May 20 19:06:05.834951 np0000175403 systemd[1]: Started devstack@barbican-keystone-listener.service - Devstack devstack@barbican-keystone-listener.service.
May 20 19:06:06.137861 np0000175403 barbican-keystone-listener[117942]: /opt/stack/data/venv/lib/python3.12/site-packages/oslo_utils/importutils.py:77: EventletDeprecationWarning:
May 20 19:06:06.137861 np0000175403 barbican-keystone-listener[117942]: Eventlet is deprecated. It is currently being maintained in bugfix mode, and
May 20 19:06:06.137861 np0000175403 barbican-keystone-listener[117942]: we strongly recommend against using it for new projects.
May 20 19:06:06.137861 np0000175403 barbican-keystone-listener[117942]: If you are already using Eventlet, we recommend migrating to a different
May 20 19:06:06.137861 np0000175403 barbican-keystone-listener[117942]: framework.  For more detail see
May 20 19:06:06.137861 np0000175403 barbican-keystone-listener[117942]: https://eventlet.readthedocs.io/en/latest/asyncio/migration.html
May 20 19:06:06.137861 np0000175403 barbican-keystone-listener[117942]:   __import__(import_str)
May 20 19:06:06.806866 np0000175403 barbican-keystone-listener[117942]: Traceback (most recent call last):
May 20 19:06:06.806866 np0000175403 barbican-keystone-listener[117942]:   File "/opt/stack/data/venv/bin/barbican-keystone-listener", line 6, in <module>
May 20 19:06:06.807095 np0000175403 barbican-keystone-listener[117942]:     sys.exit(main())
May 20 19:06:06.807095 np0000175403 barbican-keystone-listener[117942]:              ^^^^^^
May 20 19:06:06.807095 np0000175403 barbican-keystone-listener[117942]:   File "/opt/stack/barbican/barbican/cmd/keystone_listener.py", line 40, in main
May 20 19:06:06.807095 np0000175403 barbican-keystone-listener[117942]:     init_backend(BackendType.THREADING)
May 20 19:06:06.807095 np0000175403 barbican-keystone-listener[117942]:   File "/opt/stack/data/venv/lib/python3.12/site-packages/oslo_service/backend/__init__.py", line 94, in init_backend
May 20 19:06:06.807095 np0000175403 barbican-keystone-listener[117942]:     raise exceptions.BackendAlreadySelected(
May 20 19:06:06.807095 np0000175403 barbican-keystone-listener[117942]: oslo_service.backend.exceptions.BackendAlreadySelected: Backend already set to 'eventlet', cannot reinitialize with 'threading'
May 20 19:06:07.024876 np0000175403 systemd[1]: devstack@barbican-keystone-listener.service: Main process exited, code=exited, status=1/FAILURE
May 20 19:06:07.024903 np0000175403 systemd[1]: devstack@barbican-keystone-listener.service: Failed with result 'exit-code'.
May 20 19:06:07.025550 np0000175403 systemd[1]: devstack@barbican-keystone-listener.service: Consumed 1.150s CPU time.