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[Dave Walker <email@xxxxxxxxxx>]

** Also affects: neutron/kilo
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1533441

Title:
  HA router can not be deleted in L3 agent after race between HA router
  creating and deleting

Status in neutron:
  Fix Released
Status in neutron kilo series:
  New

Bug description:
  HA router can not be deleted in L3 agent after race between HA router
  creating and deleting

  Exception:
  1. Unable to process HA router %s without HA port (HA router initialize)

  2. AttributeError: 'NoneType' object has no attribute 'config' (HA
  router deleting procedure)

  
  With the newest neutron code, I find a infinite loop in _safe_router_removed.
  Consider a HA router without HA port was placed in the l3 agent,
  usually because of the race condition.

  Infinite loop steps:
  1. a HA router deleting RPC comes
  2. l3 agent remove it
  3. the RouterInfo will delete its the router namespace(self.router_namespace.delete())
  4. the HaRouter, ha_router.delete(), where the AttributeError: 'NoneType' or some error will be raised.
  5. _safe_router_removed return False
  6. self._resync_router(update)
  7. the router namespace is not existed, RuntimeError raised, go to 5, infinite loop 5 - 7

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