With a stable/train devstack I cannot reproduce the above stack trace by stopping or restarting the nova-scheduler.
The relevant oslo libs are at the same version in my env as in your and I don't see any relevant changes between nova 20.2.0 and stable/train HEAD. I hope oslo folks will have some idea as without reproduction I cannot really debug this further. Marking this as incomplete from Nova perspective until more information is provided. Feel free to set it back to New later.
With a stable/train devstack I cannot reproduce the above stack trace by stopping or restarting the nova-scheduler.
The relevant oslo libs are at the same version in my env as in your and I don't see any relevant changes between nova 20.2.0 and stable/train HEAD. I hope oslo folks will have some idea as without reproduction I cannot really debug this further. Marking this as incomplete from Nova perspective until more information is provided. Feel free to set it back to New later.