Hi everyone,

We just had our gating break due to a change merging inside barbican-tempest-plugin which is the following:

https://review.opendev.org/#/c/515210/

It is resulting in an exception in our CI:

2020-08-26 18:04:32.663188 | controller | Response - Headers: {'content-length': '257', 'content-type': 'application/json', 'x-openstack-request-id': 'req-7f55e463-c3de-445e-a814-ef79c5f21235', 'connection': 'close', 'status': '409', 'content-location': 'http://glance.openstack.svc.cluster.local/v2/images/dec14e17-0870-415f-82a6-... 2020-08-26 18:04:32.663200 | controller | Body: b'{"message": "Image dec14e17-0870-415f-82a6-140c1b7e4a39 could not be deleted because it is in use: The image cannot be deleted because it is in use through the backend store outside of Glance.<br /><br />\n\n\n", "code": "409 Conflict", "title": "Conflict"}'

This is usually because it's trying to delete the Glance image before deleting an instance that is using it, the specific test that is failing is:

barbican_tempest_plugin.tests.scenario.test_certificate_validation.CertificateValidationTest.test_signed_image_invalid_cert_boot_failure[compute,id-6d354881-35a6-4568-94b8-2204bbf67b29,image]

This test landed yesterday, we're blacklisting the scenario right now. I do find it quite interesting that in the logs here:

http://paste.openstack.org/show/797186/

That the instance reports that it _does_ indeed delete it, so maybe we are trying to delete the image afterwards _too quickly_ and need to wait for Nova to clean up?

I'd love to enable that test again and continue full coverage, happy to hear discussion.

Thanks Mohammed