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[Carl Baldwin <carl.baldwin@xxxxxx>]

*** This bug is a duplicate of bug 1315467 ***
    https://bugs.launchpad.net/bugs/1315467

** This bug is no longer a duplicate of bug 1325800
   Potential Race Condition between L3NATAgent.routers_updated and L3NATAgent._rpc_loop.
** This bug has been marked a duplicate of bug 1315467
   Neutron deletes the router interface instead of adding a floatingip

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https://bugs.launchpad.net/bugs/1330993

Title:
  L3-Agent does not process some router update messages due to missing
  thread synchronization

Status in OpenStack Neutron (virtual network service):
  Incomplete

Bug description:
  The L3-Agent  does not process some router update messages due to the
  updates being overwritten due to missing thread synchronization. This
  happens when a lot of FloatingIP and Router APIs are invoked.

  The functions _rpc_loop and _sync_routers_task are annotated with
  @lockutils.synchronized('l3-agent', 'neutron-'). This provides
  concurrent access to the global variables updated_routers and
  removed_routers.

  However the same variables would be updated by the RPC methods such as
  routers_updated, router_deleted etc.

  As a temporary fix these methods could also be made synchronized, but
  investigation is needed about a minor redesign to avoid using the
  global variables to keep track of any updates.

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