> (nova-compute)[nova@compute5 /]$ pip freeze | grep nova
> nova==13.0.0.0rc4.dev10675
13.0.0 means Mitaka and dev10675 means you have 10675 commits top of Mitaka so my failed trials top of Queens 17.0.2 is explained. Could you please try to reproduce the problem top of an Upstream Nova version (or at least try to have limited amount of forking in your environment where you reproduce)? It is hard to tell what happens in your env running different code than what I can see in my env.
> (nova-compute) [nova@compute5 /]$ pip freeze | grep nova 0.0.0rc4. dev10675
> nova==13.
13.0.0 means Mitaka and dev10675 means you have 10675 commits top of Mitaka so my failed trials top of Queens 17.0.2 is explained. Could you please try to reproduce the problem top of an Upstream Nova version (or at least try to have limited amount of forking in your environment where you reproduce)? It is hard to tell what happens in your env running different code than what I can see in my env.