernel with the latest Xen packages f= rom the official Debian repo. The only difference is that I have an older I= BM server which is already ~7 years old patched with the latest BIOS/UEFI a= nd so far so good no crash. The uptime is 6 days for now. Here are the deta= ils about my kernel and xen packages.

ii=C2=A0 xen= -hypervisor-4.8-amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4.8.4+xsa273+shim= 4.10.1+xsa273-1+deb9u10 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Xen= Hypervisor on AMD64
ii=C2=A0 linux-image-4.9.0-8-amd64=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 4.9.110-3+deb9u6=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Linux 4.9 for 64-bit PCs

Regards,
J= .


=
On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen <volker@ja= nzen.onl> wrote:
Hi John,

the problem is that I cannot provide any metrics or logfiles showing a= n error. I can only tell that dom0 is rebooting for a reason that is not lo= gged. I have no physical access to the server. I got one other report about= this kind of issue.

My assumption the cause are the backported patches is based on the cur= rent 16 day uptime. 16 days ago the server rebooted every 3-5 days. It won= =E2=80=99t be a useful bug report from my point of view.

The other thing is that my two servers are now running upstream Xen an= d kernel and I might not go back to both old versions in Debian stretch. Th= e other server had always running upstream versions and had never a problem= , that=E2=80=99s why I updated the other, too.


Best regards
=C2=A0=C2=A0 =C2=A0Volker


Am 02.11.2018 um 17:23 schrieb John Naggets <hostingnuggets@gmail.com>:

I was wondering if any of you guys reported this bug/issue= /problem back to the Debian community? For example on their bugs.debian org= web site?

On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen <volker@janzen.onl> w= rote:
Hi,

I had these crash problems with the Xen version in Debian = stretch, too. After 3 to 7 days the Xen server rebooted without log entry o= r something else to observe. The problems started when the first patches we= re applied by Debian. Some updates made it better, the last worse again. I checked hard drives, RAM and close= ly monitored metrics what might be the cause.

My solution after no longer suspecting a hardware fault: b= uild upstream Xen 4.11 for Debian stretch. I am currently running this setu= p with my own build of kernel 4.19. The machines are now working stable aga= in.


=C2=A0=C2=A0 =C2=A0Volker


Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower <roalt.zijlstra@webpower.n= l>:

Hi there,

Ever since all the Meltdown and Spectre kernel updates and possibly also Xe= n 4.8 updates, we experience crashes of the Dom0 just out of the blue. Some= times after 1 day, sometimes after a few days or even 14 days, completely r= andom.

We have two Dell P730 servers and two Dell P720 servers with this behaviour= . One thing is that we updated these machine to the latest available firmwa= re, because that is the most secure way. Then we installed Debian Stretch w= ith Xen 4.8 support

We have done serveral installs and 4 servers seem to crash pretty fast and = other don't. In the end we think that we can lead it back to the xen-4.= 8.4-pre version being stable and the xen-4.8.5-pre being unstable. This was= kinda independent of the kernel that we were using 4.14 or 4.9.0-8-amd64. This is off course all Debian package= numbering.

As last resort=C2=A0 we updated on one server all DomU kernels of our Jessi= e servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. = For now that seems to work, but the crashes are random so it could happen a= ny time again. The idea is that these kernels are completely spectre& meltdown unaware and might cause troub= le in Xen kernel support. I am not sure if this is true at all, but we are = pretty lost what the actual cause is.

We also tested with CentOS and we also had these crashes there with certain= combinations of kernel/Xen. The most recent updates seem to be more stable= tough. The most frustrating part is the there is absolutely no logs to be = found. No kernel oops or what.. the server just resets and boots again.

Are there others experiencing problems like this? Do you see more frequent = server/kernel crashes on production servers?=C2=A0=C2=A0

Best regards,
=C2=A0
Roalt Zijlstra
_______________________________________________
Xen-users mailing list
X= en-users@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
--000000000000713d030579e79636-- --===============8077234548977521874== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLXVzZXJz IG1haWxpbmcgbGlzdApYZW4tdXNlcnNAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0 cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi11c2Vycw== --===============8077234548977521874==-- From xen-users-bounces@lists.xenproject.org Mon Nov 05 14:05:32 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Mon, 05 Nov 2018 14:05:32 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gJfU9-0001mJ-9v; Mon, 05 Nov 2018 14:04:09 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gJfU7-0001mE-6K for xen-users@lists.xenproject.org; Mon, 05 Nov 2018 14:04:07 +0000 X-Inumbo-ID: a654da02-e103-11e8-9a16-bc764e045a96 Received: from mail-qk1-x741.google.com (unknown [2607:f8b0:4864:20::741]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id a654da02-e103-11e8-9a16-bc764e045a96; Mon, 05 Nov 2018 14:04:03 +0000 (UTC) Received: by mail-qk1-x741.google.com with SMTP id o89so14839497qko.0 for ; Mon, 05 Nov 2018 06:04:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=webpower.nl; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=/gi8ddrM/R9GNtwwtNYYLTEuA7Bn6vNPZDuZRVKl89A=; b=BU1zNr/zIkf/GgnywqLuLr0t76dQKhaz/66kJEqwcJXQ6voo83zwUZGYwhD0BpGQTI byF33sPtaeOqzsfnlTlwDQ+7JwfeA9+aiRtXZBS/xYV/8NF/8+rMdNZ9VNVxjiS5+8h+ Ou1rWeijDKYdbWn7nscQpO48jY5CXb7MsT3Sk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=/gi8ddrM/R9GNtwwtNYYLTEuA7Bn6vNPZDuZRVKl89A=; b=eR06Rn+mYhUy63LUf9neN5o2N9an2lPRBXV8EnEEqnUzAK2lKupMdG/g9PipRGQ3bH y7OsjwSUxS3yn7jLNm4MVC70phPbxcFCWiJW1+8bMGVhaHilmdg2t3ntsjxWTEwaQXhm T38HbTtBvb2+FhhbO4cP+LJLpo8mxgfm+5Bg70aw5Loe48FlmdNkkSw9wmNcu2bPkiI7 n8WfD09YsXHXkBtObuy8DRSLpfT2mi8VXgMu/MEul6OouxHB2ToDy/H7dQEJLTnxMvt8 pC+KucnKJnrC5zKVqGKcwWsp+aTzY8GuiQZ5XEZyJa6xciLWln3+yYgA351g7DToEPd2 IvSg== X-Gm-Message-State: AGRZ1gIv6uDe2AU8ekoldHyAZ/a/jjBzMg2OSndVF0mitFINdhN/DdnO j6MC90LPdP6xLb6q62LNU/obBSytQZKSbQT0047qKZmPrUU= X-Google-Smtp-Source: AJdET5fXYtsF7Kf24bHKXa1KXTVpMvh8XWSRUGfjWfSfM3Z2DQ6PLNMUvj2f0ZTJf9U2jPqo3h+qxdpgnv/Vb1QchMA= X-Received: by 2002:a0c:81b5:: with SMTP id 50mr21603908qvd.166.1541426642235; Mon, 05 Nov 2018 06:04:02 -0800 (PST) MIME-Version: 1.0 References: <501FA3A3-40E7-482D-B15E-D1BD7A82DAA9@janzen.onl> <0C698F19-82EB-4354-8E07-D33EC5977EAF@janzen.onl> In-Reply-To: From: "Roalt Zijlstra | webpower" Date: Mon, 5 Nov 2018 15:03:51 +0100 Message-ID: To: John Naggets Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-users@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============4291089763282572493==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============4291089763282572493== Content-Type: multipart/alternative; boundary="000000000000754cfd0579eb5beb" --000000000000754cfd0579eb5beb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi John, It could very well be that it is also restricted to some CPUs, but I am inclinded to believe that the used DomU kernels can influence stability. We did have a pretty busy SSL offloader running on a 3.16 kernel, which might have caused the crashes. Just for reference, we have the following two CPUs causing us trouble, but I am not sure if it matters. Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz Roalt Op ma 5 nov. 2018 om 10:45 schreef John Naggets : > Hi, > > Thanks for your feedback. I was wondering because I have just upgraded a > Debian 9 server to the latest kernel with the latest Xen packages from th= e > official Debian repo. The only difference is that I have an older IBM > server which is already ~7 years old patched with the latest BIOS/UEFI an= d > so far so good no crash. The uptime is 6 days for now. Here are the detai= ls > about my kernel and xen packages. > > ii xen-hypervisor-4.8-amd64 > 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Xen Hypervisor on > AMD64 > ii linux-image-4.9.0-8-amd64 > 4.9.110-3+deb9u6 amd64 Linux 4.9 for 64-bi= t > PCs > > Regards, > J. > > > On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen wrote: > >> Hi John, >> >> the problem is that I cannot provide any metrics or logfiles showing an >> error. I can only tell that dom0 is rebooting for a reason that is not >> logged. I have no physical access to the server. I got one other report >> about this kind of issue. >> >> My assumption the cause are the backported patches is based on the >> current 16 day uptime. 16 days ago the server rebooted every 3-5 days. I= t >> won=E2=80=99t be a useful bug report from my point of view. >> >> The other thing is that my two servers are now running upstream Xen and >> kernel and I might not go back to both old versions in Debian stretch. T= he >> other server had always running upstream versions and had never a proble= m, >> that=E2=80=99s why I updated the other, too. >> >> >> Best regards >> Volker >> >> >> Am 02.11.2018 um 17:23 schrieb John Naggets : >> >> I was wondering if any of you guys reported this bug/issue/problem back >> to the Debian community? For example on their bugs.debian org web site? >> >> On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen wrote: >> >>> Hi, >>> >>> I had these crash problems with the Xen version in Debian stretch, too. >>> After 3 to 7 days the Xen server rebooted without log entry or somethin= g >>> else to observe. The problems started when the first patches were appli= ed >>> by Debian. Some updates made it better, the last worse again. I checked >>> hard drives, RAM and closely monitored metrics what might be the cause. >>> >>> My solution after no longer suspecting a hardware fault: build upstream >>> Xen 4.11 for Debian stretch. I am currently running this setup with my = own >>> build of kernel 4.19. The machines are now working stable again. >>> >>> >>> Volker >>> >>> >>> Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower < >>> roalt.zijlstra@webpower.nl>: >>> >>> Hi there, >>> >>> Ever since all the Meltdown and Spectre kernel updates and possibly als= o >>> Xen 4.8 updates, we experience crashes of the Dom0 just out of the blue= . >>> Sometimes after 1 day, sometimes after a few days or even 14 days, >>> completely random. >>> >>> We have two Dell P730 servers and two Dell P720 servers with this >>> behaviour. One thing is that we updated these machine to the latest >>> available firmware, because that is the most secure way. Then we instal= led >>> Debian Stretch with Xen 4.8 support >>> >>> We have done serveral installs and 4 servers seem to crash pretty fast >>> and other don't. In the end we think that we can lead it back to the >>> xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unstable= . >>> This was kinda independent of the kernel that we were using 4.14 or >>> 4.9.0-8-amd64. This is off course all Debian package numbering. >>> >>> As last resort we updated on one server all DomU kernels of our Jessie >>> servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel= . >>> For now that seems to work, but the crashes are random so it could happ= en >>> any time again. The idea is that these kernels are completely spectre& >>> meltdown unaware and might cause trouble in Xen kernel support. I am no= t >>> sure if this is true at all, but we are pretty lost what the actual cau= se >>> is. >>> >>> We also tested with CentOS and we also had these crashes there with >>> certain combinations of kernel/Xen. The most recent updates seem to be = more >>> stable tough. The most frustrating part is the there is absolutely no l= ogs >>> to be found. No kernel oops or what.. the server just resets and boots >>> again. >>> >>> Are there others experiencing problems like this? Do you see more >>> frequent server/kernel crashes on production servers? >>> >>> Best regards, >>> Roalt Zijlstra >>> >>> _______________________________________________ >>> Xen-users mailing list >>> Xen-users@lists.xenproject.org >>> https://lists.xenproject.org/mailman/listinfo/xen-users >>> >>> _______________________________________________ >>> Xen-users mailing list >>> Xen-users@lists.xenproject.org >>> https://lists.xenproject.org/mailman/listinfo/xen-users >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xenproject.org >> https://lists.xenproject.org/mailman/listinfo/xen-users > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xenproject.org > https://lists.xenproject.org/mailman/listinfo/xen-users --000000000000754cfd0579eb5beb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Jo= hn,

It could very well= be that it is also restricted to some CPUs, but I am inclinded to believe = that the used DomU kernels can influence stability.=C2=A0 We did have a pre= tty busy SSL offloader running on a 3.16 kernel, which might have caused th= e crashes.=C2=A0

Just = for reference, we have the following two CPUs causing us trouble, but I am = not sure if it matters.
Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz<= br>
Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz

<= /div>
Roalt
<= /div>

=

Op ma 5 nov. 2018 om = 10:45 schreef John Naggets <= hostingnuggets@gmail.com>:
<= div dir=3D"ltr">
Hi,

Thanks for your feedback. I was wondering because I have just upgr= aded a Debian 9 server to the latest kernel with the latest Xen packages fr= om the official Debian repo. The only difference is that I have an older IB= M server which is already ~7 years old patched with the latest BIOS/UEFI an= d so far so good no crash. The uptime is 6 days for now. Here are the detai= ls about my kernel and xen packages.

ii=C2=A0 xen-= hypervisor-4.8-amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4.8.4+xsa273+shim4= .10.1+xsa273-1+deb9u10 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Xen = Hypervisor on AMD64
ii=C2=A0 linux-image-4.9.0-8-amd64=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 4.9.110-3+deb9u6=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Li= nux 4.9 for 64-bit PCs

Regards,
J.


On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen <volker@janze= n.onl> wrote:
Hi John,

the problem is that I cannot provide any metrics or logfiles showing a= n error. I can only tell that dom0 is rebooting for a reason that is not lo= gged. I have no physical access to the server. I got one other report about= this kind of issue.

My assumption the cause are the backported patches is based on the cur= rent 16 day uptime. 16 days ago the server rebooted every 3-5 days. It won= =E2=80=99t be a useful bug report from my point of view.

The other thing is that my two servers are now running upstream Xen an= d kernel and I might not go back to both old versions in Debian stretch. Th= e other server had always running upstream versions and had never a problem= , that=E2=80=99s why I updated the other, too.


Best regards
=C2=A0=C2=A0 =C2=A0Volker


Am 02.11.2018 um 17:23 schrieb John Naggets <hostingnuggets@gmail.com>:

I was wondering if any of you guys reported this bug/issue= /problem back to the Debian community? For example on their bugs.debian org= web site?

On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen <volker@janzen.onl> w= rote:
Hi,

I had these crash problems with the Xen version in Debian = stretch, too. After 3 to 7 days the Xen server rebooted without log entry o= r something else to observe. The problems started when the first patches we= re applied by Debian. Some updates made it better, the last worse again. I checked hard drives, RAM and close= ly monitored metrics what might be the cause.

My solution after no longer suspecting a hardware fault: b= uild upstream Xen 4.11 for Debian stretch. I am currently running this setu= p with my own build of kernel 4.19. The machines are now working stable aga= in.


=C2=A0=C2=A0 =C2=A0Volker


Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower <roalt.zijlstra@webpower.n= l>:

Hi there,

Ever since all the Meltdown and Spectre kernel updates and possibly also Xe= n 4.8 updates, we experience crashes of the Dom0 just out of the blue. Some= times after 1 day, sometimes after a few days or even 14 days, completely r= andom.

We have two Dell P730 servers and two Dell P720 servers with this behaviour= . One thing is that we updated these machine to the latest available firmwa= re, because that is the most secure way. Then we installed Debian Stretch w= ith Xen 4.8 support

We have done serveral installs and 4 servers seem to crash pretty fast and = other don't. In the end we think that we can lead it back to the xen-4.= 8.4-pre version being stable and the xen-4.8.5-pre being unstable. This was= kinda independent of the kernel that we were using 4.14 or 4.9.0-8-amd64. This is off course all Debian package= numbering.

As last resort=C2=A0 we updated on one server all DomU kernels of our Jessi= e servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. = For now that seems to work, but the crashes are random so it could happen a= ny time again. The idea is that these kernels are completely spectre& meltdown unaware and might cause troub= le in Xen kernel support. I am not sure if this is true at all, but we are = pretty lost what the actual cause is.

We also tested with CentOS and we also had these crashes there with certain= combinations of kernel/Xen. The most recent updates seem to be more stable= tough. The most frustrating part is the there is absolutely no logs to be = found. No kernel oops or what.. the server just resets and boots again.

Are there others experiencing problems like this? Do you see more frequent = server/kernel crashes on production servers?=C2=A0=C2=A0

Best regards,
=C2=A0
Roalt Zijlstra
_______________________________________________
Xen-users mailing list
X= en-users@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
--000000000000754cfd0579eb5beb-- --===============4291089763282572493== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLXVzZXJz IG1haWxpbmcgbGlzdApYZW4tdXNlcnNAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0 cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi11c2Vycw== --===============4291089763282572493==-- From xen-users-bounces@lists.xenproject.org Mon Nov 05 17:25:49 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Mon, 05 Nov 2018 17:25:49 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gJic1-00050r-L9; Mon, 05 Nov 2018 17:24:29 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gJic0-00050k-4x for xen-users@lists.xenproject.org; Mon, 05 Nov 2018 17:24:28 +0000 X-Inumbo-ID: a50cc599-e11f-11e8-9a16-bc764e045a96 Received: from mail-io1-xd43.google.com (unknown [2607:f8b0:4864:20::d43]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id a50cc599-e11f-11e8-9a16-bc764e045a96; Mon, 05 Nov 2018 17:24:26 +0000 (UTC) Received: by mail-io1-xd43.google.com with SMTP id y22-v6so7047847ioj.13 for ; Mon, 05 Nov 2018 09:24:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=X2Zw3NHetYpHHVzQ4uhKOWZEgeFNuvO7Ws2YJzxZlbA=; b=uP5hpnVR+g24FdTh81nJyG/80Q0peLRuGv3VM8lTvguFiYy8ERn9xUHRFkVkEE41Do Xld8TL6Q+1vLblCMWxB+SWI5kTi6b4xSF2U1ZKj4y8qgZH2fvtYtkftM16gRs5hNE8xN I6vmjDGvn20WkjDmxvl9llZ6LBzsqtcoRLY8S1yKTIPeTT270ZXzMBnej76srDRLQDwu eK+NO0DjFuTjtQYY8G3TQK/2ZO3XMPY0jo45G0UmHlSXexRVxJ5OaIIY0uS8FwZh0cIf abTObEyqRg+3BKpdWe+1JIC5li6hYdhLdlEpbriXtWmAsCH/XkZxBWIsBmzJyJR0rt5A xANw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=X2Zw3NHetYpHHVzQ4uhKOWZEgeFNuvO7Ws2YJzxZlbA=; b=g9yVrbeZq6Ezi15KyNaW3E+LSLtqB1Wz8C9u4yY/+kO7Kll/038WsPeKVrXPBEZY06 FxvNmZ2l5TKZodETDOO+P6loVcFuqSoIyZuCKxjW8rz0/q8uhQ93ouQ63P+AfIH4bv88 k64W5X+k0WnR6Pus3JTv9B/Az+lNZdWzVlKFVqlo3XVaS57FRXPEVOcGG4EPUzVyEhpZ sgW4kKLGSNvLckgqEZ6pWQs8z1y6vsB5viGzcAF2nrK/eTGhfm2v4fEESIe24cr/9YhP PPLH5u+NPp/H2j/V9TwnB6yQym00voPToBS+ydpiIgdFbHIs7lChMZVJKTJ6JPlY5sxD 4Tsw== X-Gm-Message-State: AGRZ1gKDtLUP1GQjV9Hc5FAeWDlCCb+OJIFQtClhica62Me5i3IvFD8J 1LVYPLTrN4qlcKobygwRbM4/Bl1En+H0NRk/alUJvcjA X-Google-Smtp-Source: AJdET5eFADqQ8lzJQWYxX7/FoblOgBH00E2XJAQOLqILDqI7Yp2njddhL33vK44xW81Guigkg+CrNIZu3c0nA12ayn4= X-Received: by 2002:a6b:7f0b:: with SMTP id l11-v6mr19387213ioq.221.1541438666096; Mon, 05 Nov 2018 09:24:26 -0800 (PST) MIME-Version: 1.0 References: <501FA3A3-40E7-482D-B15E-D1BD7A82DAA9@janzen.onl> <0C698F19-82EB-4354-8E07-D33EC5977EAF@janzen.onl> In-Reply-To: From: John Naggets Date: Mon, 5 Nov 2018 18:24:12 +0100 Message-ID: To: roalt.zijlstra@webpower.nl Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-users@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============6667818382492414933==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============6667818382492414933== Content-Type: multipart/alternative; boundary="00000000000022c4b00579ee28ba" --00000000000022c4b00579ee28ba Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable It could be as you mention... your domU are they PV? I am using paravirtualization exclusively and on this specific server have the following CPU: Intel(R) Xeon(R) CPU E5645 @ 2.40GHz Do you have the intel-microcode Debian package from the non-free repo installed on your servers? I currently don't... J. On Mon, Nov 5, 2018 at 3:04 PM Roalt Zijlstra | webpower < roalt.zijlstra@webpower.nl> wrote: > Hi John, > > It could very well be that it is also restricted to some CPUs, but I am > inclinded to believe that the used DomU kernels can influence stability. > We did have a pretty busy SSL offloader running on a 3.16 kernel, which > might have caused the crashes. > > Just for reference, we have the following two CPUs causing us trouble, bu= t > I am not sure if it matters. > Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz > Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz > > Roalt > > > Op ma 5 nov. 2018 om 10:45 schreef John Naggets >: > >> Hi, >> >> Thanks for your feedback. I was wondering because I have just upgraded a >> Debian 9 server to the latest kernel with the latest Xen packages from t= he >> official Debian repo. The only difference is that I have an older IBM >> server which is already ~7 years old patched with the latest BIOS/UEFI a= nd >> so far so good no crash. The uptime is 6 days for now. Here are the deta= ils >> about my kernel and xen packages. >> >> ii xen-hypervisor-4.8-amd64 >> 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Xen Hypervisor on >> AMD64 >> ii linux-image-4.9.0-8-amd64 >> 4.9.110-3+deb9u6 amd64 Linux 4.9 for 64-b= it >> PCs >> >> Regards, >> J. >> >> >> On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen wrote: >> >>> Hi John, >>> >>> the problem is that I cannot provide any metrics or logfiles showing an >>> error. I can only tell that dom0 is rebooting for a reason that is not >>> logged. I have no physical access to the server. I got one other report >>> about this kind of issue. >>> >>> My assumption the cause are the backported patches is based on the >>> current 16 day uptime. 16 days ago the server rebooted every 3-5 days. = It >>> won=E2=80=99t be a useful bug report from my point of view. >>> >>> The other thing is that my two servers are now running upstream Xen and >>> kernel and I might not go back to both old versions in Debian stretch. = The >>> other server had always running upstream versions and had never a probl= em, >>> that=E2=80=99s why I updated the other, too. >>> >>> >>> Best regards >>> Volker >>> >>> >>> Am 02.11.2018 um 17:23 schrieb John Naggets : >>> >>> I was wondering if any of you guys reported this bug/issue/problem back >>> to the Debian community? For example on their bugs.debian org web site? >>> >>> On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen wrote: >>> >>>> Hi, >>>> >>>> I had these crash problems with the Xen version in Debian stretch, too= . >>>> After 3 to 7 days the Xen server rebooted without log entry or somethi= ng >>>> else to observe. The problems started when the first patches were appl= ied >>>> by Debian. Some updates made it better, the last worse again. I checke= d >>>> hard drives, RAM and closely monitored metrics what might be the cause= . >>>> >>>> My solution after no longer suspecting a hardware fault: build upstrea= m >>>> Xen 4.11 for Debian stretch. I am currently running this setup with my= own >>>> build of kernel 4.19. The machines are now working stable again. >>>> >>>> >>>> Volker >>>> >>>> >>>> Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower < >>>> roalt.zijlstra@webpower.nl>: >>>> >>>> Hi there, >>>> >>>> Ever since all the Meltdown and Spectre kernel updates and possibly >>>> also Xen 4.8 updates, we experience crashes of the Dom0 just out of th= e >>>> blue. Sometimes after 1 day, sometimes after a few days or even 14 day= s, >>>> completely random. >>>> >>>> We have two Dell P730 servers and two Dell P720 servers with this >>>> behaviour. One thing is that we updated these machine to the latest >>>> available firmware, because that is the most secure way. Then we insta= lled >>>> Debian Stretch with Xen 4.8 support >>>> >>>> We have done serveral installs and 4 servers seem to crash pretty fast >>>> and other don't. In the end we think that we can lead it back to the >>>> xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unstabl= e. >>>> This was kinda independent of the kernel that we were using 4.14 or >>>> 4.9.0-8-amd64. This is off course all Debian package numbering. >>>> >>>> As last resort we updated on one server all DomU kernels of our Jessi= e >>>> servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kerne= l. >>>> For now that seems to work, but the crashes are random so it could hap= pen >>>> any time again. The idea is that these kernels are completely spectre& >>>> meltdown unaware and might cause trouble in Xen kernel support. I am n= ot >>>> sure if this is true at all, but we are pretty lost what the actual ca= use >>>> is. >>>> >>>> We also tested with CentOS and we also had these crashes there with >>>> certain combinations of kernel/Xen. The most recent updates seem to be= more >>>> stable tough. The most frustrating part is the there is absolutely no = logs >>>> to be found. No kernel oops or what.. the server just resets and boots >>>> again. >>>> >>>> Are there others experiencing problems like this? Do you see more >>>> frequent server/kernel crashes on production servers? >>>> >>>> Best regards, >>>> Roalt Zijlstra >>>> >>>> _______________________________________________ >>>> Xen-users mailing list >>>> Xen-users@lists.xenproject.org >>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>>> >>>> _______________________________________________ >>>> Xen-users mailing list >>>> Xen-users@lists.xenproject.org >>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>> >>> _______________________________________________ >>> Xen-users mailing list >>> Xen-users@lists.xenproject.org >>> https://lists.xenproject.org/mailman/listinfo/xen-users >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xenproject.org >> https://lists.xenproject.org/mailman/listinfo/xen-users > > --00000000000022c4b00579ee28ba Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
It could be as you = mention... your domU are they PV? I am using paravirtualization exclusively= and on this specific server have the following CPU:

Intel(R) Xeon(R) CPU=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 E5645=C2=A0 @ 2.40GHz

Do you have the in= tel-microcode Debian package from the non-free repo installed on your serve= rs? I currently don't...

J.
=

On Mon, Nov 5, 2018 at 3:04 PM Roalt Zijlstra | webpower <roalt.zijlstra@webpower.nl> wrote:<= br>
<= div dir=3D"ltr">
Hi John,

It could very well be that it is also restricted to s= ome CPUs, but I am inclinded to believe that the used DomU kernels can infl= uence stability.=C2=A0 We did have a pretty busy SSL offloader running on a= 3.16 kernel, which might have caused the crashes.=C2=A0

Just for reference, we have the followin= g two CPUs causing us trouble, but I am not sure if it matters.
Intel(R)= Xeon(R) CPU E5-2640 0 @ 2.50GHz
Intel(R) Xeon(R) CPU E5-2670= v3 @ 2.30GHz

<= font face=3D"arial, helvetica, sans-serif">Roalt
<= /div>


Op ma 5 nov. 2018 om 10:45 schree= f John Naggets <hostingnuggets@gmail.com>:
Hi,
=
Thanks for your feedback. I was wondering because I have jus= t upgraded a Debian 9 server to the latest kernel with the latest Xen packa= ges from the official Debian repo. The only difference is that I have an ol= der IBM server which is already ~7 years old patched with the latest BIOS/U= EFI and so far so good no crash. The uptime is 6 days for now. Here are the= details about my kernel and xen packages.

ii=C2= =A0 xen-hypervisor-4.8-amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4.8.4+xsa2= 73+shim4.10.1+xsa273-1+deb9u10 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 Xen Hypervisor on AMD64
ii=C2=A0 linux-image-4.9.0-8-amd64=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 4.9.110-3+deb9u6=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 Linux 4.9 for 64-bit PCs

Regards,
=
J.


On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen <vol= ker@janzen.onl> wrote:
Hi John,

the problem is that I cannot provide any metrics or logfiles showing a= n error. I can only tell that dom0 is rebooting for a reason that is not lo= gged. I have no physical access to the server. I got one other report about= this kind of issue.

My assumption the cause are the backported patches is based on the cur= rent 16 day uptime. 16 days ago the server rebooted every 3-5 days. It won= =E2=80=99t be a useful bug report from my point of view.

The other thing is that my two servers are now running upstream Xen an= d kernel and I might not go back to both old versions in Debian stretch. Th= e other server had always running upstream versions and had never a problem= , that=E2=80=99s why I updated the other, too.


Best regards
=C2=A0=C2=A0 =C2=A0Volker


Am 02.11.2018 um 17:23 schrieb John Naggets <hostingnuggets@gmail.com>:

I was wondering if any of you guys reported this bug/issue= /problem back to the Debian community? For example on their bugs.debian org= web site?

On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen <volker@janzen.onl> w= rote:
Hi,

I had these crash problems with the Xen version in Debian = stretch, too. After 3 to 7 days the Xen server rebooted without log entry o= r something else to observe. The problems started when the first patches we= re applied by Debian. Some updates made it better, the last worse again. I checked hard drives, RAM and close= ly monitored metrics what might be the cause.

My solution after no longer suspecting a hardware fault: b= uild upstream Xen 4.11 for Debian stretch. I am currently running this setu= p with my own build of kernel 4.19. The machines are now working stable aga= in.


=C2=A0=C2=A0 =C2=A0Volker


Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower <roalt.zijlstra@webpower.n= l>:

Hi there,

Ever since all the Meltdown and Spectre kernel updates and possibly also Xe= n 4.8 updates, we experience crashes of the Dom0 just out of the blue. Some= times after 1 day, sometimes after a few days or even 14 days, completely r= andom.

We have two Dell P730 servers and two Dell P720 servers with this behaviour= . One thing is that we updated these machine to the latest available firmwa= re, because that is the most secure way. Then we installed Debian Stretch w= ith Xen 4.8 support

We have done serveral installs and 4 servers seem to crash pretty fast and = other don't. In the end we think that we can lead it back to the xen-4.= 8.4-pre version being stable and the xen-4.8.5-pre being unstable. This was= kinda independent of the kernel that we were using 4.14 or 4.9.0-8-amd64. This is off course all Debian package= numbering.

As last resort=C2=A0 we updated on one server all DomU kernels of our Jessi= e servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. = For now that seems to work, but the crashes are random so it could happen a= ny time again. The idea is that these kernels are completely spectre& meltdown unaware and might cause troub= le in Xen kernel support. I am not sure if this is true at all, but we are = pretty lost what the actual cause is.

We also tested with CentOS and we also had these crashes there with certain= combinations of kernel/Xen. The most recent updates seem to be more stable= tough. The most frustrating part is the there is absolutely no logs to be = found. No kernel oops or what.. the server just resets and boots again.

Are there others experiencing problems like this? Do you see more frequent = server/kernel crashes on production servers?=C2=A0=C2=A0

Best regards,
=C2=A0
Roalt Zijlstra
_______________________________________________
Xen-users mailing list
X= en-users@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
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+0000 X-Inumbo-ID: 5734c17d-e134-11e8-9a16-bc764e045a96 Received: from EUR04-DB3-obe.outbound.protection.outlook.com (unknown [2a01:111:f400:fe0c::624]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id 5734c17d-e134-11e8-9a16-bc764e045a96; Mon, 05 Nov 2018 19:52:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vjanzen.onmicrosoft.com; s=selector1-janzen-onl; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=J08o1NwlOk9uSoLVdw1Lkjth+3n1SBwkaXORGeWWl7c=; b=SPGoTyuxkHsV0GmwPFsJvqemoBZD6SSqKLNm4mc6hfOOBLtQeoaMi6JBdfV0ajXgsYxQZ1R1KE4Fk/ZCcFZr4kftqQMqBGTd4/ELQomFtkyIQ0gO8HFRIS8jkhVmMWtvEXFieEkNlqATARJLltK9r8lnBN8stODlprnw+oaWAZ0= Received: from AM4PR0101MB2194.eurprd01.prod.exchangelabs.com (10.165.23.23) by AM4PR0101MB2164.eurprd01.prod.exchangelabs.com (10.165.23.17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1294.21; Mon, 5 Nov 2018 19:52:33 +0000 Received: from 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SitPE5hMQwb4b5DIJdu/AZINkyt6e9hCE9mVdYVGJX50L/7dG8DeEjh/mV4wtoaoWMS5QV+rdRDajiTTktFP4ldSKbopRAGLCQFc5p4zXSAL0avHgh40F9m+0uPJVdKUrQgHb3XvslkDk419HgFal9ffzRpDa0nck/WQq9oG92OBwT1IuLI7A8l2d3NoGF1MJccF+AsmZw67iRLs0TXez5PxUFwdGhUHiD+f/sICzkfQOPadCGvNuBkAgiyLNfRKZA3qXbkWnRj8SjEQ97xqO1FqTr6hgmZc6jNV3ZL33kxdw+VxlhORkANf8CePWKXHHX0493E5JbJ1SAP9L2CQSvEAJ3gaQWFd5zNJWOhs1B4= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-OriginatorOrg: janzen.onl X-MS-Exchange-CrossTenant-Network-Message-Id: a21761d8-a411-4c9e-6ca6-08d643583a88 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Nov 2018 19:52:33.6924 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f7b6e54d-697a-4eeb-b855-9e6b06fe6e85 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR0101MB2164 Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list 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[2607:f8b0:4864:20::842]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id 3ace797b-e19f-11e8-9a16-bc764e045a96; Tue, 06 Nov 2018 08:37:44 +0000 (UTC) Received: by mail-qt1-x842.google.com with SMTP id g10-v6so1683510qtq.6 for ; Tue, 06 Nov 2018 00:37:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=webpower.nl; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=2uh+G5CXBCAJLdVgCKNKDnysIy/iWH0grKFuz83oDg0=; b=S4K812mRrAYE56OxJQ0Ca3goedVz9CaSED7sKVyKqhZOR/FuY8SaLHAMns9l8jcrIz 8f7UG7ADv0IB0d74G/1mM6qdulLUGmp7qfnKBNikqWz3tuluFBnTWG37qhxbYM4i9nQm LBG6petZmUKslyLVuk9RvT4hF0oELWe0vIavM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=2uh+G5CXBCAJLdVgCKNKDnysIy/iWH0grKFuz83oDg0=; b=mMM+OaolLXtfEHUGMSUodDodl/kpHrVjuPrshtXWZn/9my56ZM5ZcwMqDeA8305JfP 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xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-users@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============0145610074225674724==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============0145610074225674724== Content-Type: multipart/alternative; boundary="0000000000004e24920579faeae7" --0000000000004e24920579faeae7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi John, Yes, we are using PV only and we only run Debian Linux on the servers. We still have some DomU Jessie servers running with the stock kernel. We did update our Dells to the latest firmware so it does include more recent intel microcode with that. But on Debian we did not yet enable the intel-firmware yet, since we had so much instability and so much parameters that could be the culprit, we did not want to add another. If your server is very busy, I think the chance to have a crash is higher. We have seen crashes on our active MySQL databases whereas the slave MySQL database server did not crash that quickly, however after using the slave MySQL database as primary database for a while (because we were debugging the crashed master database) it could very well happen that the slave would crash too. We have done tests with downgrading firmware of Dell (which also means using an older intel microcode) but that did not help. So having the latest firmware is okay. We are now testing a few scenarios: - one server with an older kernel (4.9.0-4-amd64), with DomU 3.16 kernel, which runs for 16 days now - one server with the updated -kernel (4.9.0-8-amd64), with DomU 3.16 kernel, which runs for 28 days now surprisingly - one server with the updated -kernel (4.9.0-8-amd64), and all DomUs on the backported 4.9 kernel. It all doesn't really make much sense. We do have the expectation that the older kernel will keep on running and that the 4.9 DomUs will help to keep the servers alive. We have tested with 4.14 and 4.16 kernels (from backports) but that did not make a difference in stability. Best regards, Roalt Zijlstra Teamleader Infra & Deliverability roalt.zijlstra@webpower.nl +31 342 423 262 roalt.zijlstra https://www.webpower-group.com [image: Facebook] [image: Twitter] [image: Linkedin] Barcelona | Barneveld | Beijing | Chengdu | Guangzhou Hamburg | Shanghai | Shenzhen | Stockholm Op ma 5 nov. 2018 om 18:24 schreef John Naggets : > It could be as you mention... your domU are they PV? I am using > paravirtualization exclusively and on this specific server have the > following CPU: > > Intel(R) Xeon(R) CPU E5645 @ 2.40GHz > > Do you have the intel-microcode Debian package from the non-free repo > installed on your servers? I currently don't... > > J. > > > On Mon, Nov 5, 2018 at 3:04 PM Roalt Zijlstra | webpower < > roalt.zijlstra@webpower.nl> wrote: > >> Hi John, >> >> It could very well be that it is also restricted to some CPUs, but I am >> inclinded to believe that the used DomU kernels can influence stability. >> We did have a pretty busy SSL offloader running on a 3.16 kernel, which >> might have caused the crashes. >> >> Just for reference, we have the following two CPUs causing us trouble, >> but I am not sure if it matters. >> Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz >> Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz >> >> Roalt >> >> >> Op ma 5 nov. 2018 om 10:45 schreef John Naggets > >: >> >>> Hi, >>> >>> Thanks for your feedback. I was wondering because I have just upgraded = a >>> Debian 9 server to the latest kernel with the latest Xen packages from = the >>> official Debian repo. The only difference is that I have an older IBM >>> server which is already ~7 years old patched with the latest BIOS/UEFI = and >>> so far so good no crash. The uptime is 6 days for now. Here are the det= ails >>> about my kernel and xen packages. >>> >>> ii xen-hypervisor-4.8-amd64 >>> 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Xen Hypervisor on >>> AMD64 >>> ii linux-image-4.9.0-8-amd64 >>> 4.9.110-3+deb9u6 amd64 Linux 4.9 for 64-= bit >>> PCs >>> >>> Regards, >>> J. >>> >>> >>> On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen wrote: >>> >>>> Hi John, >>>> >>>> the problem is that I cannot provide any metrics or logfiles showing a= n >>>> error. I can only tell that dom0 is rebooting for a reason that is not >>>> logged. I have no physical access to the server. I got one other repor= t >>>> about this kind of issue. >>>> >>>> My assumption the cause are the backported patches is based on the >>>> current 16 day uptime. 16 days ago the server rebooted every 3-5 days.= It >>>> won=E2=80=99t be a useful bug report from my point of view. >>>> >>>> The other thing is that my two servers are now running upstream Xen an= d >>>> kernel and I might not go back to both old versions in Debian stretch.= The >>>> other server had always running upstream versions and had never a prob= lem, >>>> that=E2=80=99s why I updated the other, too. >>>> >>>> >>>> Best regards >>>> Volker >>>> >>>> >>>> Am 02.11.2018 um 17:23 schrieb John Naggets = : >>>> >>>> I was wondering if any of you guys reported this bug/issue/problem bac= k >>>> to the Debian community? For example on their bugs.debian org web site= ? >>>> >>>> On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen wrote= : >>>> >>>>> Hi, >>>>> >>>>> I had these crash problems with the Xen version in Debian stretch, >>>>> too. After 3 to 7 days the Xen server rebooted without log entry or >>>>> something else to observe. The problems started when the first patche= s were >>>>> applied by Debian. Some updates made it better, the last worse again.= I >>>>> checked hard drives, RAM and closely monitored metrics what might be = the >>>>> cause. >>>>> >>>>> My solution after no longer suspecting a hardware fault: build >>>>> upstream Xen 4.11 for Debian stretch. I am currently running this set= up >>>>> with my own build of kernel 4.19. The machines are now working stable= again. >>>>> >>>>> >>>>> Volker >>>>> >>>>> >>>>> Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower < >>>>> roalt.zijlstra@webpower.nl>: >>>>> >>>>> Hi there, >>>>> >>>>> Ever since all the Meltdown and Spectre kernel updates and possibly >>>>> also Xen 4.8 updates, we experience crashes of the Dom0 just out of t= he >>>>> blue. Sometimes after 1 day, sometimes after a few days or even 14 da= ys, >>>>> completely random. >>>>> >>>>> We have two Dell P730 servers and two Dell P720 servers with this >>>>> behaviour. One thing is that we updated these machine to the latest >>>>> available firmware, because that is the most secure way. Then we inst= alled >>>>> Debian Stretch with Xen 4.8 support >>>>> >>>>> We have done serveral installs and 4 servers seem to crash pretty fas= t >>>>> and other don't. In the end we think that we can lead it back to the >>>>> xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unstab= le. >>>>> This was kinda independent of the kernel that we were using 4.14 or >>>>> 4.9.0-8-amd64. This is off course all Debian package numbering. >>>>> >>>>> As last resort we updated on one server all DomU kernels of our >>>>> Jessie servers on this Dom0 to 4.9.0 from backports instead of the 3.= 16 >>>>> kernel. For now that seems to work, but the crashes are random so it = could >>>>> happen any time again. The idea is that these kernels are completely >>>>> spectre& meltdown unaware and might cause trouble in Xen kernel suppo= rt. I >>>>> am not sure if this is true at all, but we are pretty lost what the a= ctual >>>>> cause is. >>>>> >>>>> We also tested with CentOS and we also had these crashes there with >>>>> certain combinations of kernel/Xen. The most recent updates seem to b= e more >>>>> stable tough. The most frustrating part is the there is absolutely no= logs >>>>> to be found. No kernel oops or what.. the server just resets and boot= s >>>>> again. >>>>> >>>>> Are there others experiencing problems like this? Do you see more >>>>> frequent server/kernel crashes on production servers? >>>>> >>>>> Best regards, >>>>> Roalt Zijlstra >>>>> >>>>> _______________________________________________ >>>>> Xen-users mailing list >>>>> Xen-users@lists.xenproject.org >>>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>>>> >>>>> _______________________________________________ >>>>> Xen-users mailing list >>>>> Xen-users@lists.xenproject.org >>>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>>> >>>> _______________________________________________ >>>> Xen-users mailing list >>>> Xen-users@lists.xenproject.org >>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>> >>> _______________________________________________ >>> Xen-users mailing list >>> Xen-users@lists.xenproject.org >>> https://lists.xenproject.org/mailman/listinfo/xen-users >> >> --0000000000004e24920579faeae7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Jo= hn,

Yes, we are using = PV only and we only run Debian Linux on the servers. We still have some Dom= U Jessie servers running with the stock kernel. We did update our Dells to = the latest firmware so it does include more recent intel microcode with tha= t. But on Debian we did not yet enable the intel-firmware yet, since we had= so much instability and so much parameters that could be the culprit, we d= id not want to add another.
If your server is very = busy, I think the chance to have a crash is higher. We have seen crashes on= our active MySQL databases whereas the slave MySQL database server did not= crash that quickly, however after using the slave MySQL database as primar= y database for a while (because we were debugging the crashed master databa= se) it could very well happen that the slave would crash too.

We have done tests with downgrading= firmware of Dell (which also means using an older intel microcode) but tha= t did not help. So having the latest firmware is okay.=C2=A0
We are now testing a few scenarios:
    <= li>=C2=A0one server with an older kernel (4.9.0-4-amd64), with DomU 3.16 ke= rnel, which runs for 16 days now
  • =C2=A0one server with the upda= ted -kernel (4.9.0-8-amd64), with DomU 3.16 kernel, which runs for 28 days = now surprisingly
  • =C2=A0one server with=C2=A0the updated -kernel= (4.9.0-8-amd64),=C2=A0and all DomUs on the backported 4.9 kernel.
It all doesn't really make much sense. We do = have the expectation that the older kernel will keep on running and that th= e 4.9 DomUs will help to keep the servers alive.=C2=A0
We have tested with 4.14 and 4.16 kernels (from backports) but that did= not make a difference in stability.

=
Best= regards,
=C2=A0
=C2=A0= Roalt Zijlstra
=C2=A0=C2=A0Teamleader Infra & Deliverability
=C2=A0=C2=A0=C2=A0
=C2=A0roalt.zijlstra@webpower.nl
=C2=A0+31 342 423 262
=C2=A0roalt.zijlstra
=C2=A0https://www.webpower-group.com
= =C2=A0
=C2=A0
3D"Facebook"=C2=A03D"T==C2=A03D"Linkedin"
<= td valign=3D"top" align=3D"left" width=3D"5">=
Barcelona | Barneveld | Beijing | Chengdu | Guangzhou
Hamburg= | Shanghai | Shenzhen | Stockholm		=C2=A0
=


Op ma 5 nov. 2018 om 18:24 schreef John Naggets &l= t;hostingnuggets@gmail.com&= gt;:
It could be as you mention... your domU are they = PV? I am using paravirtualization exclusively and on this specific server h= ave the following CPU:

Intel(R) Xeon(R) CPU=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 E5645=C2=A0 @ 2.40GH= z

Do you have the intel-microcode Debian package f= rom the non-free repo installed on your servers? I currently don't...

J.

On Mon, Nov 5, 2018 at 3:04 P= M Roalt Zijlstra | webpower <roalt.zijlstra@webpower.nl> wrote:
Hi John,

It could very well be that it is also restricted to some CPUs, bu= t I am inclinded to believe that the used DomU kernels can influence stabil= ity.=C2=A0 We did have a pretty busy SSL offloader running on a 3.16 kernel= , which might have caused the crashes.=C2=A0

Just for reference, we have the following two CPUs c= ausing us trouble, but I am not sure if it matters.
Intel(R) Xeon(R) CPU= E5-2640 0 @ 2.50GHz
Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GH= z

Roalt


Op ma 5 nov. 2018 om 10= :45 schreef John Naggets <hostingnuggets@gmail.com>:
Hi,<= /div>

Thanks for your feedback. I was wondering because = I have just upgraded a Debian 9 server to the latest kernel with the latest= Xen packages from the official Debian repo. The only difference is that I = have an older IBM server which is already ~7 years old patched with the lat= est BIOS/UEFI and so far so good no crash. The uptime is 6 days for now. He= re are the details about my kernel and xen packages.

ii=C2=A0 xen-hypervisor-4.8-amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4.= 8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Xen Hypervisor on AMD64
ii=C2=A0 linux-image-4.9.0-8-amd64= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4.9.110-3+deb9u6=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 Linux 4.9 for 64-bit PCs

Regar= ds,
J.


On Fri, Nov 2, 2018 at 7:57 PM Volker Jan= zen <volker@janzen.onl> wrote:
Hi John,

the problem is that I cannot provide any metrics or logfiles showing a= n error. I can only tell that dom0 is rebooting for a reason that is not lo= gged. I have no physical access to the server. I got one other report about= this kind of issue.

My assumption the cause are the backported patches is based on the cur= rent 16 day uptime. 16 days ago the server rebooted every 3-5 days. It won= =E2=80=99t be a useful bug report from my point of view.

The other thing is that my two servers are now running upstream Xen an= d kernel and I might not go back to both old versions in Debian stretch. Th= e other server had always running upstream versions and had never a problem= , that=E2=80=99s why I updated the other, too.


Best regards
=C2=A0=C2=A0 =C2=A0Volker


Am 02.11.2018 um 17:23 schrieb John Naggets <hostingnuggets@gmail.com>:

I was wondering if any of you guys reported this bug/issue= /problem back to the Debian community? For example on their bugs.debian org= web site?

On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen <volker@janzen.onl> w= rote:
Hi,

I had these crash problems with the Xen version in Debian = stretch, too. After 3 to 7 days the Xen server rebooted without log entry o= r something else to observe. The problems started when the first patches we= re applied by Debian. Some updates made it better, the last worse again. I checked hard drives, RAM and close= ly monitored metrics what might be the cause.

My solution after no longer suspecting a hardware fault: b= uild upstream Xen 4.11 for Debian stretch. I am currently running this setu= p with my own build of kernel 4.19. The machines are now working stable aga= in.


=C2=A0=C2=A0 =C2=A0Volker


Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower <roalt.zijlstra@webpower.n= l>:

Hi there,

Ever since all the Meltdown and Spectre kernel updates and possibly also Xe= n 4.8 updates, we experience crashes of the Dom0 just out of the blue. Some= times after 1 day, sometimes after a few days or even 14 days, completely r= andom.

We have two Dell P730 servers and two Dell P720 servers with this behaviour= . One thing is that we updated these machine to the latest available firmwa= re, because that is the most secure way. Then we installed Debian Stretch w= ith Xen 4.8 support

We have done serveral installs and 4 servers seem to crash pretty fast and = other don't. In the end we think that we can lead it back to the xen-4.= 8.4-pre version being stable and the xen-4.8.5-pre being unstable. This was= kinda independent of the kernel that we were using 4.14 or 4.9.0-8-amd64. This is off course all Debian package= numbering.

As last resort=C2=A0 we updated on one server all DomU kernels of our Jessi= e servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. = For now that seems to work, but the crashes are random so it could happen a= ny time again. The idea is that these kernels are completely spectre& meltdown unaware and might cause troub= le in Xen kernel support. I am not sure if this is true at all, but we are = pretty lost what the actual cause is.

We also tested with CentOS and we also had these crashes there with certain= combinations of kernel/Xen. The most recent updates seem to be more stable= tough. The most frustrating part is the there is absolutely no logs to be = found. No kernel oops or what.. the server just resets and boots again.

Are there others experiencing problems like this? Do you see more frequent = server/kernel crashes on production servers?=C2=A0=C2=A0

Best regards,
=C2=A0
Roalt Zijlstra
_______________________________________________
Xen-users mailing list
X= en-users@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
_______________________________________________
Xen-users mailing list
Xen-use= rs@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo= /xen-users
_______________________________________________
Xen-users mailing list
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https://lists.xenproject.org/mailman/listinfo= /xen-users
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Tue, 06 Nov 2018 09:08:03 +0000 (UTC) Received: from [192.168.10.7] ([24.134.99.177]) by mail.gmx.com (mrgmx002 [212.227.17.190]) with ESMTPSA (Nemesis) id 0LzKyn-1fOZJg137x-014WSw for ; Tue, 06 Nov 2018 10:08:01 +0100 Received: from [192.168.10.7] ([24.134.99.177]) by mail.gmx.com (mrgmx002 [212.227.17.190]) with ESMTPSA (Nemesis) id 0LzKyn-1fOZJg137x-014WSw for ; Tue, 06 Nov 2018 10:08:01 +0100 To: xen-users@lists.xenproject.org References: <501FA3A3-40E7-482D-B15E-D1BD7A82DAA9@janzen.onl> <0C698F19-82EB-4354-8E07-D33EC5977EAF@janzen.onl> From: Michael Openpgp: preference=signencrypt Autocrypt: addr=mjs@cephei.com; keydata= xsFNBFRPcX4BEACx8zwNH8NYu57EJS81DMf2JG9t90gu4M3ovbGjj86SQt7j0qw02aVIIOw+ w3++9wv9Wgi/2XahKWRoEaablILwE1jlo2sGeNSmRTbOB6uUYsO8b9gTjgGKYsMK1wg1DEM1 5wQExCs6nTTMkwDekPrclRPmDFBN1SEUXlGSR/u3meMovsJRZD0Iy/apAEaBf7XJgGNGQMht mVsO4jS/X/0p7q3njRFgo9KZL0OCqRUDRcENI07lJY3HILY0wLKbAxnj80Cvz/EYSq/jSjYB YfQ3YA3FIXx0POEfNLEvXctEqXanfNkFLRki5LHd1RTNjRXynu6IHzDtAC4VwhjoUA9JFVZj g2qp0SDGXIA4b3rWlxtfUMdYVfr4z46h7AH0nWsxfCaoLSCwvE0u9UgQq+ZbaSNDXz+tsbFs oYY2qWdvGPPwWXh2R3i0t93SElKrZVHt9OhUCRJKfQKiuGoaigLDN/asyS0bqfw0olNUcsF2 ai00WHUIzKO15nyuObHlJ0747Oork7+Xn9vk9nARB4IYSFgRwD3Ruiur1K8ZhDWRYENd6uQ1 qZ5S2Q3NNJyH3LWrqjdMraxtp9okVuPccrBurzSK1aqzS2XukHYR0Lzt5jeAvQG5l3FsyEXj hNVJBo242mMp9UKEUjqDVTXxTEUCiqwWsZLRC9ouGcIJxHPb4QARAQABzSFNaWNoYWVsIFN0 aWVnbGVyIDxtanNAY2VwaGVpLmNvbT7CwZYEEwEIAEACGyMHCwkIBwMCAQYVCAIJCgsEFgID AQIeAQIXgBYhBP6kJTifkSbfbn6+g1772gvxRt6VBQJbj3azBQllPBQ1AAoJEF772gvxRt6V DwEQAItTtMOUDQvQrB0hp0gbMpdaph50pFGSuQlneMl+5oQlVXkHRR8CcQAhDppQ7Yda7a1U 2s2z/QStzhJuiYlw94rSXKVbUwXYdOAKDqjLclJDn72+hHHkEmRYmUZ1zLprsTjV/EuuhnQO BXEumj17xenav3yMwH41eN67TIvLOfvt18a+ZpF4q2CaoVQ5Lqmcszr1I9NIrHqkkKG/+n1V GV3qEIWR11/WCNLyvUscyApLdWRTBMftRaMnFrkZ/kYpea9KymUYr7VhjLGqaPdWf6zQ4Qa7 3MDVxICPU4NqryspeGh5gPRX5t4CDDx9QqzEXrNuYDd0rnG96XIzVWZ7TDctmP9eLfmpHCzI DASM1Ubnf0HmCC0TE7Z+8a7y+Fti3Eu8I+4bHkcTDNLEf/lCVIUO0SScVERy1YJJFNWKq2+8 lq+JY4bX/kTRw8zEMXe4VmzXZ9SQ0FpCfrJM8kdRJP+ujHmojM36TqEGYGuufo4MQTC4X027 WLoUxn/0tMWMYICcnjnMYDN1uFwcYaPQ2KLyMXiVOcueL/Pv9m7FwtW2YJl4HfQHzfoc/ki6 hb5pd43Lxo0QEiqaJ/xWSN84IhaMrGWig9nsZJv1BBKr+2w0n0pBCcdBudan9ErUkNq9Sfke ml5Cm+sCFp+HVfzAGCfEtza28dZPHZhzcOoSg+thzsFNBFRPcX4BEAC1FIhNiNvlx8+Pc69X eh2jHumTosiu5D5Li+PaxbazerxaqYPZe6z5f39iFDQycLKCOauDyybAMmydmVztUrLBCag+ SPr2yWQaEJIaOwdSqPlBv0zJHrEu7vIZ+9i6C3cIiXSrfBVxEaAiurhl7WWpVaSxO7t7ya1B RsKSOY6yttRsAMCm5Tu8GyNoRCbh3+7qIyaYwVpbJETgowgZU68u9TOMnkG1fE0BlJb7qbCh fcXLJqBmj7R3xfCVMhXmyQ8PxXLUKwQKguGej46QzQlRjeQYABMRUkWPg//h3QfJlQmUW97k FAyV9gNwP+FsCfKx0mTON+iGheiV/0W3PQZ3+3J/i7LxtqixGrw0aPNXymvmxYOmBeNBTk0V 13IhcZXyW/r+E8lT6SYPx4PGSRNhahYns0TsE1TMTlNgjz7PibpBopOq0RnPs4cRnMCdt/Cs H9VW3TQMvZR6CgCk502YvPn7G82lDXLntU/fHxDksT3XRl+aWtluaLKNHjnRx8MRUn3QU9kL lAVzoROpWIKhdsM/BckXran/+DY/A30n8z3OUaEy3RZpadDZGJEuF+FoOYs+UDlq+YKBQt4Z 8gCUnx41KuVp9JxupyXMaK2uROzNF8KAZ4dRkzB/B42gHlmfKBb0pz9xkpX7xoBtihzcFeqx wsUPRTne/PMnZxgLXwARAQABwsF8BBgBCAAmAhsMFiEE/qQlOJ+RJt9ufr6DXvvaC/FG3pUF AluPdrMFCWU8FDUACgkQXvvaC/FG3pVExg//ZTy+3kGrhWPfKa96i4ET3PcG84PjcZZVNhPQ Crp253GJWw4sUk+6O94Z0IUdtUSrQHvxdkkQn8FCFP6SZaZVjpd/bcfO6FSc6xoMK9YRHPl7 PYa20uUzXnldJCXYdGXCiBWAj0igTdTFaAbNIruHE7lwIUq2lMwtBzLH5nJqPgxCEcWFRtg4 aDwtyLncrNXLVx8zXDlVhsaafU3O8bMJOzr20otFf2LGBWy1w+PaA5io3/4YOkhcLZj36a6T /M3BXjRfSLHYyg7xgTUvhx47LK0Fxb4T4oM6e+dPTqQO0HPFYJubpUH3Fy717SptFVlrTG5O FFHkGMYu4D7AMwflIRMEMiuR3cuMkYnW65kz8W7aWinuqEwwuB+NCda5r/Cct7eBTvoO9avi a1DlRMlDmhuoV2diReiDPy+GZdPAh4CTNhmGh3oohVLYmGlC9vmUR7lFpJxLFIEpJXGgqvRI ZCQwH4BD2vSlvvi0OpCmBGt0X7LP0qREqS1Bkpk/egGIod7gNIlEeXfuSEdOtqqgQzYqmGm5 Pk1DKdaFpen1AJgVOFghgL9k/aq9ZNtymk7MXlk2PJv0W3rcbb2tEgHIM7R4MbPGDIfLR79n zrIrgTrNPBWM5q0inWGNwUfDag6mn9U1Ou5k2vrXGmUggQJA/8HEDqPsZy85Vx6uyaws94A= Message-ID: <02b0d310-e0ba-02c2-e839-bea736cef65c@gmx.de> Date: Tue, 6 Nov 2018 10:08:02 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-GB X-Provags-ID: V03:K1:xuphMSagSCDvcZEw4XAHjkkYxzgvFEzn03HcDASui/CYmNb+59v FgmGrAVYIEaISm7MCgEAstXn71/0o3h+SdLP3/O15TTkl/tYy/hzh+eNd+NyLeGdZT8rUjk tCbddnyfBDITGxg44VSuz1WqXSqinSvdUxSG9O3SXRo5CMTi2Bxs8R+1ywC+nEBKD7IZcLD nTwWREWuRYNsjg9smF0/g== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V01:K0:JE2oPmltlrA=:NYHpJ/BViFXpVB6xjgOQTH XL4FYyFzyOBD98RmFhNgC64+j3T4SCiYHxLr8O4hX78xAYGbMv08VQ+WFhvCVth4SvWaoBsIJ MnJy4NRkQmIZLKBmOkjnHLOWV22z+yfwEmnvZDKdVsATcT+lbnz9pPadfqhvFo8mRZecKlKSZ 4RWftjhxbjKadSyr0WInw/UZS634sX302I7CgfdKwHKtJRCAaahsbZC+9rTeWyzzsUkK4E+/L n/tAFmtPc0cG0RWHogP8OfS4YQIknELIq/0dwz5spEZ4MKasbLm2ztriEBIPQdUIV3S/It/N7 31644Fvjv3dL7ApCcatgG2aGaN+uyDQdCguCRYP4JJcUlI7R+sgZcUuoNk4MBwz7NRehaKpOw o0xDpaH3H3aNVXvEtE2II+/gYDoTnH36Gvx8kazl83ldhW/VGYT1dk9zoIfbM8OUEQ7XinC1t Vo4T532QcJHQqhChEuc/7UybZKWLxbyzUwrDo0eoSA8OagQohF1fRop5jtwjvOm/1BGKP4jjn RY7j0QbyX+ENCpYGuLx9tBRtiy0BQfuwtyhsVD0cyE65bikMCSzV6rrFLGsynXWgo4+6E0n9t EYf4Ch51uRH55//s8mtLH2fMoU6qycMBq/ssLy+HVmKtB5eoUXDi1JnsE5wHfYhBZHbWgc40v W4FUHJgAuvsDp426mm3OWpWLJjU+RLUT0ebdS6dUQYZZkCgmmbuJujtYaTCjnCHzSZzmKITSY R88bq2iOBdB4hKvGAJ9fGON5wl6kKemoKM8Cb7Y2CeUHkebVmUFSFm4PyhuF2vZSlgi5/DfoH b1zzseYe92uZIBQqcyfWCwSsaX0nvuLME2aMn7cHvcdqnUTfuM= Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============6955539779452206244==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" This is a multi-part message in MIME format. --===============6955539779452206244== Content-Type: multipart/alternative; boundary="------------CBE151FCEECCE17BEA3FA1AE" Content-Language: en-GB This is a multi-part message in MIME format. --------------CBE151FCEECCE17BEA3FA1AE Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hello, i had the same Issues. In my case i tried Ubuntu 18.04 with xen 4.9 and the Kernel Version 4.15.9 was the only one wo has start up the DomU. Tested on AMD Ryzen 1800X and Intel 8700. In my case i got random system freezes Uptimes between 7 and 30 Days. Older and never Kernels wont run. This Problem is still present, i going to switch all Services to Docker..= =2E Regards, Michael Am 06.11.2018 um 09:37 schrieb Roalt Zijlstra | webpower: > Hi John, > > Yes, we are using PV only and we only run Debian Linux on the servers. > We still have some DomU Jessie servers running with the stock kernel. > We did update our Dells to the latest firmware so it does include more > recent intel microcode with that. But on Debian we did not yet enable > the intel-firmware yet, since we had so much instability and so much > parameters that could be the culprit, we did not want to add another. > If your server is very busy, I think the chance to have a crash is > higher. We have seen crashes on our active MySQL databases whereas the > slave MySQL database server did not crash that quickly, however after > using the slave MySQL database as primary database for a while > (because we were debugging the crashed master database) it could very > well happen that the slave would crash too. > > We have done tests with downgrading firmware of Dell (which also means > using an older intel microcode) but that did not help. So having the > latest firmware is okay.=A0 > We are now testing a few scenarios: > > * =A0one server with an older kernel (4.9.0-4-amd64), with DomU 3.16 > kernel, which runs for 16 days now > * =A0one server with the updated -kernel (4.9.0-8-amd64), with DomU > 3.16 kernel, which runs for 28 days now surprisingly > * =A0one server with=A0the updated -kernel (4.9.0-8-amd64),=A0and all= > DomUs on the backported 4.9 kernel. > > It all doesn't really make much sense. We do have the expectation that > the older kernel will keep on running and that the 4.9 DomUs will help > to keep the servers alive.=A0 > We have tested with 4.14 and 4.16 kernels (from backports) but that > did not make a difference in stability. > > Best regards, > =A0 > > [Naam] =A0 Roalt Zijlstra > =A0 =A0 Teamleader Infra & Deliverability > =A0 =A0 =A0 > [Email] =A0 roalt.zijlstra@webpower.nl > > [Phone] =A0 +31 342 423 262 > [Skype] =A0 roalt.zijlstra > [Phone] =A0 https://www.webpower-group.com > > =A0 =09 > =09 > > [Webpower] > =A0 > Facebook =A0 > Twitter =A0 Linkedin > > > > Barcelona | Barneveld | Beijing | Chengdu | Guangzhou > Hamburg | Shanghai | Shenzhen | Stockholm =A0 > > > > > > > Op ma 5 nov. 2018 om 18:24 schreef John Naggets > >: > > It could be as you mention... your domU are they PV? I am using > paravirtualization exclusively and on this specific server have > the following CPU: > > Intel(R) Xeon(R) CPU=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 E5645=A0 @ 2.40G= Hz > > Do you have the intel-microcode Debian package from the non-free > repo installed on your servers? I currently don't... > > J. > > > On Mon, Nov 5, 2018 at 3:04 PM Roalt Zijlstra | webpower > > > wrote: > > Hi John, > > It could very well be that it is also restricted to some CPUs, > but I am inclinded to believe that the used DomU kernels can > influence stability.=A0 We did have a pretty busy SSL offloader= > running on a 3.16 kernel, which might have caused the crashes.=A0= > > Just for reference, we have the following two CPUs causing us > trouble, but I am not sure if it matters. > Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz > Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz > > Roalt > > > Op ma 5 nov. 2018 om 10:45 schreef John Naggets > >: > > Hi, > > Thanks for your feedback. I was wondering because I have > just upgraded a Debian 9 server to the latest kernel with > the latest Xen packages from the official Debian repo. The > only difference is that I have an older IBM server which > is already ~7 years old patched with the latest BIOS/UEFI > and so far so good no crash. The uptime is 6 days for now. > Here are the details about my kernel and xen packages. > > ii=A0 xen-hypervisor-4.8-amd64=A0=A0=A0=A0=A0=A0 > 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64=A0=A0=A0=A0=A0= =A0=A0 Xen > Hypervisor on AMD64 > ii=A0 linux-image-4.9.0-8-amd64=A0=A0=A0=A0=A0 > 4.9.110-3+deb9u6=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0 amd64=A0=A0=A0=A0=A0=A0=A0 > Linux 4.9 for 64-bit PCs > > Regards, > J. > > > On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen > wrote: > > Hi John, > > the problem is that I cannot provide any metrics or > logfiles showing an error. I can only tell that dom0 > is rebooting for a reason that is not logged. I have > no physical access to the server. I got one other > report about this kind of issue. > > My assumption the cause are the backported patches is > based on the current 16 day uptime. 16 days ago the > server rebooted every 3-5 days. It won=92t be a useful > bug report from my point of view. > > The other thing is that my two servers are now running > upstream Xen and kernel and I might not go back to > both old versions in Debian stretch. The other server > had always running upstream versions and had never a > problem, that=92s why I updated the other, too. > > > Best regards > =A0=A0 =A0Volker > > > Am 02.11.2018 um 17:23 schrieb John Naggets > >: > >> I was wondering if any of you guys reported this >> bug/issue/problem back to the Debian community? For >> example on their bugs.debian org web site? >> >> On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen >> > wrote: >> >> Hi, >> >> I had these crash problems with the Xen version >> in Debian stretch, too. After 3 to 7 days the Xen >> server rebooted without log entry or something >> else to observe. The problems started when the >> first patches were applied by Debian. Some >> updates made it better, the last worse again. I >> checked hard drives, RAM and closely monitored >> metrics what might be the cause. >> >> My solution after no longer suspecting a hardware >> fault: build upstream Xen 4.11 for Debian >> stretch. I am currently running this setup with >> my own build of kernel 4.19. The machines are now >> working stable again. >> >> >> =A0=A0 =A0Volker >> >> >> Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | >> webpower > >: >> >>> Hi there, >>> >>> Ever since all the Meltdown and Spectre kernel >>> updates and possibly also Xen 4.8 updates, we >>> experience crashes of the Dom0 just out of the >>> blue. Sometimes after 1 day, sometimes after a >>> few days or even 14 days, completely random. >>> >>> We have two Dell P730 servers and two Dell P720 >>> servers with this behaviour. One thing is that >>> we updated these machine to the latest available >>> firmware, because that is the most secure way. >>> Then we installed Debian Stretch with Xen 4.8 >>> support >>> >>> We have done serveral installs and 4 servers >>> seem to crash pretty fast and other don't. In >>> the end we think that we can lead it back to the >>> xen-4.8.4-pre version being stable and the >>> xen-4.8.5-pre being unstable. This was kinda >>> independent of the kernel that we were using >>> 4.14 or 4.9.0-8-amd64. This is off course all >>> Debian package numbering. >>> >>> As last resort=A0 we updated on one server all >>> DomU kernels of our Jessie servers on this Dom0 >>> to 4.9.0 from backports instead of the 3.16 >>> kernel. For now that seems to work, but the >>> crashes are random so it could happen any time >>> again. The idea is that these kernels are >>> completely spectre& meltdown unaware and might >>> cause trouble in Xen kernel support. I am not >>> sure if this is true at all, but we are pretty >>> lost what the actual cause is. >>> >>> We also tested with CentOS and we also had these >>> crashes there with certain combinations of >>> kernel/Xen. The most recent updates seem to be >>> more stable tough. The most frustrating part is >>> the there is absolutely no logs to be found. No >>> kernel oops or what.. the server just resets and >>> boots again. >>> >>> Are there others experiencing problems like >>> this? Do you see more frequent server/kernel >>> crashes on production servers?=A0=A0 >>> >>> Best regards, >>> =A0 >>> >>> Roalt Zijlstra >>> >>> _______________________________________________ >>> Xen-users mailing list >>> Xen-users@lists.xenproject.org >>> >>> https://lists.xenproject.org/mailman/listinfo/xen= -users >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xenproject.org >> >> https://lists.xenproject.org/mailman/listinfo/xen-= users >> > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xenproject.org > > https://lists.xenproject.org/mailman/listinfo/xen-users= > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xenproject.org > > https://lists.xenproject.org/mailman/listinfo/xen-users > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xenproject.org > https://lists.xenproject.org/mailman/listinfo/xen-users --------------CBE151FCEECCE17BEA3FA1AE Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit

Hello,


i had the same Issues.
In my case i tried
Ubuntu 18.04 with xen 4.9 and the Kernel Version 4.15.9 was the only one wo has start up the DomU.

Tested on AMD Ryzen 1800X and Intel 8700.

In my case i got random system freezes Uptimes between 7 and 30 Days.

Older and never Kernels wont run.
This Problem is still present, i going to switch all Services to Docker...

Regards,
Michael





Am 06.11.2018 um 09:37 schrieb Roalt Zijlstra | webpower:
Hi John,

Yes, we are using PV only and we only run Debian Linux on the servers. We still have some DomU Jessie servers running with the stock kernel. We did update our Dells to the latest firmware so it does include more recent intel microcode with that. But on Debian we did not yet enable the intel-firmware yet, since we had so much instability and so much parameters that could be the culprit, we did not want to add another.
If your server is very busy, I think the chance to have a crash is higher. We have seen crashes on our active MySQL databases whereas the slave MySQL database server did not crash that quickly, however after using the slave MySQL database as primary database for a while (because we were debugging the crashed master database) it could very well happen that the slave would crash too.

We have done tests with downgrading firmware of Dell (which also means using an older intel microcode) but that did not help. So having the latest firmware is okay. 
We are now testing a few scenarios:
  •  one server with an older kernel (4.9.0-4-amd64), with DomU 3.16 kernel, which runs for 16 days now
  •  one server with the updated -kernel (4.9.0-8-amd64), with DomU 3.16 kernel, which runs for 28 days now surprisingly
  •  one server with the updated -kernel (4.9.0-8-amd64), and all DomUs on the backported 4.9 kernel.
It all doesn't really make much sense. We do have the expectation that the older kernel will keep on running and that the 4.9 DomUs will help to keep the servers alive. 
We have tested with 4.14 and 4.16 kernels (from backports) but that did not make a difference in stability.

Best regards,
 
  Roalt Zijlstra
    Teamleader Infra & Deliverability
     
  roalt.zijlstra@webpower.nl
  +31 342 423 262
  roalt.zijlstra
  https://www.webpower-group.com
 

 
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Barcelona | Barneveld | Beijing | Chengdu | Guangzhou
Hamburg | Shanghai | Shenzhen | Stockholm		  



Op ma 5 nov. 2018 om 18:24 schreef John Naggets <hostingnuggets@gmail.com>:
It could be as you mention... your domU are they PV? I am using paravirtualization exclusively and on this specific server have the following CPU:

Intel(R) Xeon(R) CPU           E5645  @ 2.40GHz

Do you have the intel-microcode Debian package from the non-free repo installed on your servers? I currently don't...

J.


On Mon, Nov 5, 2018 at 3:04 PM Roalt Zijlstra | webpower <roalt.zijlstra@webpower.nl> wrote:
Hi John,

It could very well be that it is also restricted to some CPUs, but I am inclinded to believe that the used DomU kernels can influence stability.  We did have a pretty busy SSL offloader running on a 3.16 kernel, which might have caused the crashes. 

Just for reference, we have the following two CPUs causing us trouble, but I am not sure if it matters.
Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz
Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz

Roalt


Op ma 5 nov. 2018 om 10:45 schreef John Naggets <hostingnuggets@gmail.com>:
Hi,

Thanks for your feedback. I was wondering because I have just upgraded a Debian 9 server to the latest kernel with the latest Xen packages from the official Debian repo. The only difference is that I have an older IBM server which is already ~7 years old patched with the latest BIOS/UEFI and so far so good no crash. The uptime is 6 days for now. Here are the details about my kernel and xen packages.

ii  xen-hypervisor-4.8-amd64       4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64        Xen Hypervisor on AMD64
ii  linux-image-4.9.0-8-amd64      4.9.110-3+deb9u6                         amd64        Linux 4.9 for 64-bit PCs

Regards,
J.


On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen <volker@janzen.onl> wrote:
Hi John,

the problem is that I cannot provide any metrics or logfiles showing an error. I can only tell that dom0 is rebooting for a reason that is not logged. I have no physical access to the server. I got one other report about this kind of issue.

My assumption the cause are the backported patches is based on the current 16 day uptime. 16 days ago the server rebooted every 3-5 days. It won’t be a useful bug report from my point of view.

The other thing is that my two servers are now running upstream Xen and kernel and I might not go back to both old versions in Debian stretch. The other server had always running upstream versions and had never a problem, that’s why I updated the other, too.


Best regards
    Volker


Am 02.11.2018 um 17:23 schrieb John Naggets <hostingnuggets@gmail.com>:

I was wondering if any of you guys reported this bug/issue/problem back to the Debian community? For example on their bugs.debian org web site?

On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen <volker@janzen.onl> wrote:
Hi,

I had these crash problems with the Xen version in Debian stretch, too. After 3 to 7 days the Xen server rebooted without log entry or something else to observe. The problems started when the first patches were applied by Debian. Some updates made it better, the last worse again. I checked hard drives, RAM and closely monitored metrics what might be the cause.

My solution after no longer suspecting a hardware fault: build upstream Xen 4.11 for Debian stretch. I am currently running this setup with my own build of kernel 4.19. The machines are now working stable again.


    Volker


Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower <roalt.zijlstra@webpower.nl>:

Hi there,

Ever since all the Meltdown and Spectre kernel updates and possibly also Xen 4.8 updates, we experience crashes of the Dom0 just out of the blue. Sometimes after 1 day, sometimes after a few days or even 14 days, completely random.

We have two Dell P730 servers and two Dell P720 servers with this behaviour. One thing is that we updated these machine to the latest available firmware, because that is the most secure way. Then we installed Debian Stretch with Xen 4.8 support

We have done serveral installs and 4 servers seem to crash pretty fast and other don't. In the end we think that we can lead it back to the xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unstable. This was kinda independent of the kernel that we were using 4.14 or 4.9.0-8-amd64. This is off course all Debian package numbering.

As last resort  we updated on one server all DomU kernels of our Jessie servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. For now that seems to work, but the crashes are random so it could happen any time again. The idea is that these kernels are completely spectre& meltdown unaware and might cause trouble in Xen kernel support. I am not sure if this is true at all, but we are pretty lost what the actual cause is.

We also tested with CentOS and we also had these crashes there with certain combinations of kernel/Xen. The most recent updates seem to be more stable tough. The most frustrating part is the there is absolutely no logs to be found. No kernel oops or what.. the server just resets and boots again.

Are there others experiencing problems like this? Do you see more frequent server/kernel crashes on production servers?  

Best regards,
 
Roalt Zijlstra
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--------------CBE151FCEECCE17BEA3FA1AE-- --===============6955539779452206244== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLXVzZXJz IG1haWxpbmcgbGlzdApYZW4tdXNlcnNAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0 cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi11c2Vycw== --===============6955539779452206244==-- From xen-users-bounces@lists.xenproject.org Tue Nov 06 11:42:01 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Tue, 06 Nov 2018 11:42:01 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gJzit-0003Wo-K6; Tue, 06 Nov 2018 11:40:43 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gJzir-0003Wj-FG for xen-users@lists.xenproject.org; Tue, 06 Nov 2018 11:40:42 +0000 X-Inumbo-ID: c6a07933-e1b8-11e8-9a16-bc764e045a96 Received: from mail-qt1-x842.google.com (unknown [2607:f8b0:4864:20::842]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id c6a07933-e1b8-11e8-9a16-bc764e045a96; Tue, 06 Nov 2018 11:40:36 +0000 (UTC) Received: by mail-qt1-x842.google.com with SMTP id p35so2156118qtc.4 for ; Tue, 06 Nov 2018 03:40:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=webpower.nl; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ciC/1mGzKZ0MhSc7n/lB3eLkMLPTXwkAfQfYsqjwCfQ=; b=mZzP4E8qYumZ9SkZ96JsJyEL9QbwjLQqu2JLTFP2U8wV+kI2GgjtDCJX/ODJjTB/d0 TuYk61hqfVf1FQutbNmbpa7qiWCgVK1UzgedEooqPWuRNUXnyFcIOIYj4eKzBFD0dvC7 vxU1Tc/P50EL4p15xuZoSUeBrjUFf6BDMvnWk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ciC/1mGzKZ0MhSc7n/lB3eLkMLPTXwkAfQfYsqjwCfQ=; b=BkmH7EQ4wY3BK/r5hWcfMrdhxwCB9A0GhkcqfE4M193DXBbgMWAZe9CdzvhBP9qqi8 Q6emuWKCm5/gUFAldScqjIaXXCymmArCltXB2Y9ASlWC3eb43dYBYDAr5w9TmgqyvcXi MOtyMPKLgHm0o7aash3A4+PSSx9AQ9Kh8YR3l551XGEfcf6/hu9h46oU1MCG/P4unzI2 /IPQy6DbIDcSUfa1W9GNBvQg1iV3E4TZIeLkXRQpmcrYEnx60skwJ/LEWepVZaQqXERo Z9bNSvjiR5aPSnj/wkZhNhBd0wzDSzs1dflcXyz201Tclp6JZnU7Lbg++sLxNKlnmAB4 hUzA== X-Gm-Message-State: AGRZ1gKAY8h9XIh+E6izUMkSxBmjjvaxrWz0geec3x4du+H/6v1JvKPF T1HR0qwoR6cmkLzVBQNKUD9WWQ3XSvAqPW0VCwEjfg== X-Google-Smtp-Source: AJdET5djjTpmQnyxvEX84kzgW0eOzSCyWlTECvOIAYfNIWt26kPWbVu2FxIf6N/EVlrNb2W3qdlB4CpmSsdeaWLdzyM= X-Received: by 2002:a0c:c927:: with SMTP id r36mr25946383qvj.51.1541504435288; Tue, 06 Nov 2018 03:40:35 -0800 (PST) MIME-Version: 1.0 References: <501FA3A3-40E7-482D-B15E-D1BD7A82DAA9@janzen.onl> <0C698F19-82EB-4354-8E07-D33EC5977EAF@janzen.onl> <02b0d310-e0ba-02c2-e839-bea736cef65c@gmx.de> In-Reply-To: <02b0d310-e0ba-02c2-e839-bea736cef65c@gmx.de> From: "Roalt Zijlstra | webpower" Date: Tue, 6 Nov 2018 12:40:24 +0100 Message-ID: To: delajamal@gmx.de Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-users@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============3244834490588964777==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============3244834490588964777== Content-Type: multipart/alternative; boundary="0000000000004916770579fd7866" --0000000000004916770579fd7866 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Michael, I am not sure about the status of Ubuntu and Xen. My advise would be to downgrade you Xen version to the previous version and see if that is more stable. For Debian that worked, it is less secure, but crashing servers is not what you want. Maybe that an updated Xen will have stability fixes. Best regards, Roalt Zijlstra Teamleader Infra & Deliverability roalt.zijlstra@webpower.nl +31 342 423 262 roalt.zijlstra https://www.webpower-group.com [image: Facebook] [image: Twitter] [image: Linkedin] Barcelona | Barneveld | Beijing | Chengdu | Guangzhou Hamburg | Shanghai | Shenzhen | Stockholm Op di 6 nov. 2018 om 10:19 schreef Michael : > Hello, > > > i had the same Issues. > In my case i tried > Ubuntu 18.04 with xen 4.9 and the Kernel Version 4.15.9 was the only one > wo has start up the DomU. > > Tested on AMD Ryzen 1800X and Intel 8700. > > In my case i got random system freezes Uptimes between 7 and 30 Days. > > Older and never Kernels wont run. > This Problem is still present, i going to switch all Services to Docker..= . > > Regards, > Michael > > > > > > Am 06.11.2018 um 09:37 schrieb Roalt Zijlstra | webpower: > > Hi John, > > Yes, we are using PV only and we only run Debian Linux on the servers. We > still have some DomU Jessie servers running with the stock kernel. We did > update our Dells to the latest firmware so it does include more recent > intel microcode with that. But on Debian we did not yet enable the > intel-firmware yet, since we had so much instability and so much paramete= rs > that could be the culprit, we did not want to add another. > If your server is very busy, I think the chance to have a crash is higher= . > We have seen crashes on our active MySQL databases whereas the slave MySQ= L > database server did not crash that quickly, however after using the slave > MySQL database as primary database for a while (because we were debugging > the crashed master database) it could very well happen that the slave wou= ld > crash too. > > We have done tests with downgrading firmware of Dell (which also means > using an older intel microcode) but that did not help. So having the late= st > firmware is okay. > We are now testing a few scenarios: > > - one server with an older kernel (4.9.0-4-amd64), with DomU 3.16 > kernel, which runs for 16 days now > - one server with the updated -kernel (4.9.0-8-amd64), with DomU 3.16 > kernel, which runs for 28 days now surprisingly > - one server with the updated -kernel (4.9.0-8-amd64), and all DomUs > on the backported 4.9 kernel. > > It all doesn't really make much sense. We do have the expectation that th= e > older kernel will keep on running and that the 4.9 DomUs will help to kee= p > the servers alive. > We have tested with 4.14 and 4.16 kernels (from backports) but that did > not make a difference in stability. > > Best regards, > > Roalt Zijlstra > Teamleader Infra & Deliverability > > roalt.zijlstra@webpower.nl > +31 342 423 262 > roalt.zijlstra > https://www.webpower-group.com > > > > > [image: Facebook] > [image: Twitter] [image: Linkedin] > > > Barcelona | Barneveld | Beijing | Chengdu | Guangzhou > Hamburg | Shanghai | Shenzhen | Stockholm > > > > > > Op ma 5 nov. 2018 om 18:24 schreef John Naggets >: > >> It could be as you mention... your domU are they PV? I am using >> paravirtualization exclusively and on this specific server have the >> following CPU: >> >> Intel(R) Xeon(R) CPU E5645 @ 2.40GHz >> >> Do you have the intel-microcode Debian package from the non-free repo >> installed on your servers? I currently don't... >> >> J. >> >> >> On Mon, Nov 5, 2018 at 3:04 PM Roalt Zijlstra | webpower < >> roalt.zijlstra@webpower.nl> wrote: >> >>> Hi John, >>> >>> It could very well be that it is also restricted to some CPUs, but I am >>> inclinded to believe that the used DomU kernels can influence stability= . >>> We did have a pretty busy SSL offloader running on a 3.16 kernel, which >>> might have caused the crashes. >>> >>> Just for reference, we have the following two CPUs causing us trouble, >>> but I am not sure if it matters. >>> Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz >>> Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz >>> >>> Roalt >>> >>> >>> Op ma 5 nov. 2018 om 10:45 schreef John Naggets < >>> hostingnuggets@gmail.com>: >>> >>>> Hi, >>>> >>>> Thanks for your feedback. I was wondering because I have just upgraded >>>> a Debian 9 server to the latest kernel with the latest Xen packages fr= om >>>> the official Debian repo. The only difference is that I have an older = IBM >>>> server which is already ~7 years old patched with the latest BIOS/UEFI= and >>>> so far so good no crash. The uptime is 6 days for now. Here are the de= tails >>>> about my kernel and xen packages. >>>> >>>> ii xen-hypervisor-4.8-amd64 >>>> 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Xen Hypervisor o= n >>>> AMD64 >>>> ii linux-image-4.9.0-8-amd64 >>>> 4.9.110-3+deb9u6 amd64 Linux 4.9 for 64= -bit >>>> PCs >>>> >>>> Regards, >>>> J. >>>> >>>> >>>> On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen >>>> wrote: >>>> >>>>> Hi John, >>>>> >>>>> the problem is that I cannot provide any metrics or logfiles showing >>>>> an error. I can only tell that dom0 is rebooting for a reason that is= not >>>>> logged. I have no physical access to the server. I got one other repo= rt >>>>> about this kind of issue. >>>>> >>>>> My assumption the cause are the backported patches is based on the >>>>> current 16 day uptime. 16 days ago the server rebooted every 3-5 days= . It >>>>> won=E2=80=99t be a useful bug report from my point of view. >>>>> >>>>> The other thing is that my two servers are now running upstream Xen >>>>> and kernel and I might not go back to both old versions in Debian str= etch. >>>>> The other server had always running upstream versions and had never a >>>>> problem, that=E2=80=99s why I updated the other, too. >>>>> >>>>> >>>>> Best regards >>>>> Volker >>>>> >>>>> >>>>> Am 02.11.2018 um 17:23 schrieb John Naggets >>>> >: >>>>> >>>>> I was wondering if any of you guys reported this bug/issue/problem >>>>> back to the Debian community? For example on their bugs.debian org we= b site? >>>>> >>>>> On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen >>>>> wrote: >>>>> >>>>>> Hi, >>>>>> >>>>>> I had these crash problems with the Xen version in Debian stretch, >>>>>> too. After 3 to 7 days the Xen server rebooted without log entry or >>>>>> something else to observe. The problems started when the first patch= es were >>>>>> applied by Debian. Some updates made it better, the last worse again= . I >>>>>> checked hard drives, RAM and closely monitored metrics what might be= the >>>>>> cause. >>>>>> >>>>>> My solution after no longer suspecting a hardware fault: build >>>>>> upstream Xen 4.11 for Debian stretch. I am currently running this se= tup >>>>>> with my own build of kernel 4.19. The machines are now working stabl= e again. >>>>>> >>>>>> >>>>>> Volker >>>>>> >>>>>> >>>>>> Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower < >>>>>> roalt.zijlstra@webpower.nl>: >>>>>> >>>>>> Hi there, >>>>>> >>>>>> Ever since all the Meltdown and Spectre kernel updates and possibly >>>>>> also Xen 4.8 updates, we experience crashes of the Dom0 just out of = the >>>>>> blue. Sometimes after 1 day, sometimes after a few days or even 14 d= ays, >>>>>> completely random. >>>>>> >>>>>> We have two Dell P730 servers and two Dell P720 servers with this >>>>>> behaviour. One thing is that we updated these machine to the latest >>>>>> available firmware, because that is the most secure way. Then we ins= talled >>>>>> Debian Stretch with Xen 4.8 support >>>>>> >>>>>> We have done serveral installs and 4 servers seem to crash pretty >>>>>> fast and other don't. In the end we think that we can lead it back t= o the >>>>>> xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unsta= ble. >>>>>> This was kinda independent of the kernel that we were using 4.14 or >>>>>> 4.9.0-8-amd64. This is off course all Debian package numbering. >>>>>> >>>>>> As last resort we updated on one server all DomU kernels of our >>>>>> Jessie servers on this Dom0 to 4.9.0 from backports instead of the 3= .16 >>>>>> kernel. For now that seems to work, but the crashes are random so it= could >>>>>> happen any time again. The idea is that these kernels are completely >>>>>> spectre& meltdown unaware and might cause trouble in Xen kernel supp= ort. I >>>>>> am not sure if this is true at all, but we are pretty lost what the = actual >>>>>> cause is. >>>>>> >>>>>> We also tested with CentOS and we also had these crashes there with >>>>>> certain combinations of kernel/Xen. The most recent updates seem to = be more >>>>>> stable tough. The most frustrating part is the there is absolutely n= o logs >>>>>> to be found. No kernel oops or what.. the server just resets and boo= ts >>>>>> again. >>>>>> >>>>>> Are there others experiencing problems like this? Do you see more >>>>>> frequent server/kernel crashes on production servers? >>>>>> >>>>>> Best regards, >>>>>> Roalt Zijlstra >>>>>> >>>>>> _______________________________________________ >>>>>> Xen-users mailing list >>>>>> Xen-users@lists.xenproject.org >>>>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>>>>> >>>>>> _______________________________________________ >>>>>> Xen-users mailing list >>>>>> Xen-users@lists.xenproject.org >>>>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>>>> >>>>> _______________________________________________ >>>>> Xen-users mailing list >>>>> Xen-users@lists.xenproject.org >>>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>>> >>>> _______________________________________________ >>>> Xen-users mailing list >>>> Xen-users@lists.xenproject.org >>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>> >>> > > _______________________________________________ > Xen-users mailing listXen-users@lists.xenproject.orghttps://lists.xenproj= ect.org/mailman/listinfo/xen-users > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xenproject.org > https://lists.xenproject.org/mailman/listinfo/xen-users --0000000000004916770579fd7866 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Michael,
I am not sure about the status of Ubuntu and Xen.= =C2=A0
My advise would be to downgrade you Xen vers= ion to the previous version and see if that is more stable. For Debian that= worked, it is less secure, but crashing servers is not what you want. Mayb= e that an updated Xen will have stability fixes.

Best regards,
=C2=A0
Roalt Zijlstra<= td valign=3D"top" align=3D"left" width=3D"20">=C2=A0
=C2=A0
=C2=A0=C2=A0<= /font>Teamleader Infra & Deliverability
=C2=A0=C2=A0=C2=A0
=C2=A0roalt.zijlst= ra@webpower.nl
+31 342 423 262
<= /td>=C2=A0roalt.zijlstra
=C2=A0https://www.webpower= -group.com
=C2=A0
<= /tr>
=C2=A0
3D"Facebook"=C2=A03D"Twitter"=C2=A0= 3D"Linkedin"
Barcelona | Barneveld | Beijing | Cheng= du | Guangzhou
Hamburg | Shanghai | Shenzhen | Stockholm


Op di 6 nov. 2018 om 10:19 schreef Micha= el <delajamal@gmx.de>:
=20 =20 =20

Hello,


i had the same Issues.
In my case i tried
Ubuntu 18.04 with xen 4.9 and the Kernel Version 4.15.9 was the only one wo has start up the DomU.

Tested on AMD Ryzen 1800X and Intel 8700.

In my case i got random system freezes Uptimes between 7 and 30 Days.

Older and never Kernels wont run.
This Problem is still present, i going to switch all Services to Docker...

Regards,
Michael





Am 06.11.2018 um 0= 9:37 schrieb Roalt Zijlstra | webpower:
=20
Hi John,

Yes, we are using PV only and we only run Debian Linux on the servers. We still have some DomU Jessie servers running with the stock kernel. We did update our Dells to the latest firmware so it does include more recent intel microcode with that. But on Debian we did not yet enable the intel-firmware yet, since we had so much instability and so much parameters that could be the culprit, we did not want to add another.
If your server is very busy, I think the chance to have a crash is higher. We have seen crashes on our active MySQL databases whereas the slave MySQL database server did not crash that quickly, however after using the slave MySQL database as primary database for a while (because we were debugging the crashed master database) it could very well happen that the slave would crash too.

We have done tests with downgrading firmware of Dell (which also means using an older intel microcode) but that did not help. So having the latest firmware is okay.=C2=A0
We are now testing a few scenarios:
  • =C2=A0one server with an older kernel (4.9.0-4-amd64), with DomU 3.16 kernel, which runs for 16 days now
  • =C2=A0one server with the updated -kernel (4.9.0-8-amd64), with DomU 3.16 kernel, which runs for 28 days now surprisingly
  • =C2=A0one server with=C2=A0the updated -kernel (4.9.0-8-amd64),=C2=A0and all DomUs on the backported 4.9 kernel.
It all doesn't really make much sense. We do have the expectation that the older kernel will keep on running and that the 4.9 DomUs will help to keep the servers alive.=C2=A0=
We have tested with 4.14 and 4.16 kernels (from backports) but that did not make a difference in stability.

Best regards,
=C2= =A0
= =C2= =A0 Roalt Zijlstra
=C2= =A0 =C2= =A0 Teamleader Infra & Deliverability
=C2= =A0 =C2= =A0 =C2= =A0
=C2= =A0 roalt= .zijlstra@webpower.nl
=C2= =A0 +31 342 423 262
=C2= =A0 roalt.zijlstra
=C2= =A0 https= ://www.webpower-group.com
=C2= =A0

=C2= =A0
3D"Facebook" =C2= =A0 3D"Twit= =C2= =A0

Barce= lona | Barneveld | Beijing | Chengdu | Guangzhou
Hamburg | Shanghai | Shenzhen | Stockholm<= /td> 		=C2= =A0



Op ma 5 nov. 2018 om 18:24 schreef John Naggets <hostingnuggets@gmail.com>:
It could be as you mention... your domU are they PV? I am using paravirtualization exclusively and on this specific server have the following CPU:

Intel(R) Xeon(R) CPU=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 E5645=C2=A0 @ 2.40GHz

Do you have the intel-microcode Debian package from the non-free repo installed on your servers? I currently don't...

J.


On Mon, Nov 5, 2018 at 3:04 PM Roalt Zijlstra | webpower <roalt.zijlstra@webpower.nl> wrote:
Hi John,

It could very well be that it is also restricted to some CPUs, but I am inclinded to believe that the used DomU kernels can influence stability.=C2=A0 We d= id have a pretty busy SSL offloader running on a 3.16 kernel, which might have caused the crashes.=C2=A0

Just for reference, we have the following two CPUs causing us trouble, but I am not sure if it matters.
Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz
Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz

Roalt


Op ma 5 nov. 2018 om 10:45 schreef John Naggets <hostingnuggets@gmail.com>:
Hi,

Thanks for your feedback. I was wondering because I have just upgraded a Debian 9 server to the latest kernel with the latest Xen packages from the official Debian repo. The only difference is that I have an older IBM server which is already ~7 years old patched with the latest BIOS/UEFI and so far so good no crash. The uptime is 6 days for now. Here are the details about my kernel and xen packages.

ii=C2=A0 xen-hypervisor-4.8-amd64=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 X= en Hypervisor on AMD64
ii=C2=A0 linux-image-4.9.0-8-amd64=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 4.9.110-3+deb9u6=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 L= inux 4.9 for 64-bit PCs

Regards,
J.


On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen <volker@j= anzen.onl> wrote:
Hi John,

the problem is that I cannot provide any metrics or logfiles showing an error. I can only tell that dom0 is rebooting for a reason that is not logged. I have no physical access to the server. I got one other report about this kind of issue.

My assumption the cause are the backported patches is based on the current 16 day uptime. 16 days ago the server rebooted every 3-5 days. It won=E2=80=99t be a useful bug report fro= m my point of view.

The other thing is that my two servers are now running upstream Xen and kernel and I might not go back to both old versions in Debian stretch. The other server had always running upstream versions and had never a problem, that=E2=80=99s why I updated the other, = too.


Best regards
=C2=A0=C2=A0 =C2=A0Volker


Am 02.11.2018 um 17:23 schrieb John Naggets <hostingnuggets@gmail.com>:

I was wondering if any of you guys reported this bug/issue/problem back to the Debian community? For example on their bugs.debian org web site?

On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen <volker@janzen.onl> wrote:
Hi,

I had these crash problems with the Xen version in Debian stretch, too. After 3 to 7 days the Xen server rebooted without log entry or something else to observe. The problems started when the first patches were applied by Debian. Some updates made it better, the last worse again. I checked hard drives, RAM and closely monitored metrics what might be the cause.

My solution after no longer suspecting a hardware fault: build upstream Xen 4.11 for Debian stretch. I am currently running this setup with my own build of kernel 4.19. The machines are now working stable again.


=C2=A0=C2=A0 =C2=A0Volker


Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower <roalt.zijlstra@web= power.nl>:

Hi there,

Ever since all the Meltdown and Spectre kernel updates and possibly also Xen 4.8 updates, we experience crashes of the Dom0 just out of the blue. Sometimes after 1 day, sometimes after a few days or even 14 days, completely random.

We have two Dell P730 servers and two Dell P720 servers with this behaviour. One thing is that we updated these machine to the latest available firmware, because that is the most secure way. Then we installed Debian Stretch with Xen 4.8 support

We have done serveral installs and 4 servers seem to crash pretty fast and other don't. In the end we think that we can lead it back to the xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unstable. This was kinda independent of the kernel that we were using 4.14 or 4.9.0-8-amd64. This is off course all Debian package numbering.

As last resort=C2=A0 we updated on one server all DomU kernels of our Jessie servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. For now that seems to work, but the crashes are random so it could happen any time again. The idea is that these kernels are completely spectre& meltdown unaware and might cause trouble in Xen kernel support. I am not sure if this is true at all, but we are pretty lost what the actual cause is.

We also tested with CentOS and we also had these crashes there with certain combinations of kernel/Xen. The most recent updates seem to be more stable tough. The most frustrating part is the there is absolutely no logs to be found. No kernel oops or what.. the server just resets and boots again.

Are there others experiencing problems like this? Do you see more frequent server/kernel crashes on production servers?=C2=A0=C2=A0

Best regards,
=C2= =A0
Roalt Zijlstra
______________= _________________________________
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https://lists.xenprojec= t.org/mailman/listinfo/xen-users
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https://lists.xenproject.or= g/mailman/listinfo/xen-users


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--0000000000004916770579fd7866-- --===============3244834490588964777== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLXVzZXJz IG1haWxpbmcgbGlzdApYZW4tdXNlcnNAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0 cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi11c2Vycw== --===============3244834490588964777==-- From xen-users-bounces@lists.xenproject.org Tue Nov 06 17:12:07 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Tue, 06 Nov 2018 17:12:07 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gK4sT-0000Bj-SF; Tue, 06 Nov 2018 17:10:57 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gK4sR-0000Be-UW for xen-users@lists.xenproject.org; Tue, 06 Nov 2018 17:10:56 +0000 X-Inumbo-ID: ea743436-e1e6-11e8-9a16-bc764e045a96 Received: from mail-io1-xd41.google.com (unknown [2607:f8b0:4864:20::d41]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id ea743436-e1e6-11e8-9a16-bc764e045a96; Tue, 06 Nov 2018 17:10:52 +0000 (UTC) Received: by mail-io1-xd41.google.com with SMTP id a23-v6so9792114iod.7 for ; Tue, 06 Nov 2018 09:10:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=KU+jNa3ihyioxLAUCiYEoQ3j3UIh7RZFRe1O7F+zlDY=; b=I540lJyN4qsODnDoLtWrOzXxSRXLq+MM1FbuO9Q9N3Hd8NeJnguREpJ2wZ03HTGwLj gPwc7cbj27N3/rQmQ1w6vywaVMtCh9q3DgOkcuTcxAW6Ov5XTjWyCr2jMwGzvekvofkT glNv3/h90DnUCYZOW8iW3EUm8WdaWaB8ZXALkaQXo1PUV+8l8HDM65KnxITwlkaaGUFT FpOARNBlU76xZr2/FHejicDKuDQiWK3gmaV+ecTejcfmCPjYDJ0Xwt5JfJI0zK8mh/WP vdnwpvol7RNCvDK7jX+gaO7fdl129yIVWnCsACGiV9Ahj456iIO3p26oTvP71XWhKQZ4 vObg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=KU+jNa3ihyioxLAUCiYEoQ3j3UIh7RZFRe1O7F+zlDY=; b=kXXhIIh9/gslMmSuji5oZmZnkzLt5AV7cOf2Pmw566YFCh7A0la1wQKvq2YloZK1Ia s+ooOzF5C5SQ+DCsjUflcwpf2hsM+klEPw6FoaQC35U4+LkmbbuxUNpJ+i4294+JSFsp HdvmjhgdaNFzXRG6lYag0xjaS99CgjjM3f7O98zXsf9uYO9c31yCApITjZNiwygtD1ux VDFNberfRiaqHyIIfNP/bXEp4vyD3XOdhp33KXJtrqPnIbi72kTTFGCX9bEZ0zFfve6h kyIbd//EE6XCbkpQCbIcauK63B30smA/WMw68guHs7baOmqoRGWt13S+4kyGMqtca46/ Chqw== X-Gm-Message-State: AGRZ1gIOzoIpI1POUXseIyekZsWsRkvxfJyrGz89jtev/+EpnTTuNehE D4smQuzT/Ez/S/KckxdVA+YORZLvQT7qoPw+Z89OOA== X-Google-Smtp-Source: AJdET5d59Zw7O9I2F6IAVDQNv6OM9lEr7RLIxi9KO/WgB90CMk/ot1aXlQypTC6pTzQw1qe8X2ksVckGPjAwn2Snu1g= X-Received: by 2002:a6b:7f0b:: with SMTP id l11-v6mr22957431ioq.221.1541524252300; Tue, 06 Nov 2018 09:10:52 -0800 (PST) MIME-Version: 1.0 References: <501FA3A3-40E7-482D-B15E-D1BD7A82DAA9@janzen.onl> <0C698F19-82EB-4354-8E07-D33EC5977EAF@janzen.onl> In-Reply-To: From: John Naggets Date: Tue, 6 Nov 2018 18:10:38 +0100 Message-ID: To: "Roalt Zijlstra | webpower" Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-users@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============2011569344939808055==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============2011569344939808055== Content-Type: multipart/alternative; boundary="000000000000789b11057a0215a2" --000000000000789b11057a0215a2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Thanks to both of you for your detailed information. So as you both do not have the intel-microcode package installed it can't be that the issue. I do not make use of that package either myself. So what is left? Well it looks like I am running on older hardware, at least 5 years old hardware and who knows if this has some kind of influence. It might be interesting to get in touch with the hardware manufacturer (DELL?) and ask them if they have other customers with this issue. The only problem here is that as soon as you mention Debian they will stop listening to you :( If I remember correctly they only take support cases for supported commercial Linux distributions which basically boils down to RHEL and SLES... Maybe the DELL forums would be a better alternative. I would definitely recommend filling a bug issue with Debian and maybe even Xen... If you have some kind of stack trace that would also be interesting to see. J. On Tue, Nov 6, 2018 at 9:37 AM Roalt Zijlstra | webpower < roalt.zijlstra@webpower.nl> wrote: > Hi John, > > Yes, we are using PV only and we only run Debian Linux on the servers. We > still have some DomU Jessie servers running with the stock kernel. We did > update our Dells to the latest firmware so it does include more recent > intel microcode with that. But on Debian we did not yet enable the > intel-firmware yet, since we had so much instability and so much paramete= rs > that could be the culprit, we did not want to add another. > If your server is very busy, I think the chance to have a crash is higher= . > We have seen crashes on our active MySQL databases whereas the slave MySQ= L > database server did not crash that quickly, however after using the slave > MySQL database as primary database for a while (because we were debugging > the crashed master database) it could very well happen that the slave wou= ld > crash too. > > We have done tests with downgrading firmware of Dell (which also means > using an older intel microcode) but that did not help. So having the late= st > firmware is okay. > We are now testing a few scenarios: > > - one server with an older kernel (4.9.0-4-amd64), with DomU 3.16 > kernel, which runs for 16 days now > - one server with the updated -kernel (4.9.0-8-amd64), with DomU 3.16 > kernel, which runs for 28 days now surprisingly > - one server with the updated -kernel (4.9.0-8-amd64), and all DomUs > on the backported 4.9 kernel. > > It all doesn't really make much sense. We do have the expectation that th= e > older kernel will keep on running and that the 4.9 DomUs will help to kee= p > the servers alive. > We have tested with 4.14 and 4.16 kernels (from backports) but that did > not make a difference in stability. > > Best regards, > > Roalt Zijlstra > Teamleader Infra & Deliverability > > roalt.zijlstra@webpower.nl > +31 342 423 262 > roalt.zijlstra > https://www.webpower-group.com > > > > [image: Facebook] > [image: Twitter] [image: Linkedin] > > Barcelona | Barneveld | Beijing | Chengdu | Guangzhou > Hamburg | Shanghai | Shenzhen | Stockholm > > > > > Op ma 5 nov. 2018 om 18:24 schreef John Naggets >: > >> It could be as you mention... your domU are they PV? I am using >> paravirtualization exclusively and on this specific server have the >> following CPU: >> >> Intel(R) Xeon(R) CPU E5645 @ 2.40GHz >> >> Do you have the intel-microcode Debian package from the non-free repo >> installed on your servers? I currently don't... >> >> J. >> >> >> On Mon, Nov 5, 2018 at 3:04 PM Roalt Zijlstra | webpower < >> roalt.zijlstra@webpower.nl> wrote: >> >>> Hi John, >>> >>> It could very well be that it is also restricted to some CPUs, but I am >>> inclinded to believe that the used DomU kernels can influence stability= . >>> We did have a pretty busy SSL offloader running on a 3.16 kernel, which >>> might have caused the crashes. >>> >>> Just for reference, we have the following two CPUs causing us trouble, >>> but I am not sure if it matters. >>> Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz >>> Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz >>> >>> Roalt >>> >>> >>> Op ma 5 nov. 2018 om 10:45 schreef John Naggets < >>> hostingnuggets@gmail.com>: >>> >>>> Hi, >>>> >>>> Thanks for your feedback. I was wondering because I have just upgraded >>>> a Debian 9 server to the latest kernel with the latest Xen packages fr= om >>>> the official Debian repo. The only difference is that I have an older = IBM >>>> server which is already ~7 years old patched with the latest BIOS/UEFI= and >>>> so far so good no crash. The uptime is 6 days for now. Here are the de= tails >>>> about my kernel and xen packages. >>>> >>>> ii xen-hypervisor-4.8-amd64 >>>> 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Xen Hypervisor o= n >>>> AMD64 >>>> ii linux-image-4.9.0-8-amd64 >>>> 4.9.110-3+deb9u6 amd64 Linux 4.9 for 64= -bit >>>> PCs >>>> >>>> Regards, >>>> J. >>>> >>>> >>>> On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen wrote= : >>>> >>>>> Hi John, >>>>> >>>>> the problem is that I cannot provide any metrics or logfiles showing >>>>> an error. I can only tell that dom0 is rebooting for a reason that is= not >>>>> logged. I have no physical access to the server. I got one other repo= rt >>>>> about this kind of issue. >>>>> >>>>> My assumption the cause are the backported patches is based on the >>>>> current 16 day uptime. 16 days ago the server rebooted every 3-5 days= . It >>>>> won=E2=80=99t be a useful bug report from my point of view. >>>>> >>>>> The other thing is that my two servers are now running upstream Xen >>>>> and kernel and I might not go back to both old versions in Debian str= etch. >>>>> The other server had always running upstream versions and had never a >>>>> problem, that=E2=80=99s why I updated the other, too. >>>>> >>>>> >>>>> Best regards >>>>> Volker >>>>> >>>>> >>>>> Am 02.11.2018 um 17:23 schrieb John Naggets >>>> >: >>>>> >>>>> I was wondering if any of you guys reported this bug/issue/problem >>>>> back to the Debian community? For example on their bugs.debian org we= b site? >>>>> >>>>> On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen >>>>> wrote: >>>>> >>>>>> Hi, >>>>>> >>>>>> I had these crash problems with the Xen version in Debian stretch, >>>>>> too. After 3 to 7 days the Xen server rebooted without log entry or >>>>>> something else to observe. The problems started when the first patch= es were >>>>>> applied by Debian. Some updates made it better, the last worse again= . I >>>>>> checked hard drives, RAM and closely monitored metrics what might be= the >>>>>> cause. >>>>>> >>>>>> My solution after no longer suspecting a hardware fault: build >>>>>> upstream Xen 4.11 for Debian stretch. I am currently running this se= tup >>>>>> with my own build of kernel 4.19. The machines are now working stabl= e again. >>>>>> >>>>>> >>>>>> Volker >>>>>> >>>>>> >>>>>> Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower < >>>>>> roalt.zijlstra@webpower.nl>: >>>>>> >>>>>> Hi there, >>>>>> >>>>>> Ever since all the Meltdown and Spectre kernel updates and possibly >>>>>> also Xen 4.8 updates, we experience crashes of the Dom0 just out of = the >>>>>> blue. Sometimes after 1 day, sometimes after a few days or even 14 d= ays, >>>>>> completely random. >>>>>> >>>>>> We have two Dell P730 servers and two Dell P720 servers with this >>>>>> behaviour. One thing is that we updated these machine to the latest >>>>>> available firmware, because that is the most secure way. Then we ins= talled >>>>>> Debian Stretch with Xen 4.8 support >>>>>> >>>>>> We have done serveral installs and 4 servers seem to crash pretty >>>>>> fast and other don't. In the end we think that we can lead it back t= o the >>>>>> xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unsta= ble. >>>>>> This was kinda independent of the kernel that we were using 4.14 or >>>>>> 4.9.0-8-amd64. This is off course all Debian package numbering. >>>>>> >>>>>> As last resort we updated on one server all DomU kernels of our >>>>>> Jessie servers on this Dom0 to 4.9.0 from backports instead of the 3= .16 >>>>>> kernel. For now that seems to work, but the crashes are random so it= could >>>>>> happen any time again. The idea is that these kernels are completely >>>>>> spectre& meltdown unaware and might cause trouble in Xen kernel supp= ort. I >>>>>> am not sure if this is true at all, but we are pretty lost what the = actual >>>>>> cause is. >>>>>> >>>>>> We also tested with CentOS and we also had these crashes there with >>>>>> certain combinations of kernel/Xen. The most recent updates seem to = be more >>>>>> stable tough. The most frustrating part is the there is absolutely n= o logs >>>>>> to be found. No kernel oops or what.. the server just resets and boo= ts >>>>>> again. >>>>>> >>>>>> Are there others experiencing problems like this? Do you see more >>>>>> frequent server/kernel crashes on production servers? >>>>>> >>>>>> Best regards, >>>>>> Roalt Zijlstra >>>>>> >>>>>> _______________________________________________ >>>>>> Xen-users mailing list >>>>>> Xen-users@lists.xenproject.org >>>>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>>>>> >>>>>> _______________________________________________ >>>>>> Xen-users mailing list >>>>>> Xen-users@lists.xenproject.org >>>>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>>>> >>>>> _______________________________________________ >>>>> Xen-users mailing list >>>>> Xen-users@lists.xenproject.org >>>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>>> >>>> _______________________________________________ >>>> Xen-users mailing list >>>> Xen-users@lists.xenproject.org >>>> https://lists.xenproject.org/mailman/listinfo/xen-users >>> >>> --000000000000789b11057a0215a2 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Thanks to both of you for your detailed information. = So as you both do not have the intel-microcode package installed it can'= ;t be that the issue. I do not make use of that package either myself. So w= hat is left? Well it looks like I am running on older hardware, at least 5 = years old hardware and who knows if this has some kind of influence. It mig= ht be interesting to get in touch with the hardware manufacturer (DELL?) an= d ask them if they have other customers with this issue. The only problem h= ere is that as soon as you mention Debian they will stop listening to you := ( If I remember correctly they only take support cases for supported commer= cial Linux distributions which basically boils down to RHEL and SLES... May= be the DELL forums would be a better alternative. I would definitely recomm= end filling a bug issue with Debian and maybe even Xen... If you have some = kind of stack trace that would also be interesting to see.

J.

= On Tue, Nov 6, 2018 at 9:37 AM Roalt Zijlstra | webpower <roalt.zijlstra@webpower.nl> wrote:
Hi John,

Yes, we are using PV only and we only run Debian Linux= on the servers. We still have some DomU Jessie servers running with the st= ock kernel. We did update our Dells to the latest firmware so it does inclu= de more recent intel microcode with that. But on Debian we did not yet enab= le the intel-firmware yet, since we had so much instability and so much par= ameters that could be the culprit, we did not want to add another.
If your server is very busy, I think the chance to have a c= rash is higher. We have seen crashes on our active MySQL databases whereas = the slave MySQL database server did not crash that quickly, however after u= sing the slave MySQL database as primary database for a while (because we w= ere debugging the crashed master database) it could very well happen that t= he slave would crash too.

We have done tests with downgrading firmware of Dell (which also means = using an older intel microcode) but that did not help. So having the latest= firmware is okay.=C2=A0
We are now testing a few s= cenarios:
  • =C2=A0one server with an older ke= rnel (4.9.0-4-amd64), with DomU 3.16 kernel, which runs for 16 days now
    =
  • =C2=A0one server with the updated -kernel (4.9.0-8-amd64), with Do= mU 3.16 kernel, which runs for 28 days now surprisingly
  • =C2=A0o= ne server with=C2=A0the updated -kernel (4.9.0-8-amd64),=C2=A0and all DomUs= on the backported 4.9 kernel.
It all doe= sn't really make much sense. We do have the expectation that the older = kernel will keep on running and that the 4.9 DomUs will help to keep the se= rvers alive.=C2=A0
We have tested with 4.14 and 4.1= 6 kernels (from backports) but that did not make a difference in stability.=

Best regards,
=C2=A0
Roalt Zijlstra<= td valign=3D"top" align=3D"left" width=3D"20">=C2=A0
=C2=A0
=C2=A0=C2=A0<= /font>Teamleader Infra & Deliverability
=C2=A0=C2=A0=C2=A0
=C2=A0roalt.zijlst= ra@webpower.nl
+31 342 423 262
<= /td>=C2=A0roalt.zijlstra
=C2=A0https://www.webpower= -group.com
=C2=A0
<= /tr>
=C2=A0
3D"Facebook"=C2=A03D"Twitter"=C2=A0= 3D"Linkedin"
Barcelona | Barneveld | Beijing | Cheng= du | Guangzhou
Hamburg | Shanghai | Shenzhen | Stockholm

<= br>
Op ma 5 nov. 2018 om 18:24 s= chreef John Naggets <hostingnuggets@gmail.com>:
It could= be as you mention... your domU are they PV? I am using paravirtualization = exclusively and on this specific server have the following CPU:
<= br>
Intel(R) Xeon(R) CPU=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 E5645=C2=A0 @ 2.40GHz

Do you= have the intel-microcode Debian package from the non-free repo installed o= n your servers? I currently don't...

J.


On Mon, Nov 5, 2018 at 3:04 PM Roalt Zijlstra | webpower <<= a href=3D"mailto:roalt.zijlstra@webpower.nl" target=3D"_blank">roalt.zijlst= ra@webpower.nl> wrote:
Hi John,

It could very well be t= hat it is also restricted to some CPUs, but I am inclinded to believe that = the used DomU kernels can influence stability.=C2=A0 We did have a pretty b= usy SSL offloader running on a 3.16 kernel, which might have caused the cra= shes.=C2=A0

Just for r= eference, we have the following two CPUs causing us trouble, but I am not s= ure if it matters.
Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz

=
Ro= alt
<= div style=3D"color:rgb(102,102,102);font-family:arial,helvetica,sans-serif;= font-size:12.8px">


Op ma 5 nov. 2018 om 10:45 schreef J= ohn Naggets <hostingnuggets@gmail.com>:
Hi,
Thanks for your feedback. I was wondering because I have just u= pgraded a Debian 9 server to the latest kernel with the latest Xen packages= from the official Debian repo. The only difference is that I have an older= IBM server which is already ~7 years old patched with the latest BIOS/UEFI= and so far so good no crash. The uptime is 6 days for now. Here are the de= tails about my kernel and xen packages.

ii=C2=A0 x= en-hypervisor-4.8-amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4.8.4+xsa273+sh= im4.10.1+xsa273-1+deb9u10 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 X= en Hypervisor on AMD64
ii=C2=A0 linux-image-4.9.0-8-amd64=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 4.9.110-3+deb9u6=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 amd64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Linux 4.9 for 64-bit PCs

Regards,
J= .


=
On Fri, Nov 2, 2018 at 7:57 PM Volker Janzen <volker@ja= nzen.onl> wrote:
Hi John,

the problem is that I cannot provide any metrics or logfiles showing a= n error. I can only tell that dom0 is rebooting for a reason that is not lo= gged. I have no physical access to the server. I got one other report about= this kind of issue.

My assumption the cause are the backported patches is based on the cur= rent 16 day uptime. 16 days ago the server rebooted every 3-5 days. It won= =E2=80=99t be a useful bug report from my point of view.

The other thing is that my two servers are now running upstream Xen an= d kernel and I might not go back to both old versions in Debian stretch. Th= e other server had always running upstream versions and had never a problem= , that=E2=80=99s why I updated the other, too.


Best regards
=C2=A0=C2=A0 =C2=A0Volker


Am 02.11.2018 um 17:23 schrieb John Naggets <hostingnuggets@gmail.com>:

I was wondering if any of you guys reported this bug/issue= /problem back to the Debian community? For example on their bugs.debian org= web site?

On Thu, Nov 1, 2018 at 1:47 PM Volker Janzen <volker@janzen.onl> w= rote:
Hi,

I had these crash problems with the Xen version in Debian = stretch, too. After 3 to 7 days the Xen server rebooted without log entry o= r something else to observe. The problems started when the first patches we= re applied by Debian. Some updates made it better, the last worse again. I checked hard drives, RAM and close= ly monitored metrics what might be the cause.

My solution after no longer suspecting a hardware fault: b= uild upstream Xen 4.11 for Debian stretch. I am currently running this setu= p with my own build of kernel 4.19. The machines are now working stable aga= in.


=C2=A0=C2=A0 =C2=A0Volker


Am 29.10.2018 um 13:13 schrieb Roalt Zijlstra | webpower <roalt.zijlstra@webpower.n= l>:

Hi there,

Ever since all the Meltdown and Spectre kernel updates and possibly also Xe= n 4.8 updates, we experience crashes of the Dom0 just out of the blue. Some= times after 1 day, sometimes after a few days or even 14 days, completely r= andom.

We have two Dell P730 servers and two Dell P720 servers with this behaviour= . One thing is that we updated these machine to the latest available firmwa= re, because that is the most secure way. Then we installed Debian Stretch w= ith Xen 4.8 support

We have done serveral installs and 4 servers seem to crash pretty fast and = other don't. In the end we think that we can lead it back to the xen-4.= 8.4-pre version being stable and the xen-4.8.5-pre being unstable. This was= kinda independent of the kernel that we were using 4.14 or 4.9.0-8-amd64. This is off course all Debian package= numbering.

As last resort=C2=A0 we updated on one server all DomU kernels of our Jessi= e servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. = For now that seems to work, but the crashes are random so it could happen a= ny time again. The idea is that these kernels are completely spectre& meltdown unaware and might cause troub= le in Xen kernel support. I am not sure if this is true at all, but we are = pretty lost what the actual cause is.

We also tested with CentOS and we also had these crashes there with certain= combinations of kernel/Xen. The most recent updates seem to be more stable= tough. The most frustrating part is the there is absolutely no logs to be = found. No kernel oops or what.. the server just resets and boots again.

Are there others experiencing problems like this? Do you see more frequent = server/kernel crashes on production servers?=C2=A0=C2=A0

Best regards,
=C2=A0
Roalt Zijlstra
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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <98a9fc5ab7016da7c58e95db4761eef7.squirrel@swampthing.dk> Content-Language: en_US Subject: Re: [Xen-users] Debian Testing with Xen 4.11 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" T24gMTEvNS8xOCA5OjQ0IEFNLCBUb3JiZW4gU2Nob3UgSmVuc2VuIHdyb3RlOgo+IFRoYW5rcyBm b3IgaW5mbyByZWdhcmRpbmcgYnVnLgo+IE92ZXIgdGhlIHdlZWtlbmQgSSB0aG91Z2h0IHB5Z3J1 YiBoYWQgYmVlbiBkZXByZWNhdGVkIGFuZCB0aGVuIGNvbXBsZXRlCj4gcmVtb3ZlZC4KPiAKPiBJ IGhhdmUgYSBwcm9kdWN0aW9uIHNlcnZlciB3aXRoIDMgZG9tdSwgYWxsIGJvb3RlZCB3aXRoIHB5 Z3J1Yiwgb25lIG9mCj4gdGhlbSBteSBwcmltYXJ5IHdlYiBhbmQgbWFpbCBzZXJ2ZXIuCj4gWGVu IDQuOCBpcyBvdXRzdGFuZGluZyBmb3IgcmVtb3ZhbCBpbiBhcHQsIGJ1dCBzdGlsbCB0aGVyZSwg YW5kIHB5Z3J1Ygo+IGZyb20gNC44IG1ha2UgdGhlc2UgMyBkb211IHN0YXJ0IHVwIGFmdGVyIHJl Ym9vdCBvZiBYZW4gNC4xMS4KPiBOb3cgd2FpdCBmb3IgZml4IG9uIGJ1Zywgb3IgY29udmVydCB0 aGVtIGFsbCB0byBuZXcgYm9vdCBtZXRob2QuCgpJIGNhbiByZWNvbW1lbmQgc3dpdGNoaW5nIHRv IHB2Z3J1YjIgaW5zdGVhZCBvZiBweWdydWIsIGJ1dCB0aGF0J3MgbXkKb3duIG9waW5pb24uIEl0 J3MgYSBtdWNoICJjbGVhbmVyIiBzb2x1dGlvbiB0byB0aGUgcHJvYmxlbS4KCkhhbnMKCl9fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi11c2VycyBtYWls aW5nIGxpc3QKWGVuLXVzZXJzQGxpc3RzLnhlbnByb2plY3Qub3JnCmh0dHBzOi8vbGlzdHMueGVu cHJvamVjdC5vcmcvbWFpbG1hbi9saXN0aW5mby94ZW4tdXNlcnM= From xen-users-bounces@lists.xenproject.org Tue Nov 06 18:42:20 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Tue, 06 Nov 2018 18:42:20 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gK6Hu-0000IU-KG; Tue, 06 Nov 2018 18:41:18 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gK6Hs-0000I1-KM for xen-users@lists.xen.org; Tue, 06 Nov 2018 18:41:16 +0000 X-Inumbo-ID: 89eb00f7-e1f3-11e8-9a16-bc764e045a96 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id 89eb00f7-e1f3-11e8-9a16-bc764e045a96; Tue, 06 Nov 2018 18:41:14 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gK6Hg-0005FR-Ro; Tue, 06 Nov 2018 18:41:04 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.89) (envelope-from ) id 1gK6Hg-0002Qd-P3; Tue, 06 Nov 2018 18:41:04 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.508 (Entity 5.508) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Tue, 06 Nov 2018 18:41:04 +0000 Subject: [Xen-users] Xen Security Advisory 282 v1 - guest use of HLE constructs may lock up host X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: "Xen.org security team" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-282 guest use of HLE constructs may lock up host ISSUE DESCRIPTION ================= Various Intel CPU models have an erratum listed under the title "Processor May Hang When Executing Code In an HLE Transaction". It describes a potential hang when using instructions with the XACQUIRE prefix on the host physical memory range covering the first 4 MiB starting at the 1GiB boundary. IMPACT ====== A malicious or buggy guest may cause a CPU to hang, resulting in a DoS (Denial of Service) affecting the entire host. VULNERABLE SYSTEMS ================== All Xen versions are affected. Only Intel based x86 systems are affected. Please refer to Intel documentation as to which specific CPU models are affected. AMD x86 systems as well as Arm ones are not affected. MITIGATION ========== There is no known mitigation. A BIOS update may be available for some systems, working around the issue at the firmware level. RESOLUTION ========== Applying the appropriate pair of attached patches works around this issue for the CPU models known to be affected at the time of writing. xsa282-?.patch xen-unstable xsa282-4.11-1.patch + xsa282-2.patch Xen 4.11.x, Xen 4.10.x xsa282-4.9-1.patch + xsa282-2.patch Xen 4.9.x xsa282-4.9-1.patch + xsa282-4.8-2.patch Xen 4.8.x, Xen 4.7.x $ sha256sum xsa282* 6ef64ca920a58ed9185e81fad3dfa9ca5f6316f1e72ddd4f411f3e79eaf79903 xsa282.meta ad7093e00b3d6650530c95427ef0e68880883f0cec7229b5f41c9e2dc497ffd5 xsa282-1.patch 7ce7fa105026b189500a31bd3978ec0c6fd9d7c95f688463c25ecce76366be35 xsa282-2.patch fbff734d678700864563f8214361f391c0cbda9b67ed7256535ed3db388c8feb xsa282-4.8-2.patch df833cbe9b8798104a65d44b737c46f97399b86b0ffd03c99fda4c8ecf5a353c xsa282-4.9-1.patch 68eab296a7124662cbe3c6df8835aff9b4a26160fdbe970e206a7a6ef8d27ec7 xsa282-4.11-1.patch $ NOTE REGARDING LACK OF EMBARGO ============================== The issue has been documented publicly in Specification Updates for at 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([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gKI44-0000lW-59; Wed, 07 Nov 2018 07:15:48 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gKI42-0000lR-C6 for xen-users@lists.xenproject.org; Wed, 07 Nov 2018 07:15:46 +0000 X-Inumbo-ID: eefa5da7-e25c-11e8-9a16-bc764e045a96 Received: from mail.linuxsolutions.fi (unknown [146.71.76.164]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id eefa5da7-e25c-11e8-9a16-bc764e045a96; Wed, 07 Nov 2018 07:15:41 +0000 (UTC) Received: from mail.linuxsolutions.fi (localhost [127.0.0.1]) by mail.linuxsolutions.fi (Postfix) with ESMTP id 1DD5F16028D for ; Wed, 7 Nov 2018 08:57:31 +0200 (EET) Received: from [81.209.93.154] (unknown [81.209.93.154]) by mail.linuxsolutions.fi (Postfix) with ESMTPSA id CA26B16028B for ; Wed, 7 Nov 2018 08:57:30 +0200 (EET) To: xen-users@lists.xenproject.org References: <501FA3A3-40E7-482D-B15E-D1BD7A82DAA9@janzen.onl> <0C698F19-82EB-4354-8E07-D33EC5977EAF@janzen.onl> From: johnny Strom Message-ID: Date: Wed, 7 Nov 2018 08:57:29 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Virus-Scanned: ClamAV using ClamSMTP Subject: Re: [Xen-users] Dom0 crashes without logging lately on Debian Stretch with Xen 4.8 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" T24gMTEvNi8xOCA3OjEwIFBNLCBKb2huIE5hZ2dldHMgd3JvdGU6Cj4gVGhhbmtzIHRvIGJvdGgg b2YgeW91IGZvciB5b3VyIGRldGFpbGVkIGluZm9ybWF0aW9uLiBTbyBhcyB5b3UgYm90aCBkbyAK 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Andreas Pflug Openpgp: preference=signencrypt Autocrypt: addr=pgadmin@pse-consulting.de; prefer-encrypt=mutual; keydata= xsFNBFmMKQwBEADD1CpyQexCE38SBAF/Dcs5s59mcEyWC5MiM078oAB1f+NA/THkBEX3Jwy2 tskVRP8uJYTcUHLhSIHYbVKGShrPvn6lUQ8WD1B5DuPlNwq3IfGHHLiCfHzvuT6/EfFhNrbT 3doJubXac+thrncW3+HfYl+wnoTKss2IYf3pLPJCVf7o0T60IFrcU8JpHOa9x+5vGEsODAdj W6JX7ki7NuR447Z2J5F1PupR8+0Z+9grDKh4Pc70RMvst+aFyPFBl9WpiR/wyH4FV7n6atAO VuWEuREUJo/8cV2sYrRDuNQCXX0OV+O2twmCwmRosscFBW9xhGXXxMOa6TuzVJtExa1ZjaRk BGjwgV79yfO0RofBYqpdne/7V+bM4/18zvTNPYTFcPgayJgAyMAMneauBeh5INzrKQqFjmaM BsBXSvRlQ/nRwSW0ngijdeWIT+J24mxV0NfL1CdUEdf/E91PXQcrpmtpcce3+E14hFEzgHUK 36miOgl2wFmPiNC7RwKowI+pPdIdB8cVv/tr+gGSz/6G5E1+/RS7Yg1CzKiOhZ2yNFI0sYNd j32dc4sIltcGfwf6J4Pgd+G8be/dileYvVg23T82oo/rLygrnM2IxzOuJDmWIdubhoLKrvqd HAQ7fvgwKYJVdJEFJGeEM+TaWFhtS4zzAG/4uoTjdQs+aGEmuQARAQABzSdBbmRyZWFzIFBm bHVnIDxwZmx1Z0Bwc2UtY29uc3VsdGluZy5kZT7CwXcEEwEKACECGwMFCwkIBwMFFQoJCAsF FgIDAQACHgECF4AFAlmMiDUACgkQy0pg+ikb8EnqqA/+IHuKvm95U32linNotYwUvwkbX2NQ 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multipart/mixed; boundary="===============4409424920349046976==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" This is a multi-part message in MIME format. --===============4409424920349046976== Content-Type: multipart/alternative; boundary="------------AD3AF3D8023AD4C5965BC5C1" Content-Language: de-DE This is a multi-part message in MIME format. --------------AD3AF3D8023AD4C5965BC5C1 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Am 29.10.18 um 12:57 schrieb Roalt Zijlstra | webpower: > Hi there, > > Ever since all the Meltdown and Spectre kernel updates and possibly > also Xen 4.8 updates, we experience crashes of the Dom0 just out of > the blue. Sometimes after 1 day, sometimes after a few days or even 14 > days, completely random. > > We have two Dell P730 servers and two Dell P720 servers with this > behaviour. One thing is that we updated these machine to the latest > available firmware, because that is the most secure way. Then we > installed Debian Stretch with Xen 4.8 support > > We have done serveral installs and 4 servers seem to crash pretty fast > and other don't. In the end we think that we can lead it back to the > xen-4.8.4-pre version being stable and the xen-4.8.5-pre being > unstable. This was kinda independent of the kernel that we were using > 4.14 or 4.9.0-8-amd64. This is off course all Debian package numbering. > > As last resort  we updated on one server all DomU kernels of our > Jessie servers on this Dom0 to 4.9.0 from backports instead of the > 3.16 kernel. For now that seems to work, but the crashes are random so > it could happen any time again. The idea is that these kernels are > completely spectre& meltdown unaware and might cause trouble in Xen > kernel support. I am not sure if this is true at all, but we are > pretty lost what the actual cause is. > > We also tested with CentOS and we also had these crashes there with > certain combinations of kernel/Xen. The most recent updates seem to be > more stable tough. The most frustrating part is the there is > absolutely no logs to be found. No kernel oops or what.. the server > just resets and boots again. > > Are there others experiencing problems like this? Do you see more > frequent server/kernel crashes on production servers?  Have you tried netconsole logging to a different server? that might catch that interesting single line of kernel logging that doesn't make it to disk before reboot. Regards, Andreas --------------AD3AF3D8023AD4C5965BC5C1 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
Am 29.10.18 um 12:57 schrieb Roalt Zijlstra | webpower:
Hi there,

Ever since all the Meltdown and Spectre kernel updates and possibly also Xen 4.8 updates, we experience crashes of the Dom0 just out of the blue. Sometimes after 1 day, sometimes after a few days or even 14 days, completely random.

We have two Dell P730 servers and two Dell P720 servers with this behaviour. One thing is that we updated these machine to the latest available firmware, because that is the most secure way. Then we installed Debian Stretch with Xen 4.8 support

We have done serveral installs and 4 servers seem to crash pretty fast and other don't. In the end we think that we can lead it back to the xen-4.8.4-pre version being stable and the xen-4.8.5-pre being unstable. This was kinda independent of the kernel that we were using 4.14 or 4.9.0-8-amd64. This is off course all Debian package numbering.

As last resort  we updated on one server all DomU kernels of our Jessie servers on this Dom0 to 4.9.0 from backports instead of the 3.16 kernel. For now that seems to work, but the crashes are random so it could happen any time again. The idea is that these kernels are completely spectre& meltdown unaware and might cause trouble in Xen kernel support. I am not sure if this is true at all, but we are pretty lost what the actual cause is.

We also tested with CentOS and we also had these crashes there with certain combinations of kernel/Xen. The most recent updates seem to be more stable tough. The most frustrating part is the there is absolutely no logs to be found. No kernel oops or what.. the server just resets and boots again.

Are there others experiencing problems like this? Do you see more frequent server/kernel crashes on production servers? 

Have you tried netconsole logging to a different server? that might catch that interesting single line of kernel logging that doesn't make it to disk before reboot.

Regards,

Andreas

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Hi,

I have successfully built xen 4.11 = on Ubuntu 18.04 from source. As I wanted to use the binaries on a few machi= nes I did 'make debball'.=C2=A0

How do I k= now which packages are required by my debball? I want to keep things lean a= nd not use all the packages on other machines required to build xen. For ex= ample, I had to install the yajl package on a new Ubuntu install when insta= lling the package I made previously to stop errors.

Many thanks,

Chris=C2=A0
--00000000000002dd6b057aa4da78-- --===============8649214715456046923== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLXVzZXJz IG1haWxpbmcgbGlzdApYZW4tdXNlcnNAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0 cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi11c2Vycw== --===============8649214715456046923==-- From xen-users-bounces@lists.xenproject.org Wed Nov 14 19:42:30 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Wed, 14 Nov 2018 19:42:30 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gN12V-0002oX-IA; Wed, 14 Nov 2018 19:41:27 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gN12T-0002oR-Ni for xen-users@lists.xenproject.org; Wed, 14 Nov 2018 19:41:25 +0000 X-Inumbo-ID: 43bc8103-e845-11e8-9a16-bc764e045a96 Received: from syrinx.knorrie.org (unknown [82.94.188.77]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id 43bc8103-e845-11e8-9a16-bc764e045a96; Wed, 14 Nov 2018 19:41:22 +0000 (UTC) Received: from [IPv6:2001:980:4a41:fb::12] (unknown [IPv6:2001:980:4a41:fb::12]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by syrinx.knorrie.org (Postfix) with ESMTPSA id BD8522D9FBA16; Wed, 14 Nov 2018 20:41:21 +0100 (CET) To: Chris Percol , xen-users@lists.xenproject.org References: From: Hans van Kranenburg Openpgp: preference=signencrypt Autocrypt: addr=hans@knorrie.org; prefer-encrypt=mutual; keydata= xsFNBFo2pooBEADwTBe/lrCa78zuhVkmpvuN+pXPWHkYs0LuAgJrOsOKhxLkYXn6Pn7e3xm+ ySfxwtFmqLUMPWujQYF0r5C6DteypL7XvkPP+FPVlQnDIifyEoKq8JZRPsAFt1S87QThYPC3 mjfluLUKVBP21H3ZFUGjcf+hnJSN9d9MuSQmAvtJiLbRTo5DTZZvO/SuQlmafaEQteaOswme DKRcIYj7+FokaW9n90P8agvPZJn50MCKy1D2QZwvw0g2ZMR8yUdtsX6fHTe7Ym+tHIYM3Tsg 2KKgt17NTxIqyttcAIaVRs4+dnQ23J98iFmVHyT+X2Jou+KpHuULES8562QltmkchA7YxZpT mLMZ6TPit+sIocvxFE5dGiT1FMpjM5mOVCNOP+KOup/N7jobCG15haKWtu9k0kPz+trT3NOn gZXecYzBmasSJro60O4bwBayG9ILHNn+v/ZLg/jv33X2MV7oYXf+ustwjXnYUqVmjZkdI/pt 30lcNUxCANvTF861OgvZUR4WoMNK4krXtodBoEImjmT385LATGFt9HnXd1rQ4QzqyMPBk84j roX5NpOzNZrNJiUxj+aUQZcINtbpmvskGpJX0RsfhOh2fxfQ39ZP/0a2C59gBQuVCH6C5qsY rc1qTIpGdPYT+J1S2rY88AvPpr2JHZbiVqeB3jIlwVSmkYeB/QARAQABzR5Kb2hhbm5lcyBN YXJpam4gdmFuIEtyYW5lbmJ1cmfCwZEEEwEKADsCGwMFCwkIBwMFFQoJCAsFFgIDAQACHgEC F4AWIQTib9aPwejUthlFRk7ngVcyGAwqVQUCWjawgAIZAQAKCRDngVcyGAwqVZZ3D/98GzxN iFK38eh60e9TARh4HCgEWHD14/YK6KGpzF5UXM7CkKnb0NDjM3TzeeaIYzsOJITSW6rMOm5L NcJTUmw0x4vt43yc+DFAaBNiywXWgFc6g9RpYg5X33y+jhbjDREsGMDAk89isKWo8I8+rZwl S9FSSopWkrj0wV64TRwAlTCrYaTlS56mHa9T5RJkmIY+suxRr3Xl2gcKvng2Kh2WCDHjItUF /t3DfjMCIEL18QlXieyY2w1K0h4iT93YNkEdSpElsD5lFdt7XUfy3Q89eQHtd5n21cXG9lMc fcSbmHdn0ugYF0Hu2xVKCcYwWEgLjLRJ+G4aLQW122PKVVpn15/n7KMX9hQNMH4T8krEqOpd Vdb982gx5GSa+2j44+kOFTCnREN0w15JZI8Osi48xLdPqcrMVtvq9ga8tIPebAs8IM8Mf4JY okBS5sbCGEWZSSsDSdYm/Fp39HA3AEl2nI+wnJZCdgLx5NEnCd5Ni9d6rzC8Te7SvVvA/qlo sVDZAo6MJBYgoO9lPKHYD0FWomAeOlFVjdob0G2n1xBRjroVK0JQI3jpPQoZpc1TLauUQ+kT BQwWwFlpbfBbf0+CACWiQL0YgNNiZn885h4vU0EQI/FizjWUHxVLhXt1K4+x7nkhCZYzaIFL jLqw4y8f6SF9DxRMTM8dcaIQyThkms7BTQRaOtArARAA50ylThKbq0ACHyomxjQ6nFNxa9IC p6byU9LhhKOax0GB6l4WebMsQLhVGRQ8H7DT84E7QLRYsidEbneB1ciToZkL5YFFaVxY0Hj1 wKxCFcVoCRNtOfoPnHQ5m/eDLaO4o0KKL/kaxZwTn2jnl6BQDGX1Aak0u4KiUlFtoWn/E/NI v5QbTGSwIYuzWqqYBIzFtDbiQRvGw0NuKxAGMhwXy8VP05mmNwRdyh/CC4rWQPBTvTeMwr3n l8/G+16/cn4RNGhDiGTTXcX03qzZ5jZ5N7GLY5JtE6pTpLG+EXn5pAnQ7MvuO19cCbp6Dj8f XRmI0SVXWKSo0A2C8xH6KLCRfUMzD7nvDRU+bAHQmbi5cZBODBZ5yp5CfIL1KUCSoiGOMpMi n3FrarIlcxhNtoE+ya23A+JVtOwtM53ESra9cJL4WPkyk/E3OvNDmh8U6iZXn4ZaKQTHaxN9 yvmAUhZQiQi/sABwxCcQQ2ydRb86Vjcbx+FUr5OoEyQS46gc3KN5yax9D3H9wrptOzkNNMUh Fj0oK0fX/MYDWOFeuNBTYk1uFRJDmHAOp01rrMHRogQAkMBuJDMrMHfolivZw8RKfdPzgiI5 00okLTzHC0wgSSAOyHKGZjYjbEwmxsl3sLJck9IPOKvqQi1DkvpOPFSUeX3LPBIav5UUlXt0 wjbzInUAEQEAAcLBdgQYAQoAIBYhBOJv1o/B6NS2GUVGTueBVzIYDCpVBQJaOtArAhsMAAoJ EOeBVzIYDCpV4kgP+wUh3BDRhuKaZyianKroStgr+LM8FIUwQs3Fc8qKrcDaa35vdT9cocDZ jkaGHprpmlN0OuT2PB+Djt7am2noV6Kv1C8EnCPpyDBCwa7DntGdGcGMjH9w6aR4/ruNRUGS 1aSMw8sRQgpTVWEyzHlnIH92D+k+IhdNG+eJ6o1fc7MeC0gUwMt27Im+TxVxc0JRfniNk8PU Ag4kvJq7z7NLBUcJsIh3hM0WHQH9AYe/mZhQq5oyZTsz4jo/dWFRSlpY7zrDS2TZNYt4cCfZ j1bIdpbfSpRi9M3W/yBF2WOkwYgbkqGnTUvr+3r0LMCH2H7nzENrYxNY2kFmDX9bBvOWsWpc MdOEo99/Iayz5/q2d1rVjYVFRm5U9hG+C7BYvtUOnUvSEBeE4tnJBMakbJPYxWe61yANDQub PsINB10ingzsm553yqEjLTuWOjzdHLpE4lzD416ExCoZy7RLEHNhM1YQSI2RNs8umlDfZM9L ek1+1kgBvT3RH0/CpPJgveWV5xDOKuhD8j5l7FME+t2RWP+gyLid6dE0C7J03ir90PlTEkME HEzyJMPtOhO05Phy+d51WPTo1VSKxhL4bsWddHLfQoXW8RQ388Q69JG4m+JhNH/XvWe3aQFp YP+GZuzOhkMez0lHCaVOOLBSKHkAHh9i0/pH+/3hfEa4NsoHCpyy Message-ID: Date: Wed, 14 Nov 2018 20:41:21 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en_US Subject: Re: [Xen-users] How do I know which packages Ubuntu needs for xen 4.11? X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" SGksCgpPbiAxMS8xNC8xOCA4OjIyIFBNLCBDaHJpcyBQZXJjb2wgd3JvdGU6Cj4gCj4gSSBoYXZl IHN1Y2Nlc3NmdWxseSBidWlsdCB4ZW4gNC4xMSBvbiBVYnVudHUgMTguMDQgZnJvbSBzb3VyY2Uu CgpEbyB5b3UgbWVhbiB0aGUgdXBzdHJlYW0gc291cmNlPyBJcyB0aGVyZSBhIHNwZWNpZmljIHJl YXNvbiB3aHkgeW91CndvdWxkIHdhbnQgdG8gZG8gdGhhdCBpbnN0ZWFkIG9mIGp1c3QgcmVidWls ZGluZyB0aGUgWGVuIDQuMTEgcGFja2FnZXMKdGhhdCBhcmUgaW4gRGViaWFuIHRlc3RpbmcvdW5z dGFibGUgY3VycmVudGx5PwoKPiBBcyBJCj4gd2FudGVkIHRvIHVzZSB0aGUgYmluYXJpZXMgb24g YSBmZXcgbWFjaGluZXMgSSBkaWQgJ21ha2UgZGViYmFsbCcuwqAKPiAKPiBIb3cgZG8gSSBrbm93 IHdoaWNoIHBhY2thZ2VzIGFyZSByZXF1aXJlZCBieSBteSBkZWJiYWxsPyBJIHdhbnQgdG8ga2Vl cAo+IHRoaW5ncyBsZWFuIGFuZCBub3QgdXNlIGFsbCB0aGUgcGFja2FnZXMgb24gb3RoZXIgbWFj aGluZXMgcmVxdWlyZWQgdG8KPiBidWlsZCB4ZW4uIEZvciBleGFtcGxlLCBJIGhhZCB0byBpbnN0 YWxsIHRoZSB5YWpsIHBhY2thZ2Ugb24gYSBuZXcKPiBVYnVudHUgaW5zdGFsbCB3aGVuIGluc3Rh bGxpbmcgdGhlIHBhY2thZ2UgSSBtYWRlIHByZXZpb3VzbHkgdG8gc3RvcCBlcnJvcnMuCgpIYW5z CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tdXNl cnMgbWFpbGluZyBsaXN0Clhlbi11c2Vyc0BsaXN0cy54ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xp c3RzLnhlbnByb2plY3Qub3JnL21haWxtYW4vbGlzdGluZm8veGVuLXVzZXJz From xen-users-bounces@lists.xenproject.org Wed Nov 14 22:04:59 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Wed, 14 Nov 2018 22:04:59 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gN3GL-0007aX-Rb; Wed, 14 Nov 2018 22:03:53 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gN3GJ-0007aS-UK for xen-users@lists.xenproject.org; Wed, 14 Nov 2018 22:03:51 +0000 X-Inumbo-ID: 2b0fa254-e859-11e8-9a16-bc764e045a96 Received: from mail-ot1-x330.google.com (unknown [2607:f8b0:4864:20::330]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id 2b0fa254-e859-11e8-9a16-bc764e045a96; Wed, 14 Nov 2018 22:03:50 +0000 (UTC) Received: by mail-ot1-x330.google.com with SMTP id u16so15929624otk.8 for ; Wed, 14 Nov 2018 14:03:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=B3YvtcCHcQHYfMC03W3twd247+kQZjTbodsw/t5qMAA=; b=o4fI0uhTLShTAKKgzOdXP0JBDPeJL6KizSEVcHllLZEdcFJa2sYzea/yPDxz8vsMR4 xryYvSoAweoScxt5M/xeRkP12GL11mbmYBiIzw6NkvlwgJl3be28KcTjnS0cCW0+On/C Ewhur55xQeWmyJ8vECw97uJEoYoTL9Rm0egxqW+05jSV78aAhEpHsMU9GRjpg+kU2hl8 881Ef1kylpO41pNN0EJoZIl35bARKttKb3DC9cC5rW8hUJ/4HrDFn32D3cMyXaVgc2t1 ZgBPct1+xxJD0KQgvgCPOC7+aQd31Q2qQdZskuIWJwaOUTb+Efwbnh8xpo1kzaKOvFr7 jT3g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=B3YvtcCHcQHYfMC03W3twd247+kQZjTbodsw/t5qMAA=; b=M7Y6loXtmb1PsZfikDu1JEbAIh7WDFra9GZBEyV+VJbuy0IUJsXy4OMRvw5o/NT7Yu wldV84WVMeY/S9oPu0zh5592Ofoa2mi1+CbmJ6kOQ/40jC7+/0G+MBQhWoQVUr1G+ZPT YUVRb2fvWjgpaBbhwErIOn5vNxVtXUCUYqzpUco20HLoUembB0Pun1/Ze+kBPy5VBN84 QnbOsTxC/mJDL/HgUo8WZtYXvccHLDcomBdzyeti7tEvfjk0ytKS6fHvqcn76uiT9aJo IZvCnK3d5rtGsFKrH3Ajp0s13Uau/7zOUEngPQhtAIh80RCNSiAD+/qJ1pqOcWfadNzu WPZQ== X-Gm-Message-State: AGRZ1gLumrV121n82R9L8HqQ0Xv7XmvDTkog3zsPxqBuvqU2T2r3bJ/c MFRGJ7WmLGJ2iH1/q0/wJICMpdFebu4rG0Bg40E= X-Google-Smtp-Source: AJdET5e7cySpNpwblPufVOIFIdboRhV++9e7xdrSHi+1YK4KCBYdO5CCKdwMC6K9tuJBKdFVWL1eaVdBbypkJVuTYmo= X-Received: by 2002:a9d:ecd:: with SMTP id 71mr2224777otj.155.1542233030467; Wed, 14 Nov 2018 14:03:50 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Chris Percol Date: Wed, 14 Nov 2018 22:03:39 +0000 Message-ID: To: hans@knorrie.org Subject: Re: [Xen-users] How do I know which packages Ubuntu needs for xen 4.11? X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-users@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============5505190339660153084==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============5505190339660153084== Content-Type: multipart/alternative; boundary="000000000000f1261c057aa71b76" --000000000000f1261c057aa71b76 Content-Type: text/plain; charset="UTF-8" Hans, I am happy for your guidance as I am not well versed in such matters. I currently look after a dozen Xenservers and want to experiment with a Xen hypervisor on Ubuntu 18.04. Which packaged version of Xen would you recommend I run on Ubuntu 18.04 and where do I get it? I have no particular requirements. My current setup is Xenservers using local storage and Windows/Ubuntu/FreeBSD/CoreOS VMs. I falsely presumed today the Xen kernel I had was crashing based on using relatively new CPUs when it appears to be the old chestnut of UEFI boot. Coupled with the fact Ubuntu 18.04 was running xen 4.9 in the universe rather than main repos I started tinkering with building 4.11 from upstream source. Thanks, Chris On Wed, Nov 14, 2018 at 7:41 PM Hans van Kranenburg wrote: > Hi, > > On 11/14/18 8:22 PM, Chris Percol wrote: > > > > I have successfully built xen 4.11 on Ubuntu 18.04 from source. > > Do you mean the upstream source? Is there a specific reason why you > would want to do that instead of just rebuilding the Xen 4.11 packages > that are in Debian testing/unstable currently? > > > As I > > wanted to use the binaries on a few machines I did 'make debball'. > > > > How do I know which packages are required by my debball? I want to keep > > things lean and not use all the packages on other machines required to > > build xen. For example, I had to install the yajl package on a new > > Ubuntu install when installing the package I made previously to stop > errors. > > Hans > --000000000000f1261c057aa71b76 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hans,

I am happy for your guidance as I= am not well versed in such matters. I currently look after a dozen Xenserv= ers and want to experiment with a Xen hypervisor on Ubuntu 18.04.

Which packaged version of Xen would you recommend I run on = Ubuntu 18.04 and where do I get it? I have no particular requirements. My c= urrent setup is Xenservers using local storage and Windows/Ubuntu/FreeBSD/C= oreOS VMs.

I falsely presumed today the Xen kernel= I had was crashing based on using relatively new CPUs when it appears to b= e the old chestnut of UEFI boot. Coupled with the fact Ubuntu 18.04 was run= ning xen 4.9 in the universe rather than main repos I started tinkering wit= h building 4.11 from upstream source.

Thanks,

Chris

On Wed, Nov 14, 2018 at 7:41 PM Hans van Kranenburg <hans@knorrie.org> wrote:
Hi,

On 11/14/18 8:22 PM, Chris Percol wrote:
>
> I have successfully built xen 4.11 on Ubuntu 18.04 from source.

Do you mean the upstream source? Is there a specific reason why you
would want to do that instead of just rebuilding the Xen 4.11 packages
that are in Debian testing/unstable currently?

> As I
> wanted to use the binaries on a few machines I did 'make debball&#= 39;.=C2=A0
>
> How do I know which packages are required by my debball? I want to kee= p
> things lean and not use all the packages on other machines required to=
> build xen. For example, I had to install the yajl package on a new
> Ubuntu install when installing the package I made previously to stop e= rrors.

Hans
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X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: "xen-users@lists.xenproject.org" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" SGksDQoNCmlmIHlvdSBidWlsZCBmcm9tIHVwc3RyZWFtIHNvdXJjZSwgeW91IG5lZWQgdG8gdHJ5 IHlvdXJzZWxmIHdoaWNoIHBhY2thZ2VzIGFyZSBuZWVkZWQsIGFzIG9mIHRoZXJlIGFyZSBubyBk ZXBlbmRlbmNpZXMgYWRkZWQgdG8gdGhlIHJlc3VsdGluZyBkZWIgZmlsZS4gTmVpdGhlciBhIHdv cmtpbmcgY29uZmlndXJhdGlvbiBmb3Igc3lzdGVtZC4NCg0KSSBoYXZlIG5vdCB5ZXQgdHJpZWQg dG8gY2hhbmdlIHRoaXMgZm9yIG15IHNldHVwLCBidXQgSSBhbHJlYWR5IG1hZGUgYSBtZXRhcGFj a2FnZSBmb3IgdGhlIHVwc3RyZWFtIGtlcm5lbCBhbmQgaWYgeW914oCYcmUgYnVpbGRpbmcgeW91 ciBvd24gZGViIHJlcG8gZm9yIHRoaXMgcHVycG9zZSBhIG1ldGFwYWNrYWdlIHdvdWxkIGJlIGFu IGVhc3kgb3B0aW9uIHRvIGluc3RhbGwgZGVwZW5kaW5nIHBhY2thZ2VzLg0KDQpJIGFtIHVzaW5n IERlYmlhbiA5IHN0cmVjaCBhcyBiYXNpcyBmb3IgbXkgY3VzdG9tIGJ1aWxkIHNldHVwIGFuZCB0 aGVyZSBsaWJ5YWpsMiBpcyB0aGUgb25seSBkZXBlbmRlbmN5IGZvciBpbnN0YWxsYXRpb24uDQoN Cg0KUmVnYXJkcywNCiAgICBWb2xrZXINCg0KDQo+IEFtIDE0LjExLjIwMTggdW0gMjA6NDMgc2No cmllYiBDaHJpcyBQZXJjb2wgPGNocmlzLnBlcmNvbEBnbWFpbC5jb20+Og0KPiANCj4gSGksDQo+ IA0KPiBJIGhhdmUgc3VjY2Vzc2Z1bGx5IGJ1aWx0IHhlbiA0LjExIG9uIFVidW50dSAxOC4wNCBm cm9tIHNvdXJjZS4gQXMgSSB3YW50ZWQgdG8gdXNlIHRoZSBiaW5hcmllcyBvbiBhIGZldyBtYWNo aW5lcyBJIGRpZCAnbWFrZSBkZWJiYWxsJy4gDQo+IA0KPiBIb3cgZG8gSSBrbm93IHdoaWNoIHBh Y2thZ2VzIGFyZSByZXF1aXJlZCBieSBteSBkZWJiYWxsPyBJIHdhbnQgdG8ga2VlcCB0aGluZ3Mg bGVhbiBhbmQgbm90IHVzZSBhbGwgdGhlIHBhY2thZ2VzIG9uIG90aGVyIG1hY2hpbmVzIHJlcXVp cmVkIHRvIGJ1aWxkIHhlbi4gRm9yIGV4YW1wbGUsIEkgaGFkIHRvIGluc3RhbGwgdGhlIHlhamwg cGFja2FnZSBvbiBhIG5ldyBVYnVudHUgaW5zdGFsbCB3aGVuIGluc3RhbGxpbmcgdGhlIHBhY2th Z2UgSSBtYWRlIHByZXZpb3VzbHkgdG8gc3RvcCBlcnJvcnMuDQo+IA0KPiBNYW55IHRoYW5rcywN Cj4gDQo+IENocmlzIA0KPiBfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fXw0KPiBYZW4tdXNlcnMgbWFpbGluZyBsaXN0DQo+IFhlbi11c2Vyc0BsaXN0cy54ZW5w cm9qZWN0Lm9yZw0KPiBodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3JnL21haWxtYW4vbGlzdGlu Zm8veGVuLXVzZXJzDQpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fXwpYZW4tdXNlcnMgbWFpbGluZyBsaXN0Clhlbi11c2Vyc0BsaXN0cy54ZW5wcm9qZWN0Lm9y ZwpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3JnL21haWxtYW4vbGlzdGluZm8veGVuLXVzZXJz From xen-users-bounces@lists.xenproject.org Thu Nov 15 19:17:39 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Thu, 15 Nov 2018 19:17:39 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gNN7s-0003kn-4U; 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Thu, 15 Nov 2018 19:16:22 +0000 Date: Thu, 15 Nov 2018 19:16:17 +0000 (UTC) From: Mark Pryor To: Chris Percol Message-ID: <735025335.1223500.1542309377703@mail.yahoo.com> In-Reply-To: References: MIME-Version: 1.0 X-Mailer: WebService/1.1.12729 YMailNorrin Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0 Content-Length: 4404 Subject: Re: [Xen-users] How do I know which packages Ubuntu needs for xen 4.11? X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Xen-users Content-Type: multipart/mixed; boundary="===============8774821480274463028==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============8774821480274463028== Content-Type: multipart/alternative; boundary="----=_Part_1223499_1682390416.1542309377701" Content-Length: 3827 ------=_Part_1223499_1682390416.1542309377701 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable you can find a hint for the build-depends here: http://xenbits.xen.org/gitweb/?p=3Dxen.git;a=3Dshortlog;h=3Drefs/heads/stag= ing-4.11 navigate to tree/automation/build/ubuntu/xenial.dockerfile/raw its not exactly bionic, but its a good start. The `make debball` is a binary build. To include all the build-deps you nee= d to include a debian/control file inside a debian delta, part of a source = build. PryMar56 =20 On Wednesday, November 14, 2018, 11:22:46 AM PST, Chris Percol wrote: =20 =20 Hi, I have successfully built xen 4.11 on Ubuntu 18.04 from source. As I wanted= to use the binaries on a few machines I did 'make debball'.=C2=A0 How do I know which packages are required by my debball? I want to keep thi= ngs lean and not use all the packages on other machines required to build x= en. For example, I had to install the yajl package on a new Ubuntu install = when installing the package I made previously to stop errors. Many thanks, Chris=C2=A0_______________________________________________ Xen-users mailing list Xen-users@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-users =20 ------=_Part_1223499_1682390416.1542309377701 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit
you can find a hint for the build-depends here:
http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/staging-4.11

navigate to tree/automation/build/ubuntu/xenial.dockerfile/raw

its not exactly bionic, but its a good start.

The `make debball` is a binary build. To include all the build-deps you need to include a debian/control file inside a debian delta, part of a source build.

PryMar56


On Wednesday, November 14, 2018, 11:22:46 AM PST, Chris Percol <chris.percol@gmail.com> wrote:


Hi,

I have successfully built xen 4.11 on Ubuntu 18.04 from source. As I wanted to use the binaries on a few machines I did 'make debball'. 

How do I know which packages are required by my debball? I want to keep things lean and not use all the packages on other machines required to build xen. For example, I had to install the yajl package on a new Ubuntu install when installing the package I made previously to stop errors.

Many thanks,

Chris 
_______________________________________________
Xen-users mailing list
Xen-users@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-users
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Sat, 17 Nov 2018 13:53:45 +0000 (UTC) Received: from [10.9.9.1] (unknown [188.130.155.155]) by mx.nethence.com (Postfix) with ESMTPSA id C16CC10A4BD for ; Sat, 17 Nov 2018 16:39:37 +0300 (MSK) To: xen-users@lists.xenproject.org From: pierre-philipp braun Message-ID: <8d64530f-3007-ebee-3d98-f15881926b7f@nethence.com> Date: Sat, 17 Nov 2018 16:37:21 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 Content-Language: en-US Subject: [Xen-users] testing full power X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" SGVsbG8KCkkgYW0gdHJ5aW5nIHRvIGRldGVybWluZSBpZiBnaXZpbmcgYXMgbXVjaCBjb3JlcyBh cyB0aGVyZSBhcmUgcGh5c2ljYWwKb25lcywgdG8gc2V2ZXJhbCAtLS0gcG9zc2libHkgYSBsb3Qg b2YgLS0tIGd1ZXN0cywgaXMgYSBiYWQgb3IgYW4KYWNjZXB0YWJsZSBwcmFjdGljZS4gIEZvciB0 aGF0IHB1cnBvc2UsIEkgc3RhcnRlZCBzb21lIHRlc3RzLiAgT24gYSAxNgpYZW9uIHNlcnZlciwg YSBndWVzdCBhbG9uZSBpcyBhYmxlIHRvIHBlcmZvcm0gYWJvdXQgMjk4NCw2OCBldmVudHMgcGVy CnNlY29uZCAoc3lzYmVuY2ggY3B1IHRlc3QpLgoKV2hlbiBzaGFyaW5nIHRoZSBzYW1lIHRlc3Qg YWNyb3NzIHRocmVlIGd1ZXN0cywgdGhlIGxvYWQgaXMgZmFpcmx5CnNoYXJlZCBhcyBsb2FkMSBs b2FkMiBsb2FkMyByZXNwLiBtYWtlIGl0IHVwIHRvIDEzMTIsMjEgMTMxNiwyMSAxMzM1LDQ4CmV2 ZW50cy4gIFNhbWUgZ29lcyB3aGVuIGRvaW5nIHN5c2JlbmNoIG9uIG9ubHkgbG9hZDEgd2hpbGUg bG9hZDIgYW5kCmxvYWQzIGhhdmUgYmVpbmcgc3RyZXNzZWQgYnkgYHN0cmVzc2AgaW5zdGVhZC4g IExvYWQxIHRoZW4gbWFrZXMgaXQgdXAKdG8gMTIzMyw0MyBldmVudHMvc2Vjb25kLiAgVGhvc2Ug cmVzdWx0cyBhcmUgYXZlcmFnZWQgb3ZlciB0aHJlZQppdGVyYXRpb25zLCBhbHRob3VnaCB0aGUg dmFyaWF0aW9ucyBhcmUgbmVnbGlnaWJsZS4KCk5vdyB3aGVuIHBlcmZvcm1pbmcgMTEgZ3Vlc3Rz LCAxMCBvZiB0aGVtIGRvaW5nIGBzdHJlc3NgIGFuZCBgbG9hZDFgCmRvaW5nIGBzeXNiZW5jaGAu ICBMb2FkMSByZXBvcnRzLAoKICAgIGV2ZW50cyBwZXIgc2Vjb25kOiAgIDM0MC42OQogICAgZXZl bnRzIHBlciBzZWNvbmQ6ICAgMzQxLjM1CiAgICBldmVudHMgcGVyIHNlY29uZDogICAzMzkuMTgK ICAgIGF2ZyAzNDAsNDEKClRoaXMgbG9va3MgcHJldHR5IGdvb2QuICBJdCBpcyBhY3R1YWxseSBt b3JlIHRoYW4gZXhwZWN0ZWQsIGFzIHdlIGdldAptb3JlIGV2ZW50cyB0aGFuIHRoZSByZWZlcmVu Y2UgMjk4NCw2OCByZXN1bHQgZGl2aWRlZCBieSAxNiAoMTg2LDU0KS4KU2ltaWxhcmx5LCB3ZSBh bHJlYWR5IG9idGFpbmVkIGEgbGFyZ2VyIGFtb3VudCBvZiBldmVudHMgd2hlbiBzdHJlc3NpbmcK dGhyZWUgZ3Vlc3RzIGF0IGEgdGltZS4gIEhvdyBjb21lPwoKSXMgdGhlcmUgYSB0aGVvcmV0aWNh bCBsaW1pdCB3aGVyZSB0aGUgbnVtYmVyIG9mIGd1ZXN0cyB0aGF0IGFyZSB1c2luZwphbGwgdGhl IGNvcmVzIHdvdWxkIHN0YXJ0IHNob3dpbmcgdXAgYW4gb3ZlcmFsbCBkZWdyYWRhdGlvbj8gIE9y IGNhbiBJCmp1c3QgZ2l2ZSBmdWxsIGNwdSBwb3dlciB0byBhbGwgdGhlIGd1ZXN0cz8gIChJIGFt IGFzc3VtaW5nIEkgc3RpbGwKc29tZWhvdyBoYXZlIGNvbnRyb2wgb3ZlciB0aG9zZSwgb3RoZXJ3 aXNlIGl0IGdldHMgaGFyZCB0byBwcmV2ZW50IGFidXNlCm9mIHRoYXQgcG93ZXIgb3IgZml4IGZh aWx1cmVzKQoKSSBhbHNvIGRpZCBzb21lIHRlc3Qgb24gYW5vdGhlciBob3N0IHRoYXQgaGFzIDEy IGNvcmVzIGluc3RlYWQgb2YgMTYsCmFuZCB0aGVyZSB3YXMgbm8gZGlmZmVyZW5jZSBpbiBwZXJm b3JtYW5jZSB3aGVuIGJlbmNoLW1hcmtpbmcgdGhlIHNhbWUKZ3Vlc3Qgb24gMTYgdnMgMTIgVkNQ VXMuICBXaXRoIDE2IFZDUFVzIHdlIGdvdCAyNDg1LDAxIGV2ZW50cy9zZWMuICBXaXRoCjEyIFZD UFVzIHdlIGdvdCAyNDc5LDI2IGV2ZW50cy9zZWMuCgpJdCBmZWVscyBsaWtlIG92ZXItY29tbWl0 aW5nIHRoZSBudW1iZXIgb2YgVkNQVXMgaXMgYWN0dWFsbHkgaW5jcmVhc2luZwp0aGUgb3ZlcmFs bCBwZXJmb3JtYW5jZS4KClRoaXMgaXMgWGVuIDQuMTEgd2l0aCB0aGUgZGVmYXVsdCBDcmVkaXQg Q1BVIHNjaGVkdWxlciBhbmQgZG9tMC9kb21VCjQuMTguMTYuICBUaGUgaG9zdCBoYXMgMTYgWGVv biBjb3JlcyBhbmQgc3RyZXNzaW5nIHRoZSBndWVzdHMgd2VudCBhcwpmb2xsb3dzLAoKICAgIHN5 c2JlbmNoIC0tdGhyZWFkcz0xNiAtLXRlc3Q9Y3B1IC0tY3B1LW1heC1wcmltZT0yMDAwMCBydW4K ICAgIHN0cmVzcyAtLWNwdSAxNgoKQXMgYSBzaWRlIG5vdGUsIEkgd291bGQgcmVtaW5kIHRob3Nl IHdobyB3YW50IHRvIHBsYXkgd2l0aCB0aGlzIGF0IGhvbWUsCnRvIE5PVCBGT1JHRVQgdG8ga2ls bCB0aG9zZSBwcm9jZXNzZXMgYWZ0ZXIgdGVzdGluZy4KCi1waWVycmUKCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi11c2VycyBtYWlsaW5nIGxpc3QK WGVuLXVzZXJzQGxpc3RzLnhlbnByb2plY3Qub3JnCmh0dHBzOi8vbGlzdHMueGVucHJvamVjdC5v cmcvbWFpbG1hbi9saXN0aW5mby94ZW4tdXNlcnM= From xen-users-bounces@lists.xenproject.org Tue Nov 20 13:27:33 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Tue, 20 Nov 2018 13:27:33 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP638-000435-20; Tue, 20 Nov 2018 13:26:42 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP634-000414-Ov for xen-users@lists.xen.org; Tue, 20 Nov 2018 13:26:38 +0000 X-Inumbo-ID: e7e98190-ecc7-11e8-a5d6-12d6303a7972 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id e7e98190-ecc7-11e8-a5d6-12d6303a7972; Tue, 20 Nov 2018 13:26:37 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP62r-0006nP-0d; Tue, 20 Nov 2018 13:26:25 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.89) (envelope-from ) id 1gP62q-0000ct-UJ; Tue, 20 Nov 2018 13:26:24 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.508 (Entity 5.508) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Tue, 20 Nov 2018 13:26:24 +0000 Subject: [Xen-users] Xen Security Advisory 276 v2 - resource accounting issues in x86 IOREQ server handling X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: "Xen.org security team" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-276 version 2 resource accounting issues in x86 IOREQ server handling UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Allocation of pages used to communicate with external emulators did not follow certain principles that are required for proper life cycle management of guest exposed pages. IMPACT ====== A compromised DM stubdomain may cause Xen to crash, resulting in a DoS (Denial of Service) affecting the entire host. Privilege escalation as well as information leaks cannot be ruled out. VULNERABLE SYSTEMS ================== Only Xen 4.11 is affected by this vulnerability. Xen 4.10 and older are not affected by this vulnerability. Only systems running HVM guests with their devicemodels in a stubdomain are considered vulnerable. Note that attackers also need to exploit the devicemodel in order to have access to this vulnerability. Arm guests cannot leverage this vulnerability. MITIGATION ========== Running only PV guests will avoid this vulnerability. (The security of a Xen system using stub domains is still better than with a qemu-dm running as an unrestricted dom0 process. Therefore users with these configurations should not switch to an unrestricted dom0 qemu-dm.) CREDITS ======= This issue was discovered by Julien Grall of ARM. RESOLUTION ========== Applying the appropriate set of attached patches resolves this issue. xsa276/*.patch xen-unstable xsa276-4.11/*.patch Xen 4.11.x $ sha256sum xsa276* xsa276*/* efe9f031c5646b111cbfbe35141a7d99eb31ead07c1c6051145abbd9a3def5b9 xsa276.meta 7f77225e3de780a2507714caab5870664634bf9f76215547bebd31a6399a86ef xsa276-4.11/0001-x86-hvm-ioreq-fix-page-referencing.patch c93c66090009833cd11fabe72b523cbdb3467fa104cc97d1855d365881aa7f8e xsa276-4.11/0002-x86-hvm-ioreq-use-ref-counted-target-assigned-shared.patch ef8b89375866821f4a612f600d10834bf65d811b1784a4ee0fde4a3a409501e0 xsa276/0001-x86-hvm-ioreq-fix-page-referencing.patch 75398ec343b9aaebf0c7dc0c5ef5ed7a3f3be0959f1519db5c7f32c44e7a54d3 xsa276/0002-x86-hvm-ioreq-use-ref-counted-target-assigned-shared.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLXVzZXJz IG1haWxpbmcgbGlzdApYZW4tdXNlcnNAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0 cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi11c2Vycw== --=separator-- From xen-users-bounces@lists.xenproject.org Tue Nov 20 13:27:33 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Tue, 20 Nov 2018 13:27:33 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP633-00040K-Jm; Tue, 20 Nov 2018 13:26:37 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP632-0003zZ-4h for xen-users@lists.xen.org; Tue, 20 Nov 2018 13:26:36 +0000 X-Inumbo-ID: e5fe1346-ecc7-11e8-9406-12d6303a7972 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id e5fe1346-ecc7-11e8-9406-12d6303a7972; Tue, 20 Nov 2018 13:26:34 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP62p-0006nJ-Ey; Tue, 20 Nov 2018 13:26:23 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.89) (envelope-from ) id 1gP62p-0000ba-Bx; Tue, 20 Nov 2018 13:26:23 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.508 (Entity 5.508) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Tue, 20 Nov 2018 13:26:23 +0000 Subject: [Xen-users] Xen Security Advisory 275 v2 - insufficient TLB flushing / improper large page mappings with AMD IOMMUs X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: "Xen.org security team" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-275 version 2 insufficient TLB flushing / improper large page mappings with AMD IOMMUs UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= In order to be certain that no undue access to memory is possible anymore after IOMMU mappings of this memory have been removed, Translation Lookaside Buffers (TLBs) need to be flushed after most changes to such mappings. Xen bypassed certain IOMMU flushes on AMD x86 hardware. Furthermore logic exists Xen to re-combine small page mappings into larger ones. Such re-combination could have occured in cases when it was not really safe/correct to do so. IMPACT ====== A malicious or buggy guest may be able to escalate its privileges, may cause a Denial of Service (DoS) affecting the entire host, or may be able to access data it is not supposed to access (information leak). VULNERABLE SYSTEMS ================== Xen versions from at least 3.2 onwards are affected. Note that the situation is worse in 4.1 and earlier, in that there's no flushing of the TLB at all. Only systems with AMD x86 hardware with enabled IOMMU are affected. ARM and Intel x86 systems, and AMD x86 systems without enabled IOMMU, are not affected. Only systems where physical PCI devices are assigned to untrusted guests are vulnerable. MITIGATION ========== There is no known mitigation for affected system/guest combinations. CREDITS ======= This issue was discovered by Paul Durrant of Citrix. RESOLUTION ========== Applying the appropriate set of attached patches resolves this issue. xsa275-?.patch xen-unstable xsa275-4.11-?.patch Xen 4.11.x ... Xen 4.8.x xsa275-4.7-?.patch Xen 4.7.x $ sha256sum xsa275* b5a02598cd2cffcc2cb59c724eeabb50220fa55f2cbe571726a5228909bf7bfe xsa275.meta 7a3360e61fbb088f7d9f2b92921c9dceb08a1e01563c42ba4cf4a9999fe42fc4 xsa275-1.patch 4783a3abd2d87386ce9a7b790666ad398c5e027a6a146fce6424f0bcbfd8a7c6 xsa275-2.patch 49844d06f24ea129f1a501b4b0d5cb6ec3b288f3a2b41377ce793cc6fc81a788 xsa275-4.7-1.patch 7ea8bf2ff2c8c92cb064a70959a1148229c4577109015bd5aab72603ccb8f7e3 xsa275-4.7-2.patch 15d1aa7528368ed92caf8ea9baf77a406e1de26d0697dafd8a85da0d66eb95dc xsa275-4.11-1.patch 0806e8c904ac9e8eb89404dffd227fcd56da84b7eb0150ee1e9b4bee54a05b4e xsa275-4.11-2.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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mail.xenproject.org (unknown [104.130.215.37]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id e77f340c-ecc7-11e8-bce3-12d6303a7972; Tue, 20 Nov 2018 13:26:36 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP62u-0006nm-3L; Tue, 20 Nov 2018 13:26:28 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.89) (envelope-from ) id 1gP62u-0000f9-0t; Tue, 20 Nov 2018 13:26:28 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.508 (Entity 5.508) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Tue, 20 Nov 2018 13:26:28 +0000 Subject: [Xen-users] Xen Security Advisory 279 v2 - x86: DoS from attempting to use INVPCID with a non-canonical addresses X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: "Xen.org security team" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-279 version 2 x86: DoS from attempting to use INVPCID with a non-canonical addresses UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= The INVPCID instruction raises #GP[0] if an attempt is made to invalidate a non-canonical address. Older flushing mechanisms such as INVLPG tolerate this without error, and perform no action. There is one guest accessible path in Xen where a non-canonical address was passed into the TLB flushing code. This previously had no ill effect, but became vulnerable with the introduction of PCID to reduce the performance hit from the Meltdown mitigations. IMPACT ====== A buggy or malicious PV guest can crash the host. VULNERABLE SYSTEMS ================== Only hardware which supports the INVPCID instruction is vulnerable. This is available on Intel Haswell processors and later. AMD x86 processors are not known to support this instruction, and ARM processors are entirely unaffected. Only versions of Xen with PCID support are vulnerable. Support first appeared in Xen 4.11 but was backported to the stable trees as part of the Meltdown (XSA-254 / CVE-2017-5754) fixes. Xen 4.10.2, 4.9.3, 4.8.4 as well as the stable-4.7 and 4.6 branches are vulnerable. The vulnerability is only exposed to 64-bit PV guests. 32-bit PV guests, as well as HVM/PVH guests cannot exploit the vulnerability. MITIGATION ========== Booting Xen with `pcid=0` or `invpcid=0` on the command line will work around the issue. Alternatively, running untrusted 64bit PV guests inside xen-shim will work around the issue. CREDITS ======= This issue was discovered by Matthew Daley. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa279.patch xen-unstable, Xen 4.11.x, Xen 4.10.x xsa279-4.9.patch Xen 4.9.x ... 4.7.x $ sha256sum xsa279* 40319fcf33348176eb14d7fc7c68c255cc7291013242ea444de6d00602024a11 xsa279.meta 0c1d50effe6645051a15dd83af57088dd4a055e26a23b1fa9e6c3722a7973f5d xsa279.patch fd34f29bc7e53359585135408cbbd12e12a003f59b135e81cc44186c5cddd40d xsa279-4.9.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLXVzZXJz IG1haWxpbmcgbGlzdApYZW4tdXNlcnNAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0 cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi11c2Vycw== --=separator-- From xen-users-bounces@lists.xenproject.org Tue Nov 20 13:27:33 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Tue, 20 Nov 2018 13:27:33 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP636-00042W-Qw; Tue, 20 Nov 2018 13:26:40 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP634-00040w-NA for xen-users@lists.xen.org; Tue, 20 Nov 2018 13:26:38 +0000 X-Inumbo-ID: e7dc972d-ecc7-11e8-9a16-bc764e045a96 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id e7dc972d-ecc7-11e8-9a16-bc764e045a96; Tue, 20 Nov 2018 13:26:37 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP62s-0006nV-IJ; Tue, 20 Nov 2018 13:26:26 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.89) (envelope-from ) id 1gP62s-0000dz-Ff; Tue, 20 Nov 2018 13:26:26 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.508 (Entity 5.508) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Tue, 20 Nov 2018 13:26:26 +0000 Subject: [Xen-users] Xen Security Advisory 277 v2 - x86: incorrect error handling for guest p2m page removals X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: "Xen.org security team" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-277 version 2 x86: incorrect error handling for guest p2m page removals UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= The internal function querying a domain's p2m table grabs the p2m lock by default, so that the answer to the query remains true until the caller can act on that information; it is up to the caller then to release the lock. Unfortunately, certain failure paths don't release the lock. IMPACT ====== A malicious or buggy guest may cause a deadlock, resulting in a DoS (Denial of Service) affecting the entire host. VULNERABLE SYSTEMS ================== Xen 4.11 and onward are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only systems running untrusted HVM or PVH guests are vulnerable. Systems running only PV guests are not vulnerable. MITIGATION ========== Running only PV guests will avoid this vulnerability. CREDITS ======= This issue was discovered by Paul Durrant of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa277.patch xen-unstable, Xen 4.11.x $ sha256sum xsa277* 576cdc05975e43698624b88f7290119dd702b3db8f30f3219754d992d7fef0c6 xsa277.meta c9025e1daaec4081a61f1ed7b96e69cfe8e35bdd5b4fcc0fadc98f71c2e243e2 xsa277.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. 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charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLXVzZXJz IG1haWxpbmcgbGlzdApYZW4tdXNlcnNAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0 cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi11c2Vycw== --=separator-- From xen-users-bounces@lists.xenproject.org Tue Nov 20 13:32:03 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Tue, 20 Nov 2018 13:32:03 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP67K-0006C4-Ks; Tue, 20 Nov 2018 13:31:02 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP67I-0006BG-Ku for xen-users@lists.xen.org; Tue, 20 Nov 2018 13:31:00 +0000 X-Inumbo-ID: 83c5dd8e-ecc8-11e8-b8c0-12d6303a7972 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 83c5dd8e-ecc8-11e8-b8c0-12d6303a7972; Tue, 20 Nov 2018 13:30:58 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gP677-0006vZ-AN; Tue, 20 Nov 2018 13:30:49 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.89) (envelope-from ) id 1gP677-00025q-7n; Tue, 20 Nov 2018 13:30:49 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.508 (Entity 5.508) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Tue, 20 Nov 2018 13:30:49 +0000 Subject: [Xen-users] Xen Security Advisory 280 v2 - Fix for XSA-240 conflicts with shadow paging X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: "Xen.org security team" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-280 version 2 Fix for XSA-240 conflicts with shadow paging UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= The fix for XSA-240 introduced a new field into the control structure associated with each page of RAM. This field was added to a union, another member of which is used when Xen uses shadow paging for the guest. During migration, or with the L1TF (XSA-273) mitigation for PV guests in effect, the two uses conflict. IMPACT ====== A malicious or buggy x86 PV guest may cause Xen to crash, resulting in a DoS (Denial of Service) affecting the entire host. Privilege escalation as well as information leaks cannot be ruled out. VULNERABLE SYSTEMS ================== All Xen versions from at least 3.2 onwards are vulnerable. Earlier versions have not been checked. Only x86 systems are affected. ARM systems are not affected. Only Xen versions with the XSA-240 fixes applied are vulnerable. Only Xen versions which permit linear page table use by PV guests are vulnerable. Only x86 PV guests can leverage this vulnerability. x86 HVM guests cannot leverage this vulnerability. MITIGATION ========== Not permitting linear page table use by PV guests avoids the vulnerability. This can be done both at build time, by turning off the PV_LINEAR_PT configure option, or at runtime, by passing specifying "pv-linear-pt=0" on the hypervisor command line. On systems where the guest kernel is controlled by the host rather than guest administrator, running only kernels which have themselves been hardened against L1TF _and_ avoiding live migrating or snapshotting PV guests will generally prevent this issue being triggered. However untrusted guest administrators can still trigger it unless further steps are taken to prevent them from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. Running only HVM guests will avoid this vulnerability. CREDITS ======= This issue was discovered by the security team of Prgmr.com. RESOLUTION ========== Applying the appropriate pair of attached patches resolves this issue. xsa280-?.patch xen-unstable xsa280-1.patch + xsa280-4.11-2.patch Xen 4.11.x xsa280-1.patch + xsa280-4.10-2.patch Xen 4.10.x xsa280-4.9-1.patch + xsa280-4.10-2.patch Xen 4.9.x, Xen 4.8.x xsa280-4.9-1.patch + xsa280-4.7-2.patch Xen 4.7.x $ sha256sum xsa280* ff0b376b9e2ec16f7c15b144d4d38375d6f6b4019aa9c17f6b80f9dfe40319ef xsa280.meta 41b2b91dbabbf2048c790c5934ab696ef53932ff98d1069eb7c7ae52e61cd44b xsa280-1.patch d46e46a6e706e0d3416d40ed12227223f7e8f825dfc63ed203c1df115976e8a1 xsa280-2.patch 163eaf2e16d5cc314a81fa1254eb2809674001b2329c41556a078b7f94e72ced xsa280-4.7-2.patch 22e9d29f316356341db40c743ca59f9bb9d783a58fb6429d5badf57a77b5f34a xsa280-4.9-1.patch ff0a839dbd9347ec88aaeb7ef1145d0cd9029a19c6a478088c63c0959ba0e740 xsa280-4.10-2.patch 87940f3b84d0adfd89e1b2bc1a872ae2948e1621e4994e7879b77e327b0136b5 xsa280-4.11-2.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) EXCEPT the linear page table disabling one is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. However deployment of the linear page table disabling mitigation is NOT PERMITTED (except where all the affected systems and VMs are administered and used only by organisations which are members of the Xen Project Security Issues Predisclosure List). Specifically, deployment on public cloud systems is NOT permitted. This is because altering the set of features usable in a guest in connection with a security issue would be a user-visible change which could lead to the rediscovery of the vulnerability. Also: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. 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with SMTP id c16so7821503lfj.8 for ; Thu, 22 Nov 2018 20:43:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pathpartnertech.com; s=google; h=mime-version:from:date:message-id:subject:to; bh=e7eUEpf7rS59ELQGDMr3jTuAEPcxAjH0bFGmAUL8hXc=; b=kLeHliCTxnC6Sdzy45SnxDAuNAxcTXGdSRQylbGhAdPqBZufz1FEyCkdT59ej/ozJL Y8M/7tcyamGcb5GHyGYPRSROIsIRCbqwSHmZj92CHVZAbq28RfHLDFZ/FO74r7DtYWBB ZWKDb/BVoJbMIfkOe0iRRwtTLvkc9sa9STIreAGhm0tmgV35XTpUixtjw7Y/KoQ3iecf 0mpq+3XZ9ni29Y3AO1XtzpA7t7CUySSaRJYLt0q9ssEjq6zUHvFQPQtJx3LQjy+yEugR qE+9qou39y/QizzP4B4O+cObzEbuji+RuW9u69cFj2xtk6RuYIrH7Bedn58qtzpxhpAB RLzQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=e7eUEpf7rS59ELQGDMr3jTuAEPcxAjH0bFGmAUL8hXc=; b=Efu7fIRk+r6HQy67+Uypne4ou4Ll4q1NXsRA5uwCJxImK9C6ef+BQzMjz1xFPKU6ur rOtVBWMrnoMJea4TT7rh2TjVUu111gALHaKr5ft8ONqg+NluR3B04KoZIEIfOrc/dsPo 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List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============6462027037243373609==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" --===============6462027037243373609== Content-Type: multipart/alternative; boundary="00000000000087ec81057b4da173" --00000000000087ec81057b4da173 Content-Type: text/plain; charset="UTF-8" Hello, In case of Ethernet a bridge interface is created between Dom0 and DomU, so that DomU has the internet access bridge interface. We have only wireless chip in our board and how to create interface in case of wireless? Bridging doesn't work in case of wireless network. If we want use NAT, then through interface DomU will have access to internet? -- This message contains confidential information and is intended only for the individual(s) named. If you are not the intended recipient, you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this mail and attached file/s is strictly prohibited. Please notify the sender immediately and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secured or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission. --00000000000087ec81057b4da173 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello,

In case of Ethernet a= bridge interface is created between Dom0 and DomU, so that DomU has the in= ternet access bridge interface. We have only wireless chip in our board and= how to create interface in case of wireless?=C2=A0 Bridging doesn't wo= rk in case of wireless network. If we want use NAT, then through interface = DomU will have access to internet?


This message contains confidential information and is intended only for the individual(s) named. If you are not the = intended recipient, you are notified that disclosing, copying, distributing or takin= g any action in reliance on the contents of this mail and attached file/s is stri= ctly prohibited. Please notify the sender immediately and delete this e-mail from your system. E-mail transmis= sion cannot be guaranteed to be secured or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or cont= ain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mai= l transmission.

--00000000000087ec81057b4da173-- --===============6462027037243373609== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLXVzZXJz IG1haWxpbmcgbGlzdApYZW4tdXNlcnNAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0 cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi11c2Vycw== --===============6462027037243373609==-- From xen-users-bounces@lists.xenproject.org Thu Nov 29 11:42:33 2018 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Thu, 29 Nov 2018 11:42:33 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gSKhD-0000ng-PN; Thu, 29 Nov 2018 11:41:27 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1gSKhC-0000nQ-AQ for xen-users@lists.xenproject.org; Thu, 29 Nov 2018 11:41:26 +0000 X-Inumbo-ID: b2523c74-f3cb-11e8-aed6-12d6303a7972 Received: from apollo.dupie.be (unknown [62.210.113.39]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id b2523c74-f3cb-11e8-aed6-12d6303a7972; Thu, 29 Nov 2018 11:41:23 +0000 (UTC) Received: from [IPv6:2a02:1807:1420:400:c087:7621:2f07:e103] (unknown [IPv6:2a02:1807:1420:400:c087:7621:2f07:e103]) by apollo.dupie.be (Postfix) with ESMTPSA id 0797533C0315; Thu, 29 Nov 2018 12:40:51 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dupond.be; s=dkim; t=1543491652; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3BZ/cKnjk9fdtRphM5mTf5HVVlFbzZQddyqSmBfhG34=; b=a9xhezdzbJC1HLqJ5gwJSBfUX2ss5iVvh1BOepWUmasXqDaBtA2CD1LA6Qv/blpEeRGdFK puxlmsKPKcV9819UFAFfR6wK054SZeQSq75luIH6Z7jyBS5FX6sGeRgycajrS+3X9Dg1kG ioOkOTrsorxJpi4Nb7BBWOdRgHCUfeOxXJbNj3nibYKWqfoJC19/bjXBZzkspsmRckMoVG 2zZhcxzmu8EZpAsOPAJfcBlavbrUna7qoWHCnIsSgJFKOnF62pa3DieMhOSdu2ahP8uEeK XMU8O64zIVyzZJO2ATf7CEtWNTWUU9VJ7wPg/S6OySKQzLGvcs1XXzemx/hJIA== From: Jean-Louis Dupond To: Matthieu Cerda , xen-users@lists.xenproject.org References: <0a803f4a-2852-cde9-eb5d-473b2dd5ef60@dupond.be> <173a61217097d75e82009c24bc53236697481106.camel@suse.com> <1a5e1fff-cd21-1e2f-509c-7a3b07f70a0d@nbs-system.com> <3288b475-c763-78f7-d644-0d647599636a@dupond.be> Message-ID: <7bb4eb6a-f5fa-f416-4d2e-ce12c640e340@dupond.be> Date: Thu, 29 Nov 2018 12:40:51 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <3288b475-c763-78f7-d644-0d647599636a@dupond.be> Content-Language: en-US ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=dupond.be; s=dkim; t=1543491652; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3BZ/cKnjk9fdtRphM5mTf5HVVlFbzZQddyqSmBfhG34=; b=kGENmOMgvuIfoDPETUBIv/IWKBY/Ej5m54AwihVznY0xw0xAtbBem5irZI1sFtq6xF43cg RuVfo/ksQjxmwHK6OKqW0cr1+GWwd+qkwq/2JINzpq//vBpkeisb5NzjtGrApLBWvAzUNi dRsdk6ojkaPLFqLAu3HO3oi5pM+JlvSabrpniKeQBLRYJxRJGJI/Xz4JphRaEUtbkJm/AE KBCL9DoshRdy9nq/d7oya/EmhHntD0z0rTrDTs0nz/iryVyu1aW+a3pkNRA2oRm2oK4tAf XgZI/ubx9KpsiSph42GG8W2Xe7EZWxJn3qGJJfwyYrj7n6pP58gDKN6OFLNEhQ== ARC-Seal: i=1; s=dkim; d=dupond.be; t=1543491652; a=rsa-sha256; cv=none; b=UgVHvzKflhsiUS/yd9vor4Xm25BCvuhJ7VXjSNfU9mhhlterqObg4Yon3ZwV9PWrgdYc9c yuQ59wx0eOPoBODSG/hxRlR+JeuSJdsJik/N7BrA7R71Dr7+LbBenTvjmXf77YydA/yi+G pomFKtZsApNDLK3q7r/86rv0/1Kmo6YD361upuCT8pdZQ2Z4V5YhqCuk6N/P5LE+d9oadR PTjlepyZLhb+ATFuV9b3Fsfs6P+ylTWLtG0vWJEBq4jEPeKfY6csIaKWjIZrZfZGSUQt9L 4fzbY/oKPCEuAy1PtCKVOzB5FMslpupW+LLh1vtX0eaNC+M10igoNVUUlKhubw== ARC-Authentication-Results: i=1; ORIGINATING; auth=pass smtp.auth=jean-louis@dupond.be smtp.mailfrom=jean-louis@dupond.be Subject: Re: [Xen-users] Bad iSCSI I/O performance on Xen 4.6 X-BeenThere: xen-users@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen user discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============3942807529725651052==" Errors-To: xen-users-bounces@lists.xenproject.org Sender: "Xen-users" This is a multi-part message in MIME format. --===============3942807529725651052== Content-Type: multipart/alternative; boundary="------------C211DEE70BE7BEB4DC28D4ED" Content-Language: en-US This is a multi-part message in MIME format. --------------C211DEE70BE7BEB4DC28D4ED Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Finally we found the root cause(s) of this :) Testing on more recent kernels (4.18+) was broken due to SACK Compression patch that give issues in our cases. This was fixed in https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=86de5921a3d5dd246df661e09bdd0a6131b39ae3 Now this showed us that results were almost the same for all ranges of kernels. Some more troubleshooting showed tcp window scaling seems to be incorrect. Finally (many thanks to Eric), we found the root cause! This is fixed with the following patch: https://www.mail-archive.com/netdev@vger.kernel.org/msg256497.html We went from from 16.5 MB/s to 391 MB/s read speed inside a domU !! Seems like case closed :) On 17/10/18 17:51, Jean-Louis Dupond wrote: > > Even did some more tests today :) > > Xen 4.8 and 4.10 have the same results. No change there unfortunately :( > > But when playing around with dom0 CPU's and pinning, got the following > results: > dom0 -> 2cpu - no pinning => 73.5 MB/s > dom0 -> 2cpu + pinning => 519 MB/s > dom0 -> 8cpu + pinning => 124 MB/s > > This was with 4.9.127-32.el6.x86_64 and Xen 4.10.2-1.el6. > > Perfomance inside the VM is still really bad: 18.4 MB/s :( > > Thanks > Jean-Louis > > On 16/10/18 17:28, Jean-Louis Dupond wrote: >> >> Hi Matthieu, >> >> I did all tests on dom0, and the bug listed there seems only to >> affect domU. >> So I doubt this will be related. >> >> Thanks >> Jean-Louis >> >> On 16/10/18 17:11, Matthieu Cerda wrote: >>> Hello, >>> >>> You might be hitting the issue that has been discussed here: >>> https://lists.xenproject.org/archives/html/xen-users/2017-07/msg00023.html >>> >>> We solved the issue by upgrading to the latest backport kernel (4.14 >>> at the time), it seemed due to a loop device regression in Linux. >>> >>> Maybe you should try with a more recent kernel ? >>> >>> Cheers, >>> -- >>> Matthieu CERDA >>> >>> Le 16/10/2018 à 16:53, Jean-Louis Dupond a écrit : >>>> >>>> Did even more testing today, and seems like we hit 2 problems. >>>> >>>> On a plain 4.9.13 kernel, without Xen, I get 686 MB/s. >>>> With Xen (on dom0) => 58.8 MB/s >>>> >>>> But after upgrade to 4.9.127 >>>> without Xen => 161 MB/s >>>> with Xen => 40.3 MB/s >>>> >>>> Then I tried downgrading to Xen xen-4.6.6-8.el6.x86_64 >>>> And that gives the following. >>>> >>>> With 4.9.13 kernel: 107 MB/s >>>> With 4.9.127 kernel: 61.9 MB/s >>>> >>>> It might be retpoline/spectre/meltdown changes? >>>> Tried adding 'spectre_v2=off nopti' to the boot line on 4.9.127 >>>> kernel (without Xen), and then it speed is 171 MB/s (10 MB/s faster) >>>> >>>> Seems like this will be a hard one to debug further :( >>>> >>>> Any other idea's are welcome :) >>>> >>>> Thanks >>>> Jean-Louis >>>> >>>> On 11/10/18 17:15, Jean-Louis Dupond wrote: >>>>> >>>>> FYI, >>>>> >>>>> After some additional debugging, I found out that on the machine >>>>> the speed is perfect when running stock CentOS 6 kernel (2.6.32). >>>>> When using a 4.9.x of 4.18.x kernel, the speed is degraded again. >>>>> >>>>> Speed on 2.6.32: 320 MB/s >>>>> Speed on 4.9.x : 55.2 MB/s >>>>> >>>>> But when I disable gro on the storage NIC, It boosts to 157 MB/s. >>>>> That is already better, but still way below what we have on 2.6.32 ... >>>>> >>>>> I also did tests on plain machine without Xen, and with the same >>>>> results. >>>>> So it doesn't looks like its Xen related, but more iSCSi/Kernel. >>>>> >>>>> Thanks >>>>> Jean-Louis >>>>> >>>>> >>>>> On 11-10-18 11:18, Dario Faggioli wrote: >>>>>> [Adding Roger] >>>>>> >>>>>> On Mon, 2018-10-08 at 13:10 +0200, Jean-Louis Dupond wrote: >>>>>>> Hi, >>>>>>> >>>>>>> We are hitting some I/O limitation on some of our Xen hypervisors. >>>>>>> The hypervisors are running CentOS 6 with Xen 4.6.6-12.el6 and >>>>>>> 4.9.105+ >>>>>>> kernels. >>>>>>> >>>>>>> The hypervisors are attached with 10G network to the SAN network. >>>>>>> And >>>>>>> there is no congestion at all. >>>>>>> Storage is exported via iSCSI and we use multipathd for failover. >>>>>>> Now we see a performance of +-200MB/sec write speed, but only a poor >>>>>>> 20-30mb/sec read speed on a LUN on the SAN. >>>>>>> This is while testing this on dom0. Same speeds on domU. >>>>>>> >>>>>>> If I do the same test on a Xen 4.4.4-34.el6 hypervisor to the same >>>>>>> LUN >>>>>>> (but attached with 1G), I max out the link (100MB read/write). >>>>>>> >>>>>> Right. But, if I've understood correctly, you're changing two things (I >>>>>> mean between the two tests), i.e., the hypervisor and the NIC. >>>>>> (BTW, is dom0 kernel the same, or does that also change?). >>>>>> >>>>>> This makes it harder to narrow things down to where the problem could >>>>>> be. >>>>>> >>>>>> What would be useful to see would be the results of running: >>>>>> - Xen 4.4.4-34.el6, with 4.9.105+ dom0 kernel on the 10G NIC / host, >>>>>> and compare this with Xen 4.6.6-12.el6, with the same kernel on the >>>>>> same NIC / host; >>>>>> - Xen 4.6.6-12.el6, with 4.9.105+ dom0 kernel on the 1G NIC / host, >>>>>> and compare this with Xen 4.4.4-34.el6, with the same kernel on the >>>>>> same NIC / host. >>>>>> >>>>>> This will tell us, if there is a regression between Xen 4.4.x and Xen >>>>>> 4.6.x (as that is _the_only_ thing that varies). >>>>>> >>>>>> And this is assuming the versions of the dom0 kernels, and of all the >>>>>> other components involved are the same. If they're not, we need to go >>>>>> checking, changing one component at a time. >>>>>> >>>>>>> So it really looks like the Xen 4.6 hypervisors are reaching some >>>>>>> bottleneck. But we couldn't locate it yet :) >>>>>>> >>>>>> There seems to be issues, but from the tests you've performed so far, I >>>>>> don't think we can conclude the problem is in Xen. And we need to know >>>>>> at least where the problem most likely is, in order to have any chance >>>>>> to find it! :-) >>>>>> >>>>>>> The hypervisor's dom0 has 8 vCPU and 8GB RAM, which should be plenty! >>>>>>> >>>>>> Probably. But, just in case, have you tried increasing, e.g., the >>>>>> number of dom0's vcpus? Is things like vcpu-pinning or similar features >>>>>> being used? Is the host a NUMA box? (Or, more generally, what are the >>>>>> characteristics of the host[s]?) >>>>>> >>>>>> Regards, >>>>>> Dario >>> >>> _______________________________________________ >>> Xen-users mailing list >>> Xen-users@lists.xenproject.org >>> https://lists.xenproject.org/mailman/listinfo/xen-users > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xenproject.org > https://lists.xenproject.org/mailman/listinfo/xen-users --------------C211DEE70BE7BEB4DC28D4ED Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

Finally we found the root cause(s) of this :)

Testing on more recent kernels (4.18+) was broken due to SACK Compression patch that give issues in our cases.
This was fixed in https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=86de5921a3d5dd246df661e09bdd0a6131b39ae3

Now this showed us that results were almost the same for all ranges of kernels.
Some more troubleshooting showed tcp window scaling seems to be incorrect.

Finally (many thanks to Eric), we found the root cause!

This is fixed with the following patch:
https://www.mail-archive.com/netdev@vger.kernel.org/msg256497.html

We went from from 16.5 MB/s to 391 MB/s read speed inside a domU !!

Seems like case closed :)

On 17/10/18 17:51, Jean-Louis Dupond wrote:

Even did some more tests today :)

Xen 4.8 and 4.10 have the same results. No change there unfortunately :(

But when playing around with dom0 CPU's and pinning, got the following results:
dom0 -> 2cpu - no pinning => 73.5 MB/s
dom0 -> 2cpu + pinning => 519 MB/s
dom0 -> 8cpu + pinning => 124 MB/s

This was with 4.9.127-32.el6.x86_64 and Xen 4.10.2-1.el6.

Perfomance inside the VM is still really bad: 18.4 MB/s :(

Thanks
Jean-Louis

On 16/10/18 17:28, Jean-Louis Dupond wrote:

Hi Matthieu,

I did all tests on dom0, and the bug listed there seems only to affect domU.
So I doubt this will be related.

Thanks
Jean-Louis

On 16/10/18 17:11, Matthieu Cerda wrote:
Hello,

You might be hitting the issue that has been discussed here: https://lists.xenproject.org/archives/html/xen-users/2017-07/msg00023.html

We solved the issue by upgrading to the latest backport kernel (4.14 at the time), it seemed due to a loop device regression in Linux.

Maybe you should try with a more recent kernel ?

Cheers,
--
Matthieu CERDA

Le 16/10/2018 à 16:53, Jean-Louis Dupond a écrit :

Did even more testing today, and seems like we hit 2 problems.

On a plain 4.9.13 kernel, without Xen, I get 686 MB/s.
With Xen (on dom0) => 58.8 MB/s

But after upgrade to 4.9.127
without Xen => 161 MB/s
with Xen => 40.3 MB/s

Then I tried downgrading to Xen xen-4.6.6-8.el6.x86_64
And that gives the following.

With 4.9.13 kernel: 107 MB/s
With 4.9.127 kernel: 61.9 MB/s

It might be retpoline/spectre/meltdown changes?
Tried adding 'spectre_v2=off nopti' to the boot line on 4.9.127 kernel (without Xen), and then it speed is 171 MB/s (10 MB/s faster)

Seems like this will be a hard one to debug further :(

Any other idea's are welcome :)

Thanks
Jean-Louis

On 11/10/18 17:15, Jean-Louis Dupond wrote:

FYI,

After some additional debugging, I found out that on the machine the speed is perfect when running stock CentOS 6 kernel (2.6.32).
When using a 4.9.x of 4.18.x kernel, the speed is degraded again.

Speed on 2.6.32: 320 MB/s
Speed on 4.9.x : 55.2 MB/s

But when I disable gro on the storage NIC, It boosts to 157 MB/s.
That is already better, but still way below what we have on 2.6.32 ...

I also did tests on plain machine without Xen, and with the same results.
So it doesn't looks like its Xen related, but more iSCSi/Kernel.

Thanks
Jean-Louis


On 11-10-18 11:18, Dario Faggioli wrote:
[Adding Roger]

On Mon, 2018-10-08 at 13:10 +0200, Jean-Louis Dupond wrote:

Hi,

We are hitting some I/O limitation on some of our Xen hypervisors.
The hypervisors are running CentOS 6 with Xen 4.6.6-12.el6 and
4.9.105+ 
kernels.

The hypervisors are attached with 10G network to the SAN network.
And 
there is no congestion at all.
Storage is exported via iSCSI and we use multipathd for failover.
Now we see a performance of +-200MB/sec write speed, but only a poor 
20-30mb/sec read speed on a LUN on the SAN.
This is while testing this on dom0. Same speeds on domU.

If I do the same test on a Xen 4.4.4-34.el6 hypervisor to the same
LUN 
(but attached with 1G), I max out the link (100MB read/write).


Right. But, if I've understood correctly, you're changing two things (I
mean between the two tests), i.e., the hypervisor and the NIC.
(BTW, is dom0 kernel the same, or does that also change?).

This makes it harder to narrow things down to where the problem could
be.

What would be useful to see would be the results of running:
- Xen 4.4.4-34.el6, with 4.9.105+ dom0 kernel on the 10G NIC / host,
  and compare this with Xen 4.6.6-12.el6, with the same kernel on the 
  same NIC / host;
- Xen 4.6.6-12.el6, with 4.9.105+ dom0 kernel on the 1G NIC / host,
  and compare this with Xen 4.4.4-34.el6, with the same kernel on the
  same NIC / host.

This will tell us, if there is a regression between Xen 4.4.x and Xen
4.6.x (as that is _the_only_ thing that varies).

And this is assuming the versions of the dom0 kernels, and of all the
other components involved are the same. If they're not, we need to go
checking, changing one component at a time.


So it really looks like the Xen 4.6 hypervisors are reaching some 
bottleneck. But we couldn't locate it yet :)


There seems to be issues, but from the tests you've performed so far, I
don't think we can conclude the problem is in Xen. And we need to know
at least where the problem most likely is, in order to have any chance
to find it! :-)


The hypervisor's dom0 has 8 vCPU and 8GB RAM, which should be plenty!


Probably. But, just in case, have you tried increasing, e.g., the
number of dom0's vcpus? Is things like vcpu-pinning or similar features
being used? Is the host a NUMA box? (Or, more generally, what are the
characteristics of the host[s]?)

Regards,
Dario


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