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报错如下：
Apr  3 03:52:48 neutron neutron-linuxbridge-agent: elif tornado and tornado.gen.is_coroutine_function(f):
Apr  3 03:52:48 neutron neutron-linuxbridge-agent: AttributeError: 'module' object has no attribute 'is_coroutine_function'
Apr  3 03:52:48 neutron systemd: neutron-linuxbridge-agent.service: main process exited, code=exited, status=1/FAILURE
Apr  3 03:52:48 neutron systemd: Unit neutron-linuxbridge-agent.service entered failed state.
Apr  3 03:52:48 neutron systemd: neutron-linuxbridge-agent.service failed.
Apr  3 03:52:48 neutron systemd: neutron-linuxbridge-agent.service holdoff time over, scheduling restart.
Apr  3 03:52:48 neutron systemd: Starting OpenStack Neutron Linux Bridge Agent...
Apr  3 03:52:48 neutron neutron-enable-bridge-firewall.sh: net.bridge.bridge-nf-call-iptables = 1
Apr  3 03:52:48 neutron neutron-enable-bridge-firewall.sh: net.bridge.bridge-nf-call-ip6tables = 1
Apr  3 03:52:48 neutron systemd: Started OpenStack Neutron Linux Bridge Agent.
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: Traceback (most recent call last):
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: File "/usr/bin/neutron-linuxbridge-agent", line 6, in <module>
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: from neutron.cmd.eventlet.plugins.linuxbridge_neutron_agent import main
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: File "/usr/lib/python2.7/site-packages/neutron/cmd/eventlet/plugins/linuxbridge_neutron_agent.py", line 15, in <module>
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: import \
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 47, in <module>
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: from neutron.plugins.ml2.drivers.linuxbridge.agent import arp_protect
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/arp_protect.py", line 229, in <module>
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: def ebtables(comm, table='nat'):
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: File "/usr/lib/python2.7/site-packages/tenacity/init.py", line 98, in wrap
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: elif tornado and tornado.gen.is_coroutine_function(f):
Apr  3 03:52:49 neutron neutron-linuxbridge-agent: AttributeError: 'module' object has no attribute 'is_coroutine_function'
Apr  3 03:52:49 neutron systemd: neutron-linuxbridge-agent.service: main process exited, code=exited, status=1/FAILURE
Apr  3 03:52:49 neutron systemd: Unit neutron-linuxbridge-agent.service entered failed state.
Apr  3 03:52:49 neutron systemd: neutron-linuxbridge-agent.service failed.

现象是 neutron-linuxbridge-agent 不断重启，但是不生产日志文件，最后启动失败，坑了我2天，找到问题 "neutron-linuxbridge-agent: AttributeError: 'module' object has no attribute 'is_coroutine_function'"
找到/usr/lib/python2.7/site-packages/tenacity/init.py 里面找到这个代码注释掉。
如下：
以前是：
def wrap(f):
if asyncio and asyncio.iscoroutinefunction(f):
r = AsyncRetrying(*dargs, dkw)
elif tornado and tornado.gen.is_coroutine_function(f):
r = TornadoRetrying(*dargs, *dkw)
else:
r = Retrying(dargs, dkw)

       return r.wraps(f)    return wrap

改变后：
def wrap(f):
if asyncio and asyncio.iscoroutinefunction(f):
r = AsyncRetrying(*dargs, **dkw)
#elif tornado and tornado.gen.is_coroutine_function(f):

r = TornadoRetrying(*dargs, **dkw)

       else:
           r = Retrying(*dargs, **dkw)        return r.wraps(f)    return wrap

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