Re: [PATCH] iotests: 194: wait migration completion on target too

[Eric Blake <eblake@redhat.com>]

On 6/4/20 3:33 AM, Vladimir Sementsov-Ogievskiy wrote:
> 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>
> ---
>   tests/qemu-iotests/194     | 10 ++++++++++
>   tests/qemu-iotests/194.out |  5 +++++
>   2 files changed, 15 insertions(+)

Reviewed-by: Eric Blake <eblake@redhat.com>

Will queue through my NBD tree.

> 
> diff --git a/tests/qemu-iotests/194 b/tests/qemu-iotests/194
> index 3fad7c6c1a..6dc2bc94d7 100755
> --- a/tests/qemu-iotests/194
> +++ b/tests/qemu-iotests/194
> @@ -87,4 +87,14 @@ with iotests.FilePath('source.img') as source_img_path, \
>               iotests.log(dest_vm.qmp('nbd-server-stop'))
>               break
>   
> +    iotests.log('Wait migration completion on target...')

Do you mind if I s/Wait/Wait for/ here and in the .out?

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org