Maybe related to https://review.openstack.org/#/c/347708/2
looks similar with bug:
https://bugs.launchpad.net/neutron/+bug/1606827

I think Neutron team should look at it


node-2/var/log/neutron/neutron-openvswitch-agent.log

2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [-] Failed reporting state!
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Traceback (most recent call last):
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 322, in _report_state
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     True)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/rpc.py", line 86, in report_state
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     return method(context, 'report_state', **kwargs)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/common/rpc.py", line 155, in call
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     time.sleep(wait)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self.force_reraise()
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     six.reraise(self.type_, self.value, self.tb)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/common/rpc.py", line 136, in call
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     return self._original_context.call(ctxt, method, **kwargs)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/client.py", line 158, in call
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     retry=self.retry)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/transport.py", line 91, in _send
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     timeout=timeout, retry=retry)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 512, in send
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     retry=retry)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 501, in _send
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     result = self._waiter.wait(msg_id, timeout)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 379, in wait
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     message = self.waiters.get(msg_id, timeout=timeout)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 277, in get
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     'to message ID %s' % msg_id)
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent MessagingTimeout: Timed out waiting for a reply to message ID 0c5d4e5a6ec447b98c882169b7ef6aac
2016-08-08 08:16:09.394 25878 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent