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Re: [Xen-devel] [BUG] hhvm running on Ubuntu 13.04 with Xen Hypervisor - linux kernel panic

To: Craig Carnell <ccarnell@xxxxxxxxxx>
From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Date: Mon, 30 Sep 2013 17:35:25 -0400
Cc: "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>
Delivery-date: Mon, 30 Sep 2013 21:33:37 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 09/30/2013 07:02 AM, Craig Carnell wrote:

Not sure what you mean by post leaf for an AMD processor, what is the
command? (sorry just a dumb PHP developer here!)


Actually, since this is an AMD processor CPUID won't help here.


Here the output you requested from dmesg:

dmesg | grep -i perf

[    0.004000] Initializing cgroup subsys perf_event
[    0.064156] Performance Events:


I'd expect something like
root@orochi-c> dmesg |grep -i perf
[    0.006473] Initializing cgroup subsys perf_event

[ 0.053000] Performance Events: Fam15h core perfctr, Broken PMUhardware detected, using software events only.

[    0.054010] Failed to access perfctr msr (MSR c0010201 is 0)
root@orochi-c>

BTW, I was able to build and run hhvm on a PV guest (and I assume youare running a PV guest):


    root@orochi-c> ./hphp/hhvm/hhvm -m s
    mapping self...
    mapping self took 0'00" (42810 us) wall time
    loading static content...
    searching all files under source root...
    analyzing 31428 files under source root...
    loaded 0 bytes of static content in total
    loading static content took 0'00" (117386 us) wall time
    page server started
    all servers started

I don't know Rackspace UI so maybe you can't do this but it would beuseful to see Xen configuration file for your guest. And Xen version,boot options and such (output of 'xm info', for example)


-boris


Sorry if it's not more helpful!

Craig.



On 22/09/2013 01:08, "Boris Ostrovsky" <boris.ostrovsky@xxxxxxxxxx> wrote:

----- konrad.wilk@xxxxxxxxxx wrote:

On Wed, Sep 18, 2013 at 11:21:18AM +0000, Craig Carnell wrote:

Hi,

I am trying out hiphop vm (the php just in time compiler). My setup

is a Rackspace Cloud Server running Ubuntu 13.04 with kernel
3.8.0-30-generic #44-Ubuntu SMP Thu Aug 22 20:52:24 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux

The cloud server uses Xen Hypervisor.

Hiphopvm is compiled from source using the github repo. When running

hhvm from the command line (without any options or php application)
the system immediately crashes, throwing linux into a kernel panic and
thus death.
And what happens if you run 'perf' by itself?

I have reported this issue on hiphop github issue page:

https://github.com/facebook/hiphop-php/issues/1065

I am not sure if this is a linux kernel bug or a xen hypervisor

bug:

The output of /var/log/syslog:

Sep 18 10:55:58 web kernel: [92118.674736] general protection fault:

0000 [#1] SMP

Sep 18 10:55:58 web kernel: [92118.674754] Modules linked in:

xenfs(F) xen_privcmd(F) xt_tcpudp(F) nf_conntrack_ipv4(F)
nf_defrag_ipv4(F) xt_state(F) nf_conntrack(F) xt_comment(F)
iptable_filter(F) ip_tables(F) x_tables(F) microcode(F) lp(F)
parport(F)

Sep 18 10:55:58 web kernel: [92118.674781] CPU 0
Sep 18 10:55:58 web kernel: [92118.674787] Pid: 5020, comm: hhvm

Tainted: GF            3.8.0-30-generic #44-Ubuntu

Sep 18 10:55:58 web kernel: [92118.674795] RIP:

e030:[<ffffffff81003046>]  [<ffffffff81003046>]
native_read_pmc+0x6/0x20


The link above seems to imply that this is a PV guest. RDPMC instruction
is not currently emulated which would cause a #GP to the guest.

I suspect that hhvm may be assuming that performance counters exist and
this
is not always the case.

Can you post CPUID leaf 0xa if this is Intel processor and leaf 0x80000001
if this is AMD (from the guest)? And 'dmesg | grep -i perf'.

-boris

Sep 18 10:55:58 web kernel: [92118.674809] RSP:

e02b:ffff8800026b9d20  EFLAGS: 00010083

Sep 18 10:55:58 web kernel: [92118.674814] RAX: ffffffff81c1bd80

RBX: 0000000000000000 RCX: 0000000000000000

Sep 18 10:55:58 web kernel: [92118.674819] RDX: 0000000000005f6c

RSI: ffff8800f7c81900 RDI: 0000000000000000

Sep 18 10:55:58 web kernel: [92118.674824] RBP: ffff8800026b9d20

R08: 00000000000337d8 R09: ffff8800e933dcc0

Sep 18 10:55:58 web kernel: [92118.674830] R10: 00007fff2d3caea0

R11: 0000000000000246 R12: ffff8800f87ecc00

Sep 18 10:55:58 web kernel: [92118.674835] R13: ffff800000000001

R14: ffff8800f87ecd70 R15: 0000000000000010

Sep 18 10:55:58 web kernel: [92118.674844] FS:

00007f43d4c9b180(0000) GS:ffff8800ffc00000(0000)
knlGS:0000000000000000

Sep 18 10:55:58 web kernel: [92118.674850] CS:  e033 DS: 0000 ES:

0000 CR0: 000000008005003b

Sep 18 10:55:58 web kernel: [92118.674855] CR2: 000000000105ebc0

CR3: 00000000025cd000 CR4: 0000000000000660

Sep 18 10:55:58 web kernel: [92118.674861] DR0: 0000000000000000

DR1: 0000000000000000 DR2: 0000000000000000

Sep 18 10:55:58 web kernel: [92118.674867] DR3: 0000000000000000

DR6: 00000000ffff0ff0 DR7: 0000000000000400

Sep 18 10:55:58 web kernel: [92118.674872] Process hhvm (pid: 5020,

threadinfo ffff8800026b8000, task ffff8800f7cfc5c0)

Sep 18 10:55:58 web kernel: [92118.674879] Stack:
Sep 18 10:55:58 web kernel: [92118.674882]  ffff8800026b9d58

ffffffff81024625 0000000000000000 ffff8800f87ecc00

Sep 18 10:55:58 web kernel: [92118.674893]  ffff8800f7c8190c

ffffffff811231a0 0000000000000005 ffff8800026b9d68

Sep 18 10:55:58 web kernel: [92118.674902]  ffffffff81024689

ffff8800026b9d90 ffffffff811232a6 00000000ffff02ff

Sep 18 10:55:58 web kernel: [92118.674911] Call Trace:
Sep 18 10:55:58 web kernel: [92118.674920]  [<ffffffff81024625>]

x86_perf_event_update+0x55/0xb0

Sep 18 10:55:58 web kernel: [92118.674929]  [<ffffffff811231a0>] ?

perf_read+0x2f0/0x2f0

Sep 18 10:55:58 web kernel: [92118.674936]  [<ffffffff81024689>]

x86_pmu_read+0x9/0x10

Sep 18 10:55:58 web kernel: [92118.674942]  [<ffffffff811232a6>]

__perf_event_read+0x106/0x110

Sep 18 10:55:58 web kernel: [92118.674951]  [<ffffffff810b9987>]

smp_call_function_single+0x147/0x170

Sep 18 10:55:58 web kernel: [92118.674959]  [<ffffffff811240d0>] ?

perf_mmap+0x2f0/0x2f0

Sep 18 10:55:58 web kernel: [92118.674966]  [<ffffffff81122dda>]

perf_event_read+0x10a/0x110

Sep 18 10:55:58 web kernel: [92118.674972]  [<ffffffff811240d0>] ?

perf_mmap+0x2f0/0x2f0

Sep 18 10:55:58 web kernel: [92118.674979]  [<ffffffff811240dd>]

perf_event_reset+0xd/0x20

Sep 18 10:55:58 web kernel: [92118.674987]  [<ffffffff8111ff08>]

perf_event_for_each_child+0x38/0xa0

Sep 18 10:55:58 web kernel: [92118.674994]  [<ffffffff811240d0>] ?

perf_mmap+0x2f0/0x2f0

Sep 18 10:55:58 web kernel: [92118.675001]  [<ffffffff8112255a>]

perf_ioctl+0xba/0x340

Sep 18 10:55:58 web kernel: [92118.675009]  [<ffffffff811b1885>] ?

fd_install+0x25/0x30

Sep 18 10:55:58 web kernel: [92118.675016]  [<ffffffff811a60e9>]

do_vfs_ioctl+0x99/0x570

Sep 18 10:55:58 web kernel: [92118.675023]  [<ffffffff811a6651>]

sys_ioctl+0x91/0xb0

Sep 18 10:55:58 web kernel: [92118.675031]  [<ffffffff816d575d>]

system_call_fastpath+0x1a/0x1f

Sep 18 10:55:58 web kernel: [92118.675036] Code: 00 00 00 00 00 55

89 f9 48 89 e5 0f 32 31 ff 89 c0 48 c1 e2 20 89 3e 48 09 c2 48 89 d0
5d c3 66 0f 1f 44 00 00 55 89 f9 48 89 e5 <0f> 33 89 c0 48 c1 e2 20 48
09 c2 48 89 d0 5d c3 66 2e 0f 1f 84

Sep 18 10:55:58 web kernel: [92118.675103] RIP  [<ffffffff81003046>]

native_read_pmc+0x6/0x20

Sep 18 10:55:58 web kernel: [92118.675110]  RSP <ffff8800026b9d20>
Sep 18 10:55:58 web kernel: [92118.675118] ---[ end trace

1a73231ba5f74716 ]---

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References:
- Re: [Xen-devel] [BUG] hhvm running on Ubuntu 13.04 with Xen Hypervisor - linux kernel panic
  - From: Craig Carnell

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