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[Mathew Hodson <mathew.hodson@xxxxxxxxx>]

** No longer affects: neutron (Ubuntu Trusty)

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

Title:
  [SRU] DHCP agent: interface unplug leads to exception

Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Vivid:
  Fix Released
Status in neutron source package in Wily:
  Fix Released
Status in neutron source package in Xenial:
  Fix Released

Bug description:
  [Impact]

      There are edge cases when the DHCP agent attempts to unplug an interface
      and the device does not exist. This patch ensures that the agent can
      tolerate this case.

  [Test Case]

      * create subnet with dhcp enabled
      * set pdb.set_trace() in neutron.agent.linux.dhcp.DeviceManager.destroy()
      * manually delete ns-<id> device in tenant namespace
      * pdb continue and should not raise any error

  [Regression Potential]

      None

  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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