Re: [Qemu-devel] KVM guest gets aborted if blockcommit is called

[Eric Blake <eblake@redhat.com>]

[-- Attachment #1: Type: text/plain, Size: 1701 bytes --]

On 08/27/2015 02:01 PM, Christian Rößner wrote:

>>>>
>>>> I think  you may be running into a bug that is fixed by a recent patch
>>>> (after v2.4.0): 
>>>>
>>>> commit e424aff5f307227b1c2512bbb8ece891bb895cef
>>>> Author: Kevin Wolf <kwolf@redhat.com>
>>>> Date:   Thu Aug 13 10:41:50 2015 +0200
>>>>
>>>>   mirror: Fix coroutine reentrance
>>>>
>>>>
>>>> Could you retry with qemu.git/master, and see if that fixes the issue
>>>> you are seeing?
>>>
>>> Until now, everything looks perfectly. No issues. Backup is running smoothly.
>>>
>>> Thanks very much. If nothing changes until tonight, I am going to close the bug report.
>>>
>>
>> Christian,
>>
>> Great to hear, thanks for the follow-up.
> 
> Just a final result:
> 
> As I use libvirt with qemu, I used the blockcommit feature with libvirt. Running blockcommit directly with --wait --active --pivot, it may happen that the pivot fails, because the blockcommit wasn't already ready to pivot. But I do not know, if this is libvirt related or qemu. Splitting it into blockcommit and blockjob, everything works like a charm. So I have a working solution now. Thanks very much for your help and feedback.

Which version of libvirt? There was a bug up until 1.2.18 where older
libvirt got thrown off by newer qemu returning a status with 0 progress
but equal to the block job size, and libvirt interpreting it as job
complete with a result of failing the command; splitting the job into
distinct parts was indeed the right workaround as it prevented hitting
the window.  See libvirt commit eae5924

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 604 bytes --]