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[Takashi Kajinami <1884762@xxxxxxxxxxxxxxxxxx>]

I'm closing this because of inactivity. I've never seen this problem,
either.

** Changed in: oslo.config
       Status: New => Invalid

** Changed in: nova
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1884762

Title:
  Unhandled error: RuntimeError: dictionary changed size during
  iteration

Status in OpenStack Compute (nova):
  Invalid
Status in oslo.config:
  Invalid

Bug description:
  Observed in CentOS8 nova-scheduler logs:

  2020-06-23 13:37:46.779 23 ERROR nova Traceback (most recent call last):
  2020-06-23 13:37:46.779 23 ERROR nova   File "/usr/bin/nova-scheduler", line 10, in <module>
  2020-06-23 13:37:46.779 23 ERROR nova     sys.exit(main())
  2020-06-23 13:37:46.779 23 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/cmd/scheduler.py", line 53, in main
  2020-06-23 13:37:46.779 23 ERROR nova     service.serve(server, workers=workers)
  2020-06-23 13:37:46.779 23 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/service.py", line 489, in serve
  2020-06-23 13:37:46.779 23 ERROR nova     restart_method='mutate')
  2020-06-23 13:37:46.779 23 ERROR nova   File "/usr/lib/python3.6/site-packages/oslo_service/service.py", line 842, in launch
  2020-06-23 13:37:46.779 23 ERROR nova     launcher.launch_service(service, workers=workers)
  2020-06-23 13:37:46.779 23 ERROR nova   File "/usr/lib/python3.6/site-packages/oslo_service/service.py", line 606, in launch_service
  2020-06-23 13:37:46.779 23 ERROR nova     self._start_child(wrap)
  2020-06-23 13:37:46.779 23 ERROR nova   File "/usr/lib/python3.6/site-packages/oslo_service/service.py", line 575, in _start_child
  2020-06-23 13:37:46.779 23 ERROR nova     self.launcher.restart()
  2020-06-23 13:37:46.779 23 ERROR nova   File "/usr/lib/python3.6/site-packages/oslo_service/service.py", line 311, in restart
  2020-06-23 13:37:46.779 23 ERROR nova     self.conf.mutate_config_files()
  2020-06-23 13:37:46.779 23 ERROR nova   File "/usr/lib/python3.6/site-packages/oslo_config/cfg.py", line 3013, in mutate_config_files
  2020-06-23 13:37:46.779 23 ERROR nova     self._warn_immutability()
  2020-06-23 13:37:46.779 23 ERROR nova   File "/usr/lib/python3.6/site-packages/oslo_config/cfg.py", line 3040, in _warn_immutability
  2020-06-23 13:37:46.779 23 ERROR nova     for info, group in self._all_opt_infos():
  2020-06-23 13:37:46.779 23 ERROR nova   File "/usr/lib/python3.6/site-packages/oslo_config/cfg.py", line 2502, in _all_opt_infos
  2020-06-23 13:37:46.779 23 ERROR nova     for info in self._opts.values():
  2020-06-23 13:37:46.779 23 ERROR nova RuntimeError: dictionary changed size during iteration
  2020-06-23 13:37:46.779 23 ERROR nova
  2020-06-23 13:37:46.780 20 CRITICAL nova [req-739357c3-918b-4778-ab8b-282fc7fad943 - - - - -] Unhandled error: RuntimeError: dictionary changed size during iteration

  OpenStack installed using RDO packages
  Package versions:
  (nova-scheduler)[nova@spsrc-controller-2 /]$ rpm -vqa | grep nova
  python3-nova-20.2.0-1.el8.noarch
  python3-novaclient-15.1.0-1.el8.noarch
  openstack-nova-common-20.2.0-1.el8.noarch
  openstack-nova-scheduler-20.2.0-1.el8.noarch
  (nova-scheduler)[nova@spsrc-controller-2 /]$ rpm -vqa | grep oslo
  python-oslo-utils-lang-3.41.5-1.el8.noarch
  python-oslo-i18n-lang-3.24.0-2.el8.noarch
  python-oslo-cache-lang-1.37.0-2.el8.noarch
  python3-oslo-concurrency-3.30.0-2.el8.noarch
  python3-oslo-messaging-10.2.0-2.el8.noarch
  python-oslo-versionedobjects-lang-1.36.1-1.el8.noarch
  python-oslo-policy-lang-2.3.3-1.el8.noarch
  python-oslo-log-lang-3.44.2-1.el8.noarch
  python3-oslo-i18n-3.24.0-2.el8.noarch
  python-oslo-concurrency-lang-3.30.0-2.el8.noarch
  python3-oslo-serialization-2.29.2-2.el8.noarch
  python3-oslo-config-6.11.2-1.el8.noarch
  python3-oslo-log-3.44.2-1.el8.noarch
  python3-oslo-service-1.40.2-2.el8.noarch
  python3-oslo-middleware-3.38.1-2.el8.noarch
  python-oslo-vmware-lang-2.34.1-1.el8.noarch
  python3-oslo-privsep-1.33.3-1.el8.noarch
  python3-oslo-vmware-2.34.1-1.el8.noarch
  python3-oslo-db-5.0.2-2.el8.noarch
  python3-oslo-policy-2.3.3-1.el8.noarch
  python3-oslo-reports-1.30.0-1.el8.noarch
  python3-oslo-rootwrap-5.16.1-1.el8.noarch
  python-oslo-privsep-lang-1.33.3-1.el8.noarch
  python-oslo-middleware-lang-3.38.1-2.el8.noarch
  python-oslo-db-lang-5.0.2-2.el8.noarch
  python3-oslo-utils-3.41.5-1.el8.noarch
  python3-oslo-context-2.23.0-2.el8.noarch
  python3-oslo-cache-1.37.0-2.el8.noarch
  python3-oslo-versionedobjects-1.36.1-1.el8.noarch
  python3-oslo-upgradecheck-0.3.2-1.el8.noarch

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