I've found two possible bugs, one with the online_data_migrations and one after services are started again (ignoring the online_data_migration failures). The online_data_migration bug is located at: https://bugs.launchpad.net/nova/+bug/1630446 The post non-migration bug is located at: https://bugs.launchpad.net/nova/+bug/1630448 At the moment I think the first bug is likely the cause of the second bug, but don't have enough info to verify or fix it. -- Matthew Thode (prometheanfire)