From: Avi Kivity <avi@redhat.com>
To: Nikola Ciprich <extmaillist@linuxbox.cz>
Cc: KVM list <kvm@vger.kernel.org>, nikola.ciprich@linuxbox.cz
Subject: Re: both qemu-kvm-0.10.6 and kvm-88 crashing under heavy load while using scsi-backed storage
Date: Wed, 02 Sep 2009 22:21:10 +0300 [thread overview]
Message-ID: <4A9EC5A6.1040307@redhat.com> (raw)
In-Reply-To: <20090902172342.GA6090@nik-comp.linuxbox.cz>
On 09/02/2009 08:23 PM, Nikola Ciprich wrote:
> Hello,
> we're having problem one of our kvm guests. According to storage summary mail Christopher
> sent few days ago, I switched my disk model to SCSI which should be the safest choice.
> But now we've stumbled upon the problem that the whole guest crashes when we run one
> specific postgres query which heavily loads it.
>
scsi is hardly tested, so this isn't surprising.
> I can 100% reproduce this problem on both our production nodes (each 8cores, 16GB RAM),
> on my testing machine (4cores, 3GB RAM) this causes the HOST to reboot (which is even worse).
> We haven't experienced this problem with virtio.
>
AMD or Intel? Uni or smp guests?
The host crash is of course more worrying. Can you capture dmesg?
> I tried both qemu-kvm-0.10.6 and kvm-88, the host is running 2.6.30.5, I tried 2.6.29.x and
> 2.6.30.5 for guest.
>
> Guest backtrace follows (it's a bit mangled as it's obtained using netconsole)
> Sep 2 19:01:20 sql2 [ 1564.795629] BUG: unable to handle kernel
> Sep 2 19:01:20 sql2 NULL pointer dereference
> Sep 2 19:01:20 sql2 NULL pointer dereference
> Sep 2 19:01:20 sql2 at 0000000000000358
> Sep 2 19:01:20 sql2 [ 1564.797727] IP:
> Sep 2 19:01:20 sql2 at 0000000000000358
> Sep 2 19:01:20 sql2 [ 1564.797727] IP:
> Sep 2 19:01:20 sql2 [<ffffffffa018beff>] sym_int_sir+0x2bf/0x1590 [sym53c8xx]
> Sep 2 19:01:20 sql2 [<ffffffffa018beff>] sym_int_sir+0x2bf/0x1590 [sym53c8xx]
>
It's in the scsi driver, so it's probable our scsi emulation is broken.
Or maybe (unlikely) a bug in the driver.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2009-09-02 19:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-02 17:23 both qemu-kvm-0.10.6 and kvm-88 crashing under heavy load while using scsi-backed storage Nikola Ciprich
2009-09-02 19:21 ` Avi Kivity [this message]
2009-09-02 21:14 ` Nikola Ciprich
2009-09-02 21:42 ` Avi Kivity
2009-09-03 9:59 ` Nikola Ciprich
2009-09-03 10:05 ` Avi Kivity
2009-09-03 10:18 ` Nikola Ciprich
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