[pve-devel] [Qemu-devel] segfault in aio_bh_poll async.c:80 WAS: Re: kvm process disappears

[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 at 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?

Paolo