Hi, It happens from time to time, not consistently, with the latest kolla/centos-binary-neutron-server:ussuri container image.

From the bottome of traceback, it seems self._ovn is None. Any clues how this can happen? I don't see other suspicious logging in Neutron and OVN. ===================== File "/usr/lib/python3.6/site-packages/neutron/services/ovn_l3/plugin.py", line 477, in get_router_availability_zones ERROR neutron.api.v2.resource lr = self._ovn.get_lrouter(router['id']) ERROR neutron.api.v2.resource AttributeError: 'NoneType' object has no attribute 'get_lrouter' =====================

Here is the full traceback. ===================== neutron.api.v2.resource [req-bf2230aa-0491-4caa-b5f7-169d37009672 b8de8d37a30147fd98681c22fc515874 b5938e7ebb0645e396b19e99bb7f9868 - default default] index failed: No details.: AttributeError: 'NoneType' object has no attribute 'get_lrouter' neutron.api.v2.resource Traceback (most recent call last): neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron/api/v2/resource.py", line 98, in resource neutron.api.v2.resource result = method(request=request, **args) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/api.py", line 139, in wrapped neutron.api.v2.resource setattr(e, '_RETRY_EXCEEDED', True) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__ neutron.api.v2.resource self.force_reraise() neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise neutron.api.v2.resource raise value neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/api.py", line 135, in wrapped neutron.api.v2.resource return f(*args, **kwargs) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_db/api.py", line 154, in wrapper neutron.api.v2.resource ectxt.value = e.inner_exc neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__ neutron.api.v2.resource self.force_reraise() neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise neutron.api.v2.resource raise value neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_db/api.py", line 142, in wrapper neutron.api.v2.resource return f(*args, **kwargs) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/api.py", line 183, in wrapped neutron.api.v2.resource LOG.debug("Retry wrapper got retriable exception: %s", e) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__ neutron.api.v2.resource self.force_reraise() neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise neutron.api.v2.resource raise value neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/api.py", line 179, in wrapped neutron.api.v2.resource return f(*dup_args, **dup_kwargs) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron/api/v2/base.py", line 369, in index neutron.api.v2.resource return self._items(request, True, parent_id) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron/api/v2/base.py", line 304, in _items neutron.api.v2.resource obj_list = obj_getter(request.context, **kwargs) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/api.py", line 233, in wrapped neutron.api.v2.resource return method(*args, **kwargs) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/api.py", line 139, in wrapped neutron.api.v2.resource setattr(e, '_RETRY_EXCEEDED', True) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__ neutron.api.v2.resource self.force_reraise() neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise neutron.api.v2.resource raise value neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/api.py", line 135, in wrapped neutron.api.v2.resource return f(*args, **kwargs) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_db/api.py", line 154, in wrapper neutron.api.v2.resource ectxt.value = e.inner_exc neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__ neutron.api.v2.resource self.force_reraise() neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise neutron.api.v2.resource raise value neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_db/api.py", line 142, in wrapper neutron.api.v2.resource return f(*args, **kwargs) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/api.py", line 183, in wrapped neutron.api.v2.resource LOG.debug("Retry wrapper got retriable exception: %s", e) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__ neutron.api.v2.resource self.force_reraise() neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise neutron.api.v2.resource raise value neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/api.py", line 179, in wrapped neutron.api.v2.resource return f(*dup_args, **dup_kwargs) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron/db/l3_db.py", line 547, in get_routers neutron.api.v2.resource page_reverse=page_reverse) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/model_query.py", line 317, in get_collection neutron.api.v2.resource for c in query neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/model_query.py", line 317, in <listcomp> neutron.api.v2.resource for c in query neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron/db/l3_db.py", line 221, in _make_router_dict neutron.api.v2.resource resource_extend.apply_funcs(l3_apidef.ROUTERS, res, router) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron_lib/db/resource_extend.py", line 84, in apply_funcs neutron.api.v2.resource resolved_func(response, db_object) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron/db/availability_zone/router.py", line 40, in _add_az_to_response neutron.api.v2.resource l3_plugin.get_router_availability_zones(router_db)) neutron.api.v2.resource File "/usr/lib/python3.6/site-packages/neutron/services/ovn_l3/plugin.py", line 477, in get_router_availability_zones neutron.api.v2.resource lr = self._ovn.get_lrouter(router['id']) neutron.api.v2.resource AttributeError: 'NoneType' object has no attribute 'get_lrouter' neutron.api.v2.resource neutron.wsgi [req-bf2230aa-0491-4caa-b5f7-169d37009672 b8de8d37a30147fd98681c22fc515874 b5938e7ebb0645e396b19e99bb7f9868 - default default] 10.91.1.7,10.250.20.26 "GET /v2.0/routers HTTP/1.1" status: 500 len: 344 time: 0.2660162 ===================== Thanks! Tony