Failed to recover paused instance

[Error]
Recovering host-failure was failed when there was paused state instance on the failed host.
As a result, notification status became "failed".
(Instance's state became "ACTIVE".)

And, the following message was outputted in masakari's log.

Cannot 'stop' instance <UUID> while it is in task_state rebuilding

I used the latest version of masakari.

[Cause of error]
Masakari will try to do the following processes for a paused instance when host-failure is occurred.

1. Call reset state API for the instance.
-> The instance's vm_state will be error. And task_state will be none.
2. Call evacuate API for the instance.
3. Wait until completing evacuation.
4. Call stop API for the instance.

In my opinion, there is a bug in step 3.
It will immediately go to step 4 if vm_state is error.
As a result, stop API will be failed.
Because task_state=rebuilding in that time.