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[Bug 1942458] [NEW] NeutronNetworks.create_and_delete_subnets fails NotFound

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Public bug reported:

Rally test NeutronNetworks.create_and_delete_subnets fails on 7th
iteration.

-----------------------------------------------------------------------------------------------
Traceback (most recent call last):
  File "/snap/fcbtest/14/lib/python3.6/site-packages/rally/task/runner.py", line 69, in _run_scenario_once
    getattr(scenario_inst, method_name)(**scenario_kwargs)
  File "/snap/fcbtest/14/lib/python3.6/site-packages/rally_openstack/task/scenarios/neutron/network.py", line 233, in run
    subnet_cidr_start, subnets_per_network)
  File "/snap/fcbtest/14/lib/python3.6/site-packages/rally_openstack/task/scenarios/neutron/utils.py", line 312, in _create_subnets
    for i in range(subnets_per_network)]
  File "/snap/fcbtest/14/lib/python3.6/site-packages/rally_openstack/task/scenarios/neutron/utils.py", line 312, in <listcomp>
    for i in range(subnets_per_network)]
  File "/snap/fcbtest/14/lib/python3.6/site-packages/rally_openstack/task/scenarios/neutron/utils.py", line 146, in _create_subnet
    return {"subnet": self.neutron.create_subnet(**subnet_create_args)}
  File "/snap/fcbtest/14/lib/python3.6/site-packages/rally/task/service.py", line 114, in wrapper
    return func(instance, *args, **kwargs)
  File "/snap/fcbtest/14/lib/python3.6/site-packages/rally/task/atomic.py", line 91, in func_atomic_actions
    f = func(self, *args, **kwargs)
  File "/snap/fcbtest/14/lib/python3.6/site-packages/rally_openstack/common/services/network/neutron.py", line 489, in create_subnet
    subnet = self.client.create_subnet({"subnet": body})["subnet"]
  File "/snap/fcbtest/14/lib/python3.6/site-packages/neutronclient/v2_0/client.py", line 873, in create_subnet
    return self.post(self.subnets_path, body=body)
  File "/snap/fcbtest/14/lib/python3.6/site-packages/neutronclient/v2_0/client.py", line 359, in post
    headers=headers, params=params)
  File "/snap/fcbtest/14/lib/python3.6/site-packages/neutronclient/v2_0/client.py", line 294, in do_request
    self._handle_fault_response(status_code, replybody, resp)
  File "/snap/fcbtest/14/lib/python3.6/site-packages/neutronclient/v2_0/client.py", line 269, in _handle_fault_response
    exception_handler_v20(status_code, error_body)
  File "/snap/fcbtest/14/lib/python3.6/site-packages/neutronclient/v2_0/client.py", line 93, in exception_handler_v20
    request_ids=request_ids)
neutronclient.common.exceptions.NotFound: Subnet c48d9cfd-edec-4691-a1e2-b0f169cfbde5 could not be found.
Neutron server returns request_ids: ['req-96c99100-069f-40c2-aa2e-e4bc5b860bae']
-----------------------------------------------------------------------------------------------

neutron-server.service keeps failing and restarting:

-----------------------------------------------------------------------------------------------

Sep  1 14:06:06 juju-74c5d5-1-lxd-6 neutron-server[8435]:   return pkg_resources.EntryPoint.parse("x=" + s).load(False)
Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Main process exited, code=exited, status=1/FAILURE
Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Failed with result 'exit-code'.
Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Service hold-off time over, scheduling restart.
Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Scheduled restart job, restart counter is at 6.
Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: Stopped OpenStack Neutron Server.
Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Failed to reset devices.list: Operation not permitted
Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: Started OpenStack Neutron Server.
Sep  1 14:06:10 juju-74c5d5-1-lxd-6 neutron-server[8598]: /usr/lib/python3/dist-packages/paste/deploy/loadwsgi.py:22: PkgResourcesDeprecationWarning: Parameters to load are deprecated.  Call .resolve and .require separately.
Sep  1 14:06:10 juju-74c5d5-1-lxd-6 neutron-server[8598]:   return pkg_resources.EntryPoint.parse("x=" + s).load(False)
Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Main process exited, code=exited, status=1/FAILURE
Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Failed with result 'exit-code'.
Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Service hold-off time over, scheduling restart.
Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Scheduled restart job, restart counter is at 7.
Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: Stopped OpenStack Neutron Server.
Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Failed to reset devices.list: Operation not permitted
Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: Started OpenStack Neutron Server.
Sep  1 14:06:15 juju-74c5d5-1-lxd-6 neutron-server[8695]: /usr/lib/python3/dist-packages/paste/deploy/loadwsgi.py:22: PkgResourcesDeprecationWarning: Parameters to load are deprecated.  Call .resolve and .require separately.

-----------------------------------------------------------------------------------------------

logs:
https://oil-jenkins.canonical.com/artifacts/09956e7b-46e6-48c9-9631-dd0b84c4a808/generated/generated/openstack/rally/auto_generated.html

https://oil-
jenkins.canonical.com/artifacts/09956e7b-46e6-48c9-9631-dd0b84c4a808/generated/generated/openstack/juju-
crashdump-openstack-2021-09-01-16.40.40.tar.gz

** Affects: neutron
     Importance: Undecided
         Status: New

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Engineering Team, which is subscribed to neutron.
https://bugs.launchpad.net/bugs/1942458

Title:
  NeutronNetworks.create_and_delete_subnets fails NotFound

Status in neutron:
  New

Bug description:
  Rally test NeutronNetworks.create_and_delete_subnets fails on 7th
  iteration.

  -----------------------------------------------------------------------------------------------
  Traceback (most recent call last):
    File "/snap/fcbtest/14/lib/python3.6/site-packages/rally/task/runner.py", line 69, in _run_scenario_once
      getattr(scenario_inst, method_name)(**scenario_kwargs)
    File "/snap/fcbtest/14/lib/python3.6/site-packages/rally_openstack/task/scenarios/neutron/network.py", line 233, in run
      subnet_cidr_start, subnets_per_network)
    File "/snap/fcbtest/14/lib/python3.6/site-packages/rally_openstack/task/scenarios/neutron/utils.py", line 312, in _create_subnets
      for i in range(subnets_per_network)]
    File "/snap/fcbtest/14/lib/python3.6/site-packages/rally_openstack/task/scenarios/neutron/utils.py", line 312, in <listcomp>
      for i in range(subnets_per_network)]
    File "/snap/fcbtest/14/lib/python3.6/site-packages/rally_openstack/task/scenarios/neutron/utils.py", line 146, in _create_subnet
      return {"subnet": self.neutron.create_subnet(**subnet_create_args)}
    File "/snap/fcbtest/14/lib/python3.6/site-packages/rally/task/service.py", line 114, in wrapper
      return func(instance, *args, **kwargs)
    File "/snap/fcbtest/14/lib/python3.6/site-packages/rally/task/atomic.py", line 91, in func_atomic_actions
      f = func(self, *args, **kwargs)
    File "/snap/fcbtest/14/lib/python3.6/site-packages/rally_openstack/common/services/network/neutron.py", line 489, in create_subnet
      subnet = self.client.create_subnet({"subnet": body})["subnet"]
    File "/snap/fcbtest/14/lib/python3.6/site-packages/neutronclient/v2_0/client.py", line 873, in create_subnet
      return self.post(self.subnets_path, body=body)
    File "/snap/fcbtest/14/lib/python3.6/site-packages/neutronclient/v2_0/client.py", line 359, in post
      headers=headers, params=params)
    File "/snap/fcbtest/14/lib/python3.6/site-packages/neutronclient/v2_0/client.py", line 294, in do_request
      self._handle_fault_response(status_code, replybody, resp)
    File "/snap/fcbtest/14/lib/python3.6/site-packages/neutronclient/v2_0/client.py", line 269, in _handle_fault_response
      exception_handler_v20(status_code, error_body)
    File "/snap/fcbtest/14/lib/python3.6/site-packages/neutronclient/v2_0/client.py", line 93, in exception_handler_v20
      request_ids=request_ids)
  neutronclient.common.exceptions.NotFound: Subnet c48d9cfd-edec-4691-a1e2-b0f169cfbde5 could not be found.
  Neutron server returns request_ids: ['req-96c99100-069f-40c2-aa2e-e4bc5b860bae']
  -----------------------------------------------------------------------------------------------

  neutron-server.service keeps failing and restarting:

  -----------------------------------------------------------------------------------------------

  Sep  1 14:06:06 juju-74c5d5-1-lxd-6 neutron-server[8435]:   return pkg_resources.EntryPoint.parse("x=" + s).load(False)
  Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Main process exited, code=exited, status=1/FAILURE
  Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Failed with result 'exit-code'.
  Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Service hold-off time over, scheduling restart.
  Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Scheduled restart job, restart counter is at 6.
  Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: Stopped OpenStack Neutron Server.
  Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Failed to reset devices.list: Operation not permitted
  Sep  1 14:06:07 juju-74c5d5-1-lxd-6 systemd[1]: Started OpenStack Neutron Server.
  Sep  1 14:06:10 juju-74c5d5-1-lxd-6 neutron-server[8598]: /usr/lib/python3/dist-packages/paste/deploy/loadwsgi.py:22: PkgResourcesDeprecationWarning: Parameters to load are deprecated.  Call .resolve and .require separately.
  Sep  1 14:06:10 juju-74c5d5-1-lxd-6 neutron-server[8598]:   return pkg_resources.EntryPoint.parse("x=" + s).load(False)
  Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Main process exited, code=exited, status=1/FAILURE
  Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Failed with result 'exit-code'.
  Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Service hold-off time over, scheduling restart.
  Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Scheduled restart job, restart counter is at 7.
  Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: Stopped OpenStack Neutron Server.
  Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: neutron-server.service: Failed to reset devices.list: Operation not permitted
  Sep  1 14:06:11 juju-74c5d5-1-lxd-6 systemd[1]: Started OpenStack Neutron Server.
  Sep  1 14:06:15 juju-74c5d5-1-lxd-6 neutron-server[8695]: /usr/lib/python3/dist-packages/paste/deploy/loadwsgi.py:22: PkgResourcesDeprecationWarning: Parameters to load are deprecated.  Call .resolve and .require separately.

  -----------------------------------------------------------------------------------------------

  logs:
  https://oil-jenkins.canonical.com/artifacts/09956e7b-46e6-48c9-9631-dd0b84c4a808/generated/generated/openstack/rally/auto_generated.html

  https://oil-
  jenkins.canonical.com/artifacts/09956e7b-46e6-48c9-9631-dd0b84c4a808/generated/generated/openstack/juju-
  crashdump-openstack-2021-09-01-16.40.40.tar.gz

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