yahoo-eng-team team mailing list archive

[Stephen Ma <stephen.ma@xxxxxx>]

Public bug reported:

The _rpc_loop routine takes a snapshot of the L3NATAgent’s
routers_updated set and then it clears the set.  At the same time,
L3NATAgent.routers_updated can run, it adds new routers to the
routers_updated set.  It is possible for both routines to run at the
same time.  So it is possible that _rpc_loop will clear the
routers_updated set right after routers_updated routine added a router
without having the new router included in the snapshot.  The problem
will manifests itself by having a newly associated floating ip address
not being configured in the iptables and the qg- device.

** Affects: neutron
     Importance: Undecided
     Assignee: Stephen Ma (stephen-ma)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Stephen Ma (stephen-ma)

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https://bugs.launchpad.net/bugs/1325800

Title:
  Potential Race Condition between L3NATAgent.routers_updated and
  L3NATAgent._rpc_loop.

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  The _rpc_loop routine takes a snapshot of the L3NATAgent’s
  routers_updated set and then it clears the set.  At the same time,
  L3NATAgent.routers_updated can run, it adds new routers to the
  routers_updated set.  It is possible for both routines to run at the
  same time.  So it is possible that _rpc_loop will clear the
  routers_updated set right after routers_updated routine added a router
  without having the new router included in the snapshot.  The problem
  will manifests itself by having a newly associated floating ip address
  not being configured in the iptables and the qg- device.

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