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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/1363231

Title:
  Periodic thread lockup

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  The instance locking introduced in
  cc5388bbe81aba635fb757e202d860aeed98f3e8 keeps the power state sane
  between stop and the periodic task power sync.  However, locking on
  an instance in the periodic task thread can potentially lock
  that thread for a long time.

  Example:
  1) User boots an instance.  The instance gets locked by uuid.
  2) Driver spawn begins and the image starts downloading from glance.
  3) During spawn, periodic tasks run.  Sync power states tries to grab
  the same instance lock by uuid.
  4) Periodic task thread hangs until the driver spawn completes in
  another greenthread.

  This scenario results in nova-compute appearing unresponsive for
  a long time.

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