Re: [Qemu-devel] [PULL 0/5] NBD patches for 2017-09-06

[Eric Blake]

On 09/07/2017 07:26 AM, Peter Maydell wrote:
> On 6 September 2017 at 16:21, Eric Blake <address@hidden> wrote:
>> The following changes since commit b07d1c2f5607489d4d4a6a65ce36a3e896ac065e:
>>
>>   Revert "kvm: use DIV_ROUND_UP" (2017-09-05 18:55:40 +0100)
>>
>> are available in the git repository at:
>>
>>   git://repo.or.cz/qemu/ericb.git tags/pull-nbd-2017-09-06
>>
>> for you to fetch changes up to 030fa7f6f950f5c8963f1dee8e6bb7387ed86a99:
>>
>>   nbd: Use new qio_channel_*_all() functions (2017-09-06 10:11:54 -0500)
>>

> I get an error in test-aio-multithread (clang, linux, x86-64):
>   GTESTER tests/test-aio-multithread
> **
> ERROR:/home/petmay01/linaro/qemu-for-merges/tests/test-aio-multithread.c:368:test_multi_fair_mutex:
> assertion failed (counter == atomic_counter): (532693 == 532694)
> GTester: last random seed: R02Sa68ef1eb4822359eb869642ff26180df

I wonder if that is a rare but pre-existing bug, as I don't see any use
of qio_channel in test-aio-multithread, and therefore no obvious way
that this series would be the cause of the intermittent failure.

> 
> Seems to be very intermittent, though -- I haven't been able
> to reproduce it, even with loading the box up with a
> compile job at the same time.

Paolo, this appears to be your area of expertise.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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