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[Matt Riedemann <mriedem@xxxxxxxxxx>]

** Also affects: nova/mitaka
   Importance: Undecided
       Status: New

** Changed in: nova/mitaka
       Status: New => In Progress

** Changed in: nova/mitaka
     Assignee: (unassigned) => Lee Yarwood (lyarwood)

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https://bugs.launchpad.net/bugs/1276214

Title:
  Live migration failure in API doesn't revert task_state to None

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) mitaka series:
  In Progress

Bug description:
  If API times out on a RPC during the processing of a migrate_server it
  does not revert the task_state back to NULL before or after sending
  the error response back to the user. This can prevent further API
  operations on the VM and leave a good VMs in non-operable state with
  the exception of perhaps a delete.

  This is one possible reproducer. I'm not sure if this is always true,
  and I'd appreciate if someone else confirm it.

  1. Somehow make RPC requests hang
  2. Issue a live migration request
  3. The call should return an HTTP error (409 perhaps)
  4. Check VM. It should be in a good state but the task_state stuck in 'migrating'

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