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[Slawek Kaplonski <1928764@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1928764

Title:
  Fullstack test TestUninterruptedConnectivityOnL2AgentRestart failing
  often with LB agent

Status in neutron:
  Fix Released

Bug description:
  It seems that test
  neutron.tests.fullstack.test_connectivity.TestUninterruptedConnectivityOnL2AgentRestart.test_l2_agent_restart
  in various LB scenarios (flat, vxlan network) are failing recently
  pretty often.

  Examples of failures:

  https://09f8e4e92bfb8d2ac89d-b41143eab52d80358d8555f964e9341b.ssl.cf5.rackcdn.com/670611/13/check/neutron-fullstack-with-uwsgi/8f51833/testr_results.html
  https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_400/790288/1/check/neutron-fullstack-with-uwsgi/40025f9/testr_results.html
  https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_400/790288/1/check/neutron-fullstack-with-uwsgi/40025f9/testr_results.html
  https://0603beb4ddbd36de1165-42644bdefd5590a8f7e4e2e8a8a4112f.ssl.cf5.rackcdn.com/787956/1/check/neutron-fullstack-with-uwsgi/7640987/testr_results.html
  https://e978bdcfc0235dcd9417-6560bc3b6382c1d289b358872777ca09.ssl.cf1.rackcdn.com/787956/1/check/neutron-fullstack-with-uwsgi/779913e/testr_results.html
  https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_0cb/789648/5/check/neutron-fullstack-with-uwsgi/0cb6d65/testr_results.html

  Stacktrace:

  ft1.1: neutron.tests.fullstack.test_connectivity.TestUninterruptedConnectivityOnL2AgentRestart.test_l2_agent_restart(LB,Flat network)testtools.testresult.real._StringException: Traceback (most recent call last):
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/base.py", line 183, in func
      return f(self, *args, **kwargs)
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_connectivity.py", line 236, in test_l2_agent_restart
      self._assert_ping_during_agents_restart(
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/base.py", line 123, in _assert_ping_during_agents_restart
      common_utils.wait_until_true(
    File "/usr/lib/python3.8/contextlib.py", line 120, in __exit__
      next(self.gen)
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/common/net_helpers.py", line 147, in async_ping
      f.result()
    File "/usr/lib/python3.8/concurrent/futures/_base.py", line 432, in result
      return self.__get_result()
    File "/usr/lib/python3.8/concurrent/futures/_base.py", line 388, in __get_result
      raise self._exception
    File "/usr/lib/python3.8/concurrent/futures/thread.py", line 57, in run
      result = self.fn(*self.args, **self.kwargs)
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/common/net_helpers.py", line 128, in assert_async_ping
      ns_ip_wrapper.netns.execute(
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/agent/linux/ip_lib.py", line 718, in execute
      return utils.execute(cmd, check_exit_code=check_exit_code,
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/agent/linux/utils.py", line 156, in execute
      raise exceptions.ProcessExecutionError(msg,
  neutron_lib.exceptions.ProcessExecutionError: Exit code: 1; Cmd: ['ip', 'netns', 'exec', 'test-af70cf3a-c531-4fdf-ab4c-31cc69cc2c56', 'ping', '-W', 2, '-c', '1', '20.0.0.212']; Stdin: ; Stdout: PING 20.0.0.212 (20.0.0.212) 56(84) bytes of data.

  --- 20.0.0.212 ping statistics ---
  1 packets transmitted, 0 received, 100% packet loss, time 0ms

  ; Stderr:


  I checked linuxbridge-agent logs (2 cases) and I found there error
  like below:

  2021-05-13 15:46:07.721 96421 DEBUG oslo.privsep.daemon [-] privsep: reply[139960964907248]: (4, ()) _call_back /home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_privsep/daemon.py:510
  2021-05-13 15:46:07.725 96421 DEBUG oslo.privsep.daemon [-] privsep: reply[139960964907248]: (4, None) _call_back /home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_privsep/daemon.py:510
  2021-05-13 15:46:07.728 96421 DEBUG oslo.privsep.daemon [-] privsep: Exception during request[139960964907248]: Network interface brqa235fa8c-09 not found in namespace None. _process_cmd /home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_privsep/daemon.py:488
  Traceback (most recent call last):
    File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_privsep/daemon.py", line 485, in _process_cmd
      ret = func(*f_args, **f_kwargs)
    File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_privsep/priv_context.py", line 249, in _wrap
      return func(*args, **kwargs)
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/privileged/agent/linux/ip_lib.py", line 278, in delete_ip_address
      _run_iproute_addr("delete",
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/privileged/agent/linux/ip_lib.py", line 239, in _run_iproute_addr
      idx = get_link_id(device, namespace)
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/privileged/agent/linux/ip_lib.py", line 201, in get_link_id
      raise NetworkInterfaceNotFound(device=device, namespace=namespace)
  neutron.privileged.agent.linux.ip_lib.NetworkInterfaceNotFound: Network interface brqa235fa8c-09 not found in namespace None.
  2021-05-13 15:46:07.730 96421 DEBUG oslo.privsep.daemon [-] privsep: reply[139960964907248]: (5, 'neutron.privileged.agent.linux.ip_lib.NetworkInterfaceNotFound', ('Network interface brqa235fa8c-09 not found in namespace None.',)) _call_back /home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_privsep/daemon.py:510
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server [req-6e40de24-c317-438b-914e-65ea4acea314 - - - - -] Exception during message handling: neutron.privileged.agent.linux.ip_lib.NetworkInterfaceNotFound: Network interface brqa235fa8c-09 not found in namespace None.
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_messaging/rpc/dispatcher.py", line 309, in dispatch
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_messaging/rpc/dispatcher.py", line 229, in _do_dispatch
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 887, in network_delete
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     self.agent.mgr.delete_bridge(bridge_name)
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 600, in delete_bridge
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     updated = self.update_interface_ip_details(interface,
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 418, in update_interface_ip_details
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     self._update_interface_ip_details(destination, source, ips,
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 410, in _update_interface_ip_details
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     src_device.addr.delete(cidr=ip['cidr'])
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/neutron/agent/linux/ip_lib.py", line 517, in delete
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     delete_ip_address(cidr, self.name, self._parent.namespace)
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/neutron/agent/linux/ip_lib.py", line 811, in delete_ip_address
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     privileged.delete_ip_address(
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_privsep/priv_context.py", line 247, in _wrap
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     return self.channel.remote_call(name, args, kwargs)
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server   File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.8/site-packages/oslo_privsep/daemon.py", line 224, in remote_call
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server     raise exc_type(*result[2])
  2021-05-13 15:46:07.730 96075 ERROR oslo_messaging.rpc.server neutron.privileged.agent.linux.ip_lib.NetworkInterfaceNotFound: Network interface brqa235fa8c-09 not found in namespace None.

  
  This may be related to the issue or may be red herring. I don't really know for now.

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