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[Bug 1882062] [NEW] neutron-ovn-db-sync-util fails with Mechanism driver 'ovn-sync' failed in create_port_postcommit: AttributeError: 'PortContext' object has no attribute 'session'

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Frode Nordahl <1882062@xxxxxxxxxxxxxxxxxx>
Date: Thu, 04 Jun 2020 09:47:01 -0000
Reply-to: Bug 1882062 <1882062@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

This appears to be a mishap in the move from networking-ovn -> neutron
codebase.

2020-06-04 09:45:21.603 968615 INFO neutron.services.qos.drivers.ovn.driver [req-13b1fc86-4b97-4684-a295-16ec9658d128 - - - - -] Starting OVNQosDriver
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers [req-13b1fc86-4b97-4684-a295-16ec9658d128 - - - - -] Mechanism driver 'ovn-sync' failed in create_port_postcommit: AttributeError: 'PortContext' object has no attribute 'session'
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers Traceback (most recent call last):
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/managers.py", line 477, in _call_on_drivers
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers     getattr(driver.obj, method_name)(context)
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers   File "/usr/lib/python3/dist-packages/neutron/cmd/ovn/neutron_ovn_db_sync_util.py", line 67, in create_port_postcommit
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers     self.ovn_client.create_port(context, port)
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py", line 442, in create_port
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers     db_rev.bump_revision(context, port, ovn_const.TYPE_PORTS)
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 232, in wrapped
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers     method = f if context.session.is_active else f_with_retry
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers AttributeError: 'PortContext' object has no attribute 'session'
2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers 
2020-06-04 09:45:21.974 968615 ERROR neutron.plugins.ml2.plugin [req-13b1fc86-4b97-4684-a295-16ec9658d128 - - - - -] mechanism_manager.create_port_postcommit failed, deleting port '669df769-a7b2-4dfe-95d6-5f5ce7f6bb94': neutron.plugins.ml2.common.exceptions.MechanismDriverError
2020-06-04 09:45:23.446 968615 CRITICAL neutron [req-13b1fc86-4b97-4684-a295-16ec9658d128 - - - - -] Unhandled error: neutron.plugins.ml2.common.exceptions.MechanismDriverError
2020-06-04 09:45:23.446 968615 ERROR neutron Traceback (most recent call last):
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/bin/neutron-ovn-db-sync-util", line 10, in <module>
2020-06-04 09:45:23.446 968615 ERROR neutron     sys.exit(main())
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/cmd/ovn/neutron_ovn_db_sync_util.py", line 216, in main
2020-06-04 09:45:23.446 968615 ERROR neutron     synchronizer.do_sync()
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_db_sync.py", line 93, in do_sync
2020-06-04 09:45:23.446 968615 ERROR neutron     self.sync_networks_ports_and_dhcp_opts(ctx)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_db_sync.py", line 1008, in sync_networks_ports_and_dhcp_opts
2020-06-04 09:45:23.446 968615 ERROR neutron     self._sync_metadata_ports(ctx, db_ports)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_db_sync.py", line 920, in _sync_metadata_ports
2020-06-04 09:45:23.446 968615 ERROR neutron     self._ovn_client.create_metadata_port(ctx, net)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py", line 2277, in create_metadata_port
2020-06-04 09:45:23.446 968615 ERROR neutron     p_utils.create_port(self._plugin, context, port)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/plugins/utils.py", line 335, in create_port
2020-06-04 09:45:23.446 968615 ERROR neutron     return core_plugin.create_port(
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/common/utils.py", line 687, in inner
2020-06-04 09:45:23.446 968615 ERROR neutron     return f(self, context, *args, **kwargs)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 233, in wrapped
2020-06-04 09:45:23.446 968615 ERROR neutron     return method(*args, **kwargs)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 139, in wrapped
2020-06-04 09:45:23.446 968615 ERROR neutron     setattr(e, '_RETRY_EXCEEDED', True)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2020-06-04 09:45:23.446 968615 ERROR neutron     self.force_reraise()
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2020-06-04 09:45:23.446 968615 ERROR neutron     six.reraise(self.type_, self.value, self.tb)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
2020-06-04 09:45:23.446 968615 ERROR neutron     raise value
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 135, in wrapped
2020-06-04 09:45:23.446 968615 ERROR neutron     return f(*args, **kwargs)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_db/api.py", line 154, in wrapper
2020-06-04 09:45:23.446 968615 ERROR neutron     ectxt.value = e.inner_exc
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2020-06-04 09:45:23.446 968615 ERROR neutron     self.force_reraise()
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2020-06-04 09:45:23.446 968615 ERROR neutron     six.reraise(self.type_, self.value, self.tb)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
2020-06-04 09:45:23.446 968615 ERROR neutron     raise value
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_db/api.py", line 142, in wrapper
2020-06-04 09:45:23.446 968615 ERROR neutron     return f(*args, **kwargs)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 183, in wrapped
2020-06-04 09:45:23.446 968615 ERROR neutron     LOG.debug("Retry wrapper got retriable exception: %s", e)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2020-06-04 09:45:23.446 968615 ERROR neutron     self.force_reraise()
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2020-06-04 09:45:23.446 968615 ERROR neutron     six.reraise(self.type_, self.value, self.tb)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
2020-06-04 09:45:23.446 968615 ERROR neutron     raise value
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 179, in wrapped
2020-06-04 09:45:23.446 968615 ERROR neutron     return f(*dup_args, **dup_kwargs)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/plugin.py", line 1410, in create_port
2020-06-04 09:45:23.446 968615 ERROR neutron     return self._after_create_port(context, result, mech_context)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/plugin.py", line 1423, in _after_create_port
2020-06-04 09:45:23.446 968615 ERROR neutron     self.delete_port(context, result['id'], l3_port_check=False)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2020-06-04 09:45:23.446 968615 ERROR neutron     self.force_reraise()
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2020-06-04 09:45:23.446 968615 ERROR neutron     six.reraise(self.type_, self.value, self.tb)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
2020-06-04 09:45:23.446 968615 ERROR neutron     raise value
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/plugin.py", line 1418, in _after_create_port
2020-06-04 09:45:23.446 968615 ERROR neutron     self.mechanism_manager.create_port_postcommit(mech_context)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/managers.py", line 715, in create_port_postcommit
2020-06-04 09:45:23.446 968615 ERROR neutron     self._call_on_drivers("create_port_postcommit", context)
2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/managers.py", line 493, in _call_on_drivers
2020-06-04 09:45:23.446 968615 ERROR neutron     raise ml2_exc.MechanismDriverError(
2020-06-04 09:45:23.446 968615 ERROR neutron neutron.plugins.ml2.common.exceptions.MechanismDriverError
2020-06-04 09:45:23.446 968615 ERROR neutron

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1882062

Title:
  neutron-ovn-db-sync-util fails with Mechanism driver 'ovn-sync' failed
  in create_port_postcommit: AttributeError: 'PortContext' object has no
  attribute 'session'

Status in neutron:
  New

Bug description:
  This appears to be a mishap in the move from networking-ovn -> neutron
  codebase.

  2020-06-04 09:45:21.603 968615 INFO neutron.services.qos.drivers.ovn.driver [req-13b1fc86-4b97-4684-a295-16ec9658d128 - - - - -] Starting OVNQosDriver
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers [req-13b1fc86-4b97-4684-a295-16ec9658d128 - - - - -] Mechanism driver 'ovn-sync' failed in create_port_postcommit: AttributeError: 'PortContext' object has no attribute 'session'
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers Traceback (most recent call last):
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/managers.py", line 477, in _call_on_drivers
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers     getattr(driver.obj, method_name)(context)
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers   File "/usr/lib/python3/dist-packages/neutron/cmd/ovn/neutron_ovn_db_sync_util.py", line 67, in create_port_postcommit
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers     self.ovn_client.create_port(context, port)
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py", line 442, in create_port
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers     db_rev.bump_revision(context, port, ovn_const.TYPE_PORTS)
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 232, in wrapped
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers     method = f if context.session.is_active else f_with_retry
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers AttributeError: 'PortContext' object has no attribute 'session'
  2020-06-04 09:45:21.965 968615 ERROR neutron.plugins.ml2.managers 
  2020-06-04 09:45:21.974 968615 ERROR neutron.plugins.ml2.plugin [req-13b1fc86-4b97-4684-a295-16ec9658d128 - - - - -] mechanism_manager.create_port_postcommit failed, deleting port '669df769-a7b2-4dfe-95d6-5f5ce7f6bb94': neutron.plugins.ml2.common.exceptions.MechanismDriverError
  2020-06-04 09:45:23.446 968615 CRITICAL neutron [req-13b1fc86-4b97-4684-a295-16ec9658d128 - - - - -] Unhandled error: neutron.plugins.ml2.common.exceptions.MechanismDriverError
  2020-06-04 09:45:23.446 968615 ERROR neutron Traceback (most recent call last):
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/bin/neutron-ovn-db-sync-util", line 10, in <module>
  2020-06-04 09:45:23.446 968615 ERROR neutron     sys.exit(main())
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/cmd/ovn/neutron_ovn_db_sync_util.py", line 216, in main
  2020-06-04 09:45:23.446 968615 ERROR neutron     synchronizer.do_sync()
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_db_sync.py", line 93, in do_sync
  2020-06-04 09:45:23.446 968615 ERROR neutron     self.sync_networks_ports_and_dhcp_opts(ctx)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_db_sync.py", line 1008, in sync_networks_ports_and_dhcp_opts
  2020-06-04 09:45:23.446 968615 ERROR neutron     self._sync_metadata_ports(ctx, db_ports)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_db_sync.py", line 920, in _sync_metadata_ports
  2020-06-04 09:45:23.446 968615 ERROR neutron     self._ovn_client.create_metadata_port(ctx, net)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py", line 2277, in create_metadata_port
  2020-06-04 09:45:23.446 968615 ERROR neutron     p_utils.create_port(self._plugin, context, port)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/plugins/utils.py", line 335, in create_port
  2020-06-04 09:45:23.446 968615 ERROR neutron     return core_plugin.create_port(
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/common/utils.py", line 687, in inner
  2020-06-04 09:45:23.446 968615 ERROR neutron     return f(self, context, *args, **kwargs)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 233, in wrapped
  2020-06-04 09:45:23.446 968615 ERROR neutron     return method(*args, **kwargs)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 139, in wrapped
  2020-06-04 09:45:23.446 968615 ERROR neutron     setattr(e, '_RETRY_EXCEEDED', True)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2020-06-04 09:45:23.446 968615 ERROR neutron     self.force_reraise()
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2020-06-04 09:45:23.446 968615 ERROR neutron     six.reraise(self.type_, self.value, self.tb)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
  2020-06-04 09:45:23.446 968615 ERROR neutron     raise value
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 135, in wrapped
  2020-06-04 09:45:23.446 968615 ERROR neutron     return f(*args, **kwargs)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_db/api.py", line 154, in wrapper
  2020-06-04 09:45:23.446 968615 ERROR neutron     ectxt.value = e.inner_exc
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2020-06-04 09:45:23.446 968615 ERROR neutron     self.force_reraise()
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2020-06-04 09:45:23.446 968615 ERROR neutron     six.reraise(self.type_, self.value, self.tb)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
  2020-06-04 09:45:23.446 968615 ERROR neutron     raise value
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_db/api.py", line 142, in wrapper
  2020-06-04 09:45:23.446 968615 ERROR neutron     return f(*args, **kwargs)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 183, in wrapped
  2020-06-04 09:45:23.446 968615 ERROR neutron     LOG.debug("Retry wrapper got retriable exception: %s", e)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2020-06-04 09:45:23.446 968615 ERROR neutron     self.force_reraise()
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2020-06-04 09:45:23.446 968615 ERROR neutron     six.reraise(self.type_, self.value, self.tb)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
  2020-06-04 09:45:23.446 968615 ERROR neutron     raise value
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron_lib/db/api.py", line 179, in wrapped
  2020-06-04 09:45:23.446 968615 ERROR neutron     return f(*dup_args, **dup_kwargs)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/plugin.py", line 1410, in create_port
  2020-06-04 09:45:23.446 968615 ERROR neutron     return self._after_create_port(context, result, mech_context)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/plugin.py", line 1423, in _after_create_port
  2020-06-04 09:45:23.446 968615 ERROR neutron     self.delete_port(context, result['id'], l3_port_check=False)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2020-06-04 09:45:23.446 968615 ERROR neutron     self.force_reraise()
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2020-06-04 09:45:23.446 968615 ERROR neutron     six.reraise(self.type_, self.value, self.tb)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
  2020-06-04 09:45:23.446 968615 ERROR neutron     raise value
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/plugin.py", line 1418, in _after_create_port
  2020-06-04 09:45:23.446 968615 ERROR neutron     self.mechanism_manager.create_port_postcommit(mech_context)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/managers.py", line 715, in create_port_postcommit
  2020-06-04 09:45:23.446 968615 ERROR neutron     self._call_on_drivers("create_port_postcommit", context)
  2020-06-04 09:45:23.446 968615 ERROR neutron   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/managers.py", line 493, in _call_on_drivers
  2020-06-04 09:45:23.446 968615 ERROR neutron     raise ml2_exc.MechanismDriverError(
  2020-06-04 09:45:23.446 968615 ERROR neutron neutron.plugins.ml2.common.exceptions.MechanismDriverError
  2020-06-04 09:45:23.446 968615 ERROR neutron

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Follow ups

[Bug 1882062] Re: neutron-ovn-db-sync-util fails with Mechanism driver 'ovn-sync' failed in create_port_postcommit: AttributeError: 'PortContext' object has no attribute 'session'
From: Frode Nordahl, 2020-06-04