Comment 65 for bug 1404867

This bug still can happen if instance transitioned into the ERROR state after TooManyInstances exception in nova-conductor [1] with quota.recheck_quota=True being set, because in this case instance isn't buried in the cell0 database and instance_bdms isn't created in the nova cell database. So _local_cleanup_bdm_volumes() doesn't have bdm to cleanup.

[1] https://github.com/openstack/nova/blob/stable/rocky/nova/conductor/manager.py#L1308