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[Armando Migliaccio <1350903@xxxxxxxxxxxxxxxxxx>]

This is an automated cleanup. This bug report has been closed because it
is older than 18 months and there is no open code change to fix this.
After this time it is unlikely that the circumstances which lead to
the observed issue can be reproduced.

If you can reproduce the bug, please:
* reopen the bug report (set to status "New")
* AND add the detailed steps to reproduce the issue (if applicable)
* AND leave a comment "CONFIRMED FOR: <RELEASE_NAME>"
  Only still supported release names are valid (INCUBATOR-JUNO, LIBERTY, MITAKA, NEWTON).
  Valid example: CONFIRMED FOR: INCUBATOR-JUNO


** Changed in: neutron
   Importance: Medium => Undecided

** Changed in: neutron
       Status: Confirmed => Expired

** Changed in: neutron
     Assignee: Zang MingJie (zealot0630) => (unassigned)

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https://bugs.launchpad.net/bugs/1350903

Title:
  Ovs agent fails to kill ovsdb monitor properly

Status in neutron:
  Expired

Bug description:
  The following log is observed in one of the deployments:

  2014-07-31 14:42:58.744 28084 DEBUG neutron.plugins.openvswitch.agent.ovs_neutron_agent [req-0698c817-970d-4c56-bd72-90fb37f1a134 None] Agent caught SIGTERM, quitting daemon loop. _handle_sigterm /usr/lib/python2.7/dist-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py:1366
  2014-07-31 14:42:58.748 28084 ERROR neutron.agent.linux.ovsdb_monitor [req-0698c817-970d-4c56-bd72-90fb37f1a134 None] Error received from ovsdb monitor: 2014-07-31T14:42:58Z|00001|fatal_signal|WARN|terminating with signal 15 (Terminated)
  2014-07-31 14:42:58.760 28084 DEBUG neutron.agent.linux.async_process [req-0698c817-970d-4c56-bd72-90fb37f1a134 None] Halting async process [['ovsdb-client', 'monitor', 'Interface', 'name,ofport', '--format=json']] in response to an error. _handle_process_error /usr/lib/python2.7/dist-packages/neutron/agent/linux/async_process.py:173
  2014-07-31 14:42:58.763 28084 DEBUG neutron.agent.linux.utils [req-0698c817-970d-4c56-bd72-90fb37f1a134 None] Running command: ['ps', '--ppid', '28160', '-o', 'pid='] create_process /usr/lib/python2.7/dist-packages/neutron/agent/linux/utils.py:48
  2014-07-31 14:42:58.880 28084 DEBUG neutron.agent.linux.utils [req-0698c817-970d-4c56-bd72-90fb37f1a134 None]
  Command: ['ps', '--ppid', '28160', '-o', 'pid=']
  Exit code: 1
  Stdout: ''
  Stderr: '' execute /usr/lib/python2.7/dist-packages/neutron/agent/linux/utils.py:74
  2014-07-31 14:43:00.040 28084 DEBUG neutron.agent.linux.async_process [req-0698c817-970d-4c56-bd72-90fb37f1a134 None] Halting async process [['ovsdb-client', 'monitor', 'Interface', 'name,ofport', '--format=json']]. stop /usr/lib/python2.7/dist-packages/neutron/agent/linux/async_process.py:90
  2014-07-31 14:43:00.052 28084 CRITICAL neutron [req-0698c817-970d-4c56-bd72-90fb37f1a134 None] AssertionError: Trying to re-send() an already-triggered event.
  2014-07-31 14:43:00.052 28084 TRACE neutron Traceback (most recent call last):
  2014-07-31 14:43:00.052 28084 TRACE neutron   File "/usr/bin/neutron-openvswitch-agent", line 10, in <module>
  2014-07-31 14:43:00.052 28084 TRACE neutron     sys.exit(main())
  2014-07-31 14:43:00.052 28084 TRACE neutron   File "/usr/lib/python2.7/dist-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 1435, in main
  2014-07-31 14:43:00.052 28084 TRACE neutron     agent.daemon_loop()
  2014-07-31 14:43:00.052 28084 TRACE neutron   File "/usr/lib/python2.7/dist-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 1363, in daemon_loop
  2014-07-31 14:43:00.052 28084 TRACE neutron     self.rpc_loop(polling_manager=pm)
  2014-07-31 14:43:00.052 28084 TRACE neutron   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
  2014-07-31 14:43:00.052 28084 TRACE neutron     self.gen.next()
  2014-07-31 14:43:00.052 28084 TRACE neutron   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/polling.py", line 41, in get_polling_manager
  2014-07-31 14:43:00.052 28084 TRACE neutron     pm.stop()
  2014-07-31 14:43:00.052 28084 TRACE neutron   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/polling.py", line 108, in stop
  2014-07-31 14:43:00.052 28084 TRACE neutron     self._monitor.stop()
  2014-07-31 14:43:00.052 28084 TRACE neutron   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/async_process.py", line 91, in stop
  2014-07-31 14:43:00.052 28084 TRACE neutron     self._kill()
  2014-07-31 14:43:00.052 28084 TRACE neutron   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/ovsdb_monitor.py", line 108, in _kill
  2014-07-31 14:43:00.052 28084 TRACE neutron     super(SimpleInterfaceMonitor, self)._kill(*args, **kwargs)
  2014-07-31 14:43:00.052 28084 TRACE neutron   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/async_process.py", line 118, in _kill
  2014-07-31 14:43:00.052 28084 TRACE neutron     self._kill_event.send()
  2014-07-31 14:43:00.052 28084 TRACE neutron   File "/usr/lib/python2.7/dist-packages/eventlet/event.py", line 150, in send
  2014-07-31 14:43:00.052 28084 TRACE neutron     assert self._result is NOT_USED, 'Trying to re-send() an already-triggered event.'
  2014-07-31 14:43:00.052 28084 TRACE neutron AssertionError: Trying to re-send() an already-triggered event.
  2014-07-31 14:43:00.052 28084 TRACE neutron

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