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Date: Thu, 23 May 2013 21:22:03 +0200
From: Stefan Priebe <s.priebe@profihost.ag>
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Subject: Re: [Qemu-devel] segfault in aio_bh_poll async.c:80 WAS: Re: kvm
 process disappears
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Josh Durgin <josh.durgin@inktank.com>, Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel <qemu-devel@nongnu.org>, "pve-devel@pve.proxmox.com" <pve-devel@pve.proxmox.com>, Michael Roth <mdroth@linux.vnet.ibm.com>

Am 23.05.2013 12:09, schrieb Paolo Bonzini:
> Il 22/05/2013 14:24, Stefan Priebe - Profihost AG ha scritto:
>> Am 22.05.2013 um 10:41 schrieb Paolo Bonzini <pbonzini@redhat.com>:
>>
>>> Il 22/05/2013 08:26, Stefan Priebe - Profihost AG ha scritto:
>>>>> Hi,
>>>>>
>>>>> as i can't reproduce no ;-( i just saw the kernel segfault message and
>>>>> used addr2line and a qemu dbg package to get the code line.
>>>>
>>>> I've now seen this again for two or three times. It always happens
>>>> when we do an fstrim inside the guest.
>>>
>>>
>>>> And I've seen this first since josh async rbd patch.
>>>
>>> This one?
>>>
>>> commit dc7588c1eb3008bda53dde1d6b890cd299758155
>>
>> Yes. But i'm not sure whether this is coincendence.
>
> Ok.
>
>>>   Do you see it even with "-drive discard=off"?
>>
>> I use discard / trim for thin provisioning and need it. This is a
>> production system so I can't test without it.
>>
>> I use scsi virtio with discard_granularity=512
>
> Note that 1.5.0 won't need this anymore, but it will need "-drive
> discard=on".  Any chance you can try to reproduce it in a different
> environment?

OK i'll try to update to 1.5.0.

Stefan