Comment 18 for bug 1812935

Each time the main error described in this issue arrive we get the following error just before:

http://paste.openstack.org/show/744400/

2019-02-01 15:18:40.504 23 DEBUG oslo_db.sqlalchemy.engines [req-da88246a-b2fc-45e4-ae37-8b7e7b0f3704 1dbc237008334abcbf881d976b9ee3bb 7e14699fcedc4864bc81c50c8fe8ecd3 - default default] MySQL server mode set to STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION _check_effective_sql_mode /usr/lib/python3.6/site-packages/oslo_db/sqlalchemy/engines.py:307
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server [req-da88246a-b2fc-45e4-ae37-8b7e7b0f3704 1dbc237008334abcbf881d976b9ee3bb 7e14699fcedc4864bc81c50c8fe8ecd3 - default default] Exception during message handling: TypeError: object() takes no parameters
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/nova/conductor/manager.py", line 1262, in schedule_and_build_instances
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server context, host.service_host)
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/oslo_versionedobjects/base.py", line 184, in wrapper
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server result = fn(cls, context, *args, **kwargs)
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/nova/objects/host_mapping.py", line 100, in get_by_host
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server db_mapping = cls._get_by_host_from_db(context, host)
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 1012, in wrapper
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server return fn(*args, **kwargs)
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/nova/objects/host_mapping.py", line 95, in _get_by_host_from_db
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server raise exception.HostMappingNotFound(name=host)
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server nova.exception.HostMappingNotFound: Host 'herve.localdomain' is not mapped to any cell
2019-02-01 15:18:40.542 23 ERROR oslo_messaging.rpc.server