Description of problem:
We see stack trace as following https://gist.github.com/smalleni/a6eb01825e708c8e9d6974537444170a when running some performance and scale tests of creating neutron resources.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Create bunch of neutron resources
DBReferenceErrors on logs
This was fixed in https://review.openstack.org/#/c/498881/ and backported on Sep-13. Once a new package that includes the backport is used, this should not appear anymore.
Can you please suggest how to verify?
What rally test and what spec have you used?
I don't see DBReferenceError when running tempest tests.
If you experience such errors again please supply information how to reproduce it.