> 
> The migration shouldn't end up being set to 'reverting' twice because of
> the expected_task_state set and check in
> instance.save(expected_task_state=None).  The quota reservation could
> happen twice, so a rollback in the case of a failure in instance.save
> could be good.

A patch uploaded to fix this small windows at 
https://review.openstack.org/#/c/56288/ .

--jyh

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