neutron-openvswitch-agent crash error!

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Stderr: '2015-06-23T16:44:56Z|00002|reconnect|WARN|unix:/var/run/openvswitch/db.sock: connection attempt failed (No such file or directory)\novs-vsctl: unix:/var/run/openvswitch/db.sock: database connection failed (No such file or directory)\n'
2015-06-24 00:44:56.249 27493 DEBUG neutron.agent.linux.async_process [req-91f28d25-c441-45ed-93e5-4a155cbc0db6 None] Halting async process [['ovsdb-client', 'monitor', 'Interface', 'name,ofport', '--format=json']]. stop /usr/lib/python2.7/site-packages/neutron/agent/linux/async_process.py:88
2015-06-24 00:44:56.250 27493 CRITICAL neutron [req-91f28d25-c441-45ed-93e5-4a155cbc0db6 None] AssertionError: Trying to re-send() an already-triggered event.
2015-06-24 00:44:56.250 27493 TRACE neutron Traceback (most recent call last):
2015-06-24 00:44:56.250 27493 TRACE neutron File "/usr/bin/neutron-openvswitch-agent", line 10, in <module>
2015-06-24 00:44:56.250 27493 TRACE neutron sys.exit(main())
2015-06-24 00:44:56.250 27493 TRACE neutron File "/usr/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 1545, in main
2015-06-24 00:44:56.250 27493 TRACE neutron agent.daemon_loop()
2015-06-24 00:44:56.250 27493 TRACE neutron File "/usr/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 1472, in daemon_loop
2015-06-24 00:44:56.250 27493 TRACE neutron self.rpc_loop(polling_manager=pm)
2015-06-24 00:44:56.250 27493 TRACE neutron File "/usr/lib64/python2.7/contextlib.py", line 35, in __exit__
2015-06-24 00:44:56.250 27493 TRACE neutron self.gen.throw(type, value, traceback)
2015-06-24 00:44:56.250 27493 TRACE neutron File "/usr/lib/python2.7/site-packages/neutron/agent/linux/polling.py", line 39, in get_polling_manager
2015-06-24 00:44:56.250 27493 TRACE neutron pm.stop()
2015-06-24 00:44:56.250 27493 TRACE neutron File "/usr/lib/python2.7/site-packages/neutron/agent/linux/polling.py", line 106, in stop
2015-06-24 00:44:56.250 27493 TRACE neutron self._monitor.stop()
2015-06-24 00:44:56.250 27493 TRACE neutron File "/usr/lib/python2.7/site-packages/neutron/agent/linux/async_process.py", line 89, in stop
2015-06-24 00:44:56.250 27493 TRACE neutron self._kill()
2015-06-24 00:44:56.250 27493 TRACE neutron File "/usr/lib/python2.7/site-packages/neutron/agent/linux/ovsdb_monitor.py", line 99, in _kill
2015-06-24 00:44:56.250 27493 TRACE neutron super(SimpleInterfaceMonitor, self)._kill(*args, **kwargs)
2015-06-24 00:44:56.250 27493 TRACE neutron File "/usr/lib/python2.7/site-packages/neutron/agent/linux/async_process.py", line 116, in _kill
2015-06-24 00:44:56.250 27493 TRACE neutron self._kill_event.send()
2015-06-24 00:44:56.250 27493 TRACE neutron File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 155, in send
2015-06-24 00:44:56.250 27493 TRACE neutron assert self._result is NOT_USED, 'Trying to re-send() an already-triggered event.'
2015-06-24 00:44:56.250 27493 TRACE neutron AssertionError: Trying to re-send() an already-triggered event.

2015-06-24 00:44:56.250 27493 TRACE neutron

2015-06-24 08:59:19.716 17736 INFO neutron.common.config [-] Logging enabled!

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