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Re: [Qemu-devel] "iothread: release iothread around aio_poll" causes ran
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From: |
Christian Borntraeger |
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Subject: |
Re: [Qemu-devel] "iothread: release iothread around aio_poll" causes random hangs at startup |
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Date: |
Thu, 16 Jul 2015 13:24:19 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
Am 16.07.2015 um 13:20 schrieb Paolo Bonzini:
>
>
> On 16/07/2015 13:03, Christian Borntraeger wrote:
>> For what its worth, I can no longer reproduce the issue on
>> current master + cherry-pick of a0710f7995f (iothread: release iothread
>> around aio_poll)
>>
>> bisect tells me that
>>
>> commit 53ec73e264f481b79b52efcadc9ceb8f8996975c
>> Author: Fam Zheng <address@hidden>
>> AuthorDate: Fri May 29 18:53:14 2015 +0800
>> Commit: Stefan Hajnoczi <address@hidden>
>> CommitDate: Tue Jul 7 14:27:14 2015 +0100
>>
>> block: Use bdrv_drain to replace uncessary bdrv_drain_all
>>
>> made the problem will blk-null go away. I still dont understand why.
>
> It could be related to the AioContext problem that I'm fixing these
> days, too. Good news, we'll requeue the patch for 2.5.
That was also something that I had in mind (in fact I retested this to check
the ctx patch). master + cherry-pick of a0710f7995f + revert of 53ec73e26 +
this fix
still fails, so it was (is?) a different issue. The interesting part is that
this
problem required 2 or more disk (and we replace drain_all with single drains) so
it somewhat sounds plausible.
Christian