Comment 10 for bug 1811235

Oh yes I see:

https://github.com/openstack/nova/blob/stable/ocata/nova/compute/manager.py#L3798

That catches the UnableToMigrateToSelf because it doesn't reschedule and re-raises UnableToMigrateToSelf from _prep_resize which then sets the instance to error status:

https://github.com/openstack/nova/blob/stable/ocata/nova/compute/manager.py#L6801

That exception handler is kind of a pain - we have similar issues with rebuild failing and setting the instance to error status when it probably shouldn't.

In this case we should probably raise InstanceFaultRollback when we hit UnableToMigrateToSelf but even that would set the instance status back to active which it's not in this case (they resized a stopped VM).

And yes that code still exists on master...so this is a valid bug, but has less to do with the 2.56 microversion.