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

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

** Changed in: nova
    Milestone: None => juno-rc1

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https://bugs.launchpad.net/bugs/1204169

Title:
  compute instance.update messages sometimes have the wrong values for
  instance state

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Compute instance.update messages that are not triggered by a state
  change (e.g. setting the host in the resource tracker) have default
  (None) values for task_state, old_vm_state and old_ task_state.

  This can make the instance state sequence look wrong to anything
  consuming the messages (e.g stacktach)

   compute.instance.update  None(None) -> Building(none)
   scheduler.run_instance.scheduled 
   compute.instance.update  building(None) ->  building(scheduling)
   compute.instance.create.start 
   compute.instance.update  building(None) ->  building(None)
   compute.instance.update  building(None) ->  building(networking)
   compute.instance.update  building(networking) -> building(block_device_mapping)

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