File "/usr/lib/python2.7/site-packages/ryu/lib/hub.py", line 54, in _launch
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ovs_ryuapp.py", line 37, in agent_main_wrapper
    ovs_agent.main(bridge_classes)
  File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 2175, in main
    agent.daemon_loop()
  File "/usr/lib/python2.7/site-packages/osprofiler/profiler.py", line 154, in wrapper
    return f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 2094, in daemon_loop
    self.ovsdb_monitor_respawn_interval) as pm:
  File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__
    return self.gen.next()
  File "/usr/lib/python2.7/site-packages/neutron/agent/linux/polling.py", line 35, in get_polling_manager
    pm.start()
  File "/usr/lib/python2.7/site-packages/neutron/agent/linux/polling.py", line 57, in start
    self._monitor.start(block=True)
  File "/usr/lib/python2.7/site-packages/neutron/agent/linux/ovsdb_monitor.py", line 117, in start
    while not self.is_active():
  File "/usr/lib/python2.7/site-packages/neutron/agent/linux/async_process.py", line 100, in is_active
    self.pid, self.cmd_without_namespace)
  File "/usr/lib/python2.7/site-packages/neutron/agent/linux/async_process.py", line 159, in pid
    run_as_root=self.run_as_root)
  File "/usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py", line 234, in get_root_helper_child_pid
    pid = find_child_pids(pid)[0]
  File "/usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py", line 172, in find_child_pids
    no_children_found = 'Exit code: 1' in str(e)
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