Re: [Qemu-devel] [PATCH] aio-posix: Fix return value of aio_poll()

[Paolo Bonzini]

Il 22/01/2013 08:02, Dietmar Maurer ha scritto:
>> aio_poll() must return true if any work is still pending, even if it didn't 
>> make
>> > progress, so that qemu_aio_wait() doesn't return too early.
>> > The possibility of returning early occasionally lead to a failed assertion 
>> > in
>> > bdrv_drain_all(), when some in-flight request was missed and the function
>> > didn't really drain all requests.
> I still have problem with bdrv_drain_all() and my backup block job.
> If I reset/suspend/resume/ the VM during a backup job run I get:
> 
> block.c:1221: bdrv_drain_all: Assertion `((&bs->tracked_requests)->lh_first 
> == ((void *)0))' failed.
> Aborted
> 
> I am not 100% sure, but I think a simple qemu_aio_wait() is not enough to 
> ensure that
> a copy-on-write action has finished.

Are you using timers in any way?

Paolo

> Any idea how to solve that problem?
> 
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