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

From: Christian Rößner
Subject: Re: [Qemu-discuss] [Qemu-devel] KVM guest gets aborted if blockcommit is called
Date: Thu, 27 Aug 2015 22:22:14 +0200

> Am 27.08.2015 um 22:15 schrieb Eric Blake <address@hidden>:
> 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 <address@hidden>
>>>>> 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

As far as I can see, I use libvirt 1.2.18 with qemu master branch (yesterday 


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