Re: [PATCH v2 1/6] iotests: 194: wait migration completion on target too

["Alex Bennée" <alex.bennee@linaro.org>]

Alex Bennée <alex.bennee@linaro.org> writes:

> From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
>
> It is possible, that shutdown on target occurs earlier than migration
> finish. In this case we crash in bdrv_release_dirty_bitmap_locked()
> on assertion "assert(!bdrv_dirty_bitmap_busy(bitmap));" as we do have
> busy bitmap, as bitmap migration is ongoing.
>
> We'll fix bitmap migration to gracefully cancel on early shutdown soon.
> Now let's fix iotest 194 to wait migration completion before shutdown.
>
> Note that in this test dest_vm.shutdown() is called implicitly, as vms
> used as context-providers, see __exit__() method of QEMUMachine class.
>
> Actually, not waiting migration finish is a wrong thing, but the test
> started to crash after commit ae00aa239847682
> "iotests: 194: test also migration of dirty bitmap", which added dirty
> bitmaps here. So, Fixes: tag won't hurt.
>
> Fixes: ae00aa2398476824f0eca80461da215e7cdc1c3b
> Reported-by: Thomas Huth <thuth@redhat.com>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> Tested-by: Thomas Huth <thuth@redhat.com>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> Message-Id: <20200604083341.26978-1-vsementsov@virtuozzo.com>

Obviously this patch isn't going in via plugins/next - I had it in my
tree to keep CI green and forgot to take that into account when
generating the series!

-- 
Alex Bennée