Re: [Qemu-devel] [Qemu-devel for-3.1?] [PATCH v2 0/2] mirror dead-lock

[Max Reitz]

On 29.11.18 15:14, Eric Blake wrote:
> On 11/29/18 4:17 AM, Vladimir Sementsov-Ogievskiy wrote:
>> Hi all!
>>
>> v2: add fix:)
>>
>> We've faced the following mirror bug:
>>
>> Just run mirror on qcow2 image more than 1G, and qemu is in dead lock.
> 
> How long has the bug been present?  Based on patch 1 mentioning commit
> 2e1990b26e5 (in 3.0), I'm guessing that this bug is not a regression
> specific to 3.1?  If so, then maybe we're better off deferring this to
> 4.0 just relying on qemu-stable (already cc'd); on the other hand, if it
> is an easy-to-trigger deadlock on something the user is likely to do,
> can we justify it being severe enough to warrant -rc4?

The test does indeed break on 3.0.0 (and passes on 2.12.0).  But mirror
just not working from non-trivial qcow2 images?  To me, that is a reason
to delay the release, even though it is not a regression.

Max

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