Comment 0 for bug 1498370

2015-09-22 01:23:42.612 ERROR neutron.agent.dhcp.agent [-] Unable to disable dhcp for c543db4d-e077-488f-b58c-5805f63f86b6.
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent Traceback (most recent call last):
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent File "/opt/stack/neutron/neutron/agent/dhcp/agent.py", line 115, in call_driver
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent getattr(driver, action)(**action_kwargs)
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 221, in disable
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent self._destroy_namespace_and_port()
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 226, in _destroy_namespace_and_port
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent self.device_manager.destroy(self.network, self.interface_name)
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 1223, in destroy
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent self.driver.unplug(device_name, namespace=network.namespace)
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent File "/opt/stack/neutron/neutron/agent/linux/interface.py", line 358, in unplug
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent tap_name = self._get_tap_name(device_name, prefix)
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent File "/opt/stack/neutron/neutron/agent/linux/interface.py", line 299, in _get_tap_name
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent dev_name = dev_name.replace(prefix or self.DEV_NAME_PREFIX,
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent AttributeError: 'NoneType' object has no attribute 'replace'
2015-09-22 01:23:42.612 TRACE neutron.agent.dhcp.agent
2015-09-22 01:23:42.616 INFO neutron.agent.dhcp.agent [-] Synchronizing state complete

The reason is the device is None