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From: Alberto Garcia <berto@igalia.com>
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Date: Wed, 08 Nov 2017 14:58:23 +0100
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Subject: Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs
 (iotest 30)
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To: Anton Nefedov <anton.nefedov@virtuozzo.com>, qemu-devel@nongnu.org
Cc: kwolf@redhat.com, qemu-block@nongnu.org, mreitz@redhat.com

On Tue 07 Nov 2017 05:19:41 PM CET, Anton Nefedov wrote:

> One more drainage-related thing.
> We have recently encountered an issue with parallel block jobs and it's
> not quite clear how to fix it properly, so would appreciate your ideas.
>
> The small attached tweak makes iotest 30 (-qcow2 -nocache) fail 10/10
> times on my machine.

I just wanted to quickly confirm that I can reproduce this in my system
too, I just checked QEMU v2.8 (when this was introduced) and it was
affected as well. Somehow we didn't detect this back in the day :(

I'll take a look.

Berto