Re: [Xen-users] OpenSuSE 11.2 bug, dom0-cpus limit causes xenwatch_cb running 100% and xm command freeze and xend dead

[Vladislav Karpenko <vladislav@xxxxxxxxxxxxxx>]

Yes have that also, y could try to fix it if u say in boot kernel option vcpu 
amount
mine is:
dom0_mem=512M dom0_vcpus_pin dom0_max_vcpus=1

but for now i dont use suse 12.2, its not stable with xen 3.4.1


23 ÃÄÅÃ. 2009, Ã 15:26, Fischer Udo Attila ÃÃÄÃÃÃÄ(Ã):

> Hi all,
> 
> I have upgraded a test machine from OpenSuSE 11.1 to 11.2.
> I have found following bug:
> the server is a 2x quadcore intel box also 2x4=8cpu
> 
> If you limit the dom0 cpu with dom0-cpus= [1-7]:
> - [xenwatch_cb] is running 100% cpu and makes var log entry every 65 sec
> BUG: soft lockup - CPU#X stuck for 61s!
> - xm commands not work
> - xend is dead
> 
> 
> 
> if set dom0-cpus to 0 or 8:
> - everything looks fine
> 
> Can somebody else confirm that bug?
> 
> 
> Best regards
> 
> Udo Attila Fischer
> ------------------------------
> 
> 
> 
> for example: vcpu=7
> 
> PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> 4532 root      15  -5     0    0    0 R  100  0.0  11:14.84 xenwatch_cb
> 
> 
> # ps aux |grep xen
> root        39  0.0  0.0      0     0 ?        S<   13:03   0:00 [xenwatch]
> root        40  0.0  0.0      0     0 ?        S<   13:03   0:00 [xenbus]
> root      3791  0.0  0.0  11300  1560 ?        S    13:04   0:00 /bin/bash
> /etc/init.d/xend start
> root      4209  0.0  0.1 107504 13864 ?        S    13:04   0:00
> /usr/bin/python2.6 /usr/sbin/xend start
> root      4446  0.0  0.0   8488  1000 ?        S    13:04   0:00 xenstored
> --pid-file /var/run/xenstore.pid
> root      4448  0.0  0.0      0     0 ?        Z    13:04   0:00
> [xenconsoled] <defunct>
> root      4450  0.0  0.0      0     0 ?        Zs   13:04   0:00 [xend]
> <defunct>
> root      4451  0.0  0.1 107500 11500 ?        S    13:04   0:00
> /usr/bin/python2.6 /usr/sbin/xend start
> root      4453  0.0  0.0  22724   560 ?        Sl   13:04   0:00 xenconsoled
> root      4455  0.0  0.2 148304 16652 ?        Sl   13:04   0:00
> /usr/bin/python2.6 /usr/sbin/xend start
> root      4532  100  0.0      0     0 ?        R<   13:04  40:35
> [xenwatch_cb]
> root      4533  0.0  0.0      0     0 ?        D<   13:04   0:00
> [xenwatch_cb]
> root      4534  0.0  0.0      0     0 ?        D<   13:04   0:00
> [xenwatch_cb]
> root      4535  0.0  0.0      0     0 ?        D<   13:04   0:00
> [xenwatch_cb]
> root      4536  0.0  0.0      0     0 ?        D<   13:04   0:00
> [xenwatch_cb]
> 
> 
> 
> from /var/log/messages every 65 sec
> 
> Nov 23 13:55:14 dom0-u2 kernel: [ 3112.781517] BUG: soft lockup - CPU#4
> stuck for 61s! [xenwatch_cb:4532]
> Nov 23 13:55:14 dom0-u2 kernel: [ 3112.781517] Modules linked in:
> sha1_generic hmac cryptomgr aead pcompress crypto_
> blkcipher crypto_hash crypto_algapi drbd netbk blkbk blkback_pagemap
> blktap xenbus_be binfmt_misc xt_tcpudp ip6t_REJ
> ECT nf_conntrack_ipv6 ip6table_raw xt_NOTRACK ipt_REJECT xt_physdev
> xt_state iptable_raw iptable_filter ip6table_man
> gle nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4
> ip_tables ip6table_filter ip6_tables x_tab
> les ipv6 bridge stp llc dummy fuse loop dm_mod mptctl iTCO_wdt
> iTCO_vendor_support i5k_amb sg i5000_edac ppdev 8250_
> pnp pcspkr sr_mod edac_core parport_pc shpchp e1000e dcdbas 8250
> pci_hotplug tg3 parport serio_raw serial_core butto
> n usbhid hid uhci_hcd ehci_hcd xenblk cdrom xennet edd fan ide_pci_generic
> piix ide_core ata_generic ata_piix mptsas
> mptscsih mptbase scsi_transport_sas thermal processor thermal_sys hwmon
> Nov 23 13:55:14 dom0-u2 kernel: [ 3112.781517] CPU 4:
> Nov 23 13:55:14 dom0-u2 kernel: [ 3112.781517] Modules linked in:
> sha1_generic hmac cryptomgr aead pcompress crypto_blkcipher crypto_hash
> crypto_algapi drbd netbk blkbk blkback_pagemap blktap xenbus_be
> binfmt_misc xt_tcpudp ip6t_REJECT nf_conntrack_ipv6 ip6table_raw
> xt_NOTRACK ipt_REJECT xt_physdev xt_state iptable_raw iptable_filter
> ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack
> nf_defrag_ipv4 ip_tables ip6table_filter ip6_tables x_tables ipv6 bridge
> stp llc dummy fuse loop dm_mod mptctl iTCO_wdt iTCO_vendor_support i5k_amb
> sg i5000_edac ppdev 8250_pnp pcspkr sr_mod edac_core parport_pc shpchp
> e1000e dcdbas 8250 pci_hotplug tg3 parport serio_raw serial_core button
> usbhid hid uhci_hcd ehci_hcd xenblk cdrom xennet edd fan ide_pci_generic
> piix ide_core ata_generic ata_piix mptsas mptscsih mptbase
> scsi_transport_sas thermal processor thermal_sys hwmon
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] RIP:
> e030:[<ffffffff8005f07f>]  [<ffffffff8005f07f>] lock_timer_base+
> 0x7f/0x90
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] RSP: e02b:ffff8801e8d0bc10 
> EFLAGS: 00000246
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] RAX: 0000000000000000 RBX:
> 0000000000000000 RCX: ffffffff80778370
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] RDX: 0000000000000007 RSI:
> ffff8801e8d0bc50 RDI: ffffc90000075280
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] RBP: ffff8801e8d0bc40 R08:
> ffffffff807813b0 R09: 0000000000000000
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] R10: ffff8801e8d0bcf0 R11:
> 00000000e15cfb6d R12: ffffc90000075280
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] R13: ffff8801e8d0bc50 R14:
> 0000000000000000 R15: ffffffff80778600
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] FS:  00007f53d0abf6f0(0000)
> GS:ffffc90000040000(0000) knlGS:0000000000000000
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] CS:  e033 DS: 0000 ES: 0000
> CR0: 000000008005003b
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] CR2: 00007f53d0691260 CR3:
> 0000000000003000 CR4: 0000000000002660
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] DR0: 0000000000000000 DR1:
> 0000000000000000 DR2: 0000000000000000
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] DR3: 0000000000000000 DR6:
> 00000000ffff0ff0 DR7: 0000000000000400
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855] Call Trace:
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff8005f0bc>]
> try_to_del_timer_sync+0x2c/0x90
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff8005f14a>]
> del_timer_sync+0x2a/0x50
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff8046758f>]
> mce_cpu_callback+0x122/0x1aa
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff80471de7>]
> notifier_call_chain+0x57/0xb0
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff80075a1c>]
> __raw_notifier_call_chain+0x1c/0x40
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff8045b90f>]
> _cpu_down+0xaf/0x310
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff8045bbf7>]
> cpu_down+0x87/0xb0
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff8046a42c>]
> vcpu_hotplug+0xce/0x102
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff8046a4ab>]
> handle_vcpu_hotplug_event+0x4b/0x61
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff80306c4c>]
> xenwatch_handle_callback+0x2c/0x80
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff8006fb96>]
> kthread+0xb6/0xc0
> Nov 23 13:54:09 dom0-u2 kernel: [ 3047.280855]  [<ffffffff8000d38a>]
> child_rip+0xa/0x20
> 
> 
> 
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