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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1498370

Title:
  DHCP agent: interface unplug leads to exeception

Status in neutron:
  Fix Released

Bug description:
  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

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