linux-kernel - Re: KVM segfaults with 3.5 while installing ubuntu 12.04

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Message-ID: <5018F5BB.9070500@profihost.ag>
Date:	Wed, 01 Aug 2012 11:24:11 +0200
From:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
To:	Avi Kivity <avi@...hat.com>
CC:	mtosatti@...hat.com, kvm@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: KVM segfaults with 3.5 while installing ubuntu 12.04

Hi,

ok i found a faster way to trigger this. Just boot the ubuntu rescue system.

So here are 3 backtraces from booting the rescue system:
http://pastebin.com/raw.php?i=xCy2pEcP

To me they all look the same.

Thanks!

Stefan

Am 01.08.2012 10:44, schrieb Avi Kivity:
> On 07/31/2012 08:37 PM, Stefan Priebe wrote:
>> Now i got it working - sorry used old gdb.
>>
>> This is the backtrace:
>>
>> Core was generated by `/usr/bin/qemu-system-x86_64 -id 103 -chardev
>> socket,id=qmp,path=/var/run/qemu-s'.
>> Program terminated with signal 11, Segmentation fault.
>> #0  0x00007f6ca10faed8 in ?? () from /lib/libc.so.6
>> (gdb) where
>> #0  0x00007f6ca10faed8 in ?? () from /lib/libc.so.6
>> #1  0x00007f6ca54e0098 in virtio_notify_vector (vdev=0x7f6ca10fae98,
>> vector=32620)
>>      at /root/src/pve-qemu-kvm/qemu-kvm/hw/virtio.c:493
>> #2  0x00007f6ca54e0e25 in virtio_notify (vdev=0x7f6ca10fae98,
>> vq=0x7f6ca10faf18) at /root/src/pve-qemu-kvm/qemu-kvm/hw/virtio.c:739
>> #3  0x00007f6ca54d5bb0 in virtio_blk_req_complete (req=0x7f6ca6fe4440,
>> status=0)
>
> I notice the ip is different from the first trace. Please run this a few
> more times and see if it always fails in the same place, or in random
> places (and post the traces please).
>
>
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