Comment 3 for bug 1868326

Since 2020-05-22 our full_stack/next_series_upgrade xenial-queens CI tests [0] fail with

2020-05-26 17:51:12 DEBUG post-series-upgrade Traceback (most recent call last):
2020-05-26 17:51:12 DEBUG post-series-upgrade File "/var/lib/juju/agents/unit-mysql-2/charm/hooks/post-series-upgrade", line 1151, in <module>
2020-05-26 17:51:12 DEBUG post-series-upgrade main()
2020-05-26 17:51:12 DEBUG post-series-upgrade File "/var/lib/juju/agents/unit-mysql-2/charm/hooks/post-series-upgrade", line 1141, in main
2020-05-26 17:51:12 DEBUG post-series-upgrade hooks.execute(sys.argv)
2020-05-26 17:51:12 DEBUG post-series-upgrade File "/var/lib/juju/agents/unit-mysql-2/charm/charmhelpers/core/hookenv.py", line 943, in execute
2020-05-26 17:51:12 DEBUG post-series-upgrade self._hooks[hook_name]()
2020-05-26 17:51:12 DEBUG post-series-upgrade File "/var/lib/juju/agents/unit-mysql-2/charm/hooks/post-series-upgrade", line 467, in series_upgrade
2020-05-26 17:51:12 DEBUG post-series-upgrade resume_unit_helper(register_configs())
2020-05-26 17:51:12 DEBUG post-series-upgrade File "/var/lib/juju/agents/unit-mysql-2/charm/hooks/percona_utils.py", line 854, in resume_unit_helper
2020-05-26 17:51:12 DEBUG post-series-upgrade _pause_resume_helper(resume_unit, configs)
2020-05-26 17:51:12 DEBUG post-series-upgrade File "/var/lib/juju/agents/unit-mysql-2/charm/hooks/percona_utils.py", line 868, in _pause_resume_helper
2020-05-26 17:51:12 DEBUG post-series-upgrade ports=None)
2020-05-26 17:51:12 DEBUG post-series-upgrade File "/var/lib/juju/agents/unit-mysql-2/charm/charmhelpers/contrib/openstack/utils.py", line 1635, in resume_unit
2020-05-26 17:51:12 DEBUG post-series-upgrade raise Exception("Couldn't resume: {}".format("; ".join(messages)))
2020-05-26 17:51:12 DEBUG post-series-upgrade Exception: Couldn't resume: Unit waiting to bootstrap ('seeded' file missing)
2020-05-26 17:51:12 ERROR juju.worker.uniter.operation runhook.go:132 hook "post-series-upgrade" failed: exit status 1

I wonder if this is caused by this change. Re-opening and attaching crashdump.

0: http://osci:8080/job/mojo_runner/22606/consoleFull