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[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

** Changed in: mir (Ubuntu)
   Importance: Undecided => High

** Changed in: mir (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1427976

Title:
  SessionMediator locks mutexes in one thread and unlocks them in
  another

Status in Mir:
  Fix Committed
Status in mir package in Ubuntu:
  Triaged

Bug description:
  SessionMediator locks mutexes in one thread and unlocks them in
  another thread during create_surface or exchange_buffer. This can
  cause undefined behavior:

  http://www.cplusplus.com/reference/mutex/mutex/unlock/

  "If the mutex is not currently locked by the calling thread, it causes
  undefined behavior."

  This may potentially be the root cause of  a hang (wait handle never
  signals) seen when creating/destroying menu surfaces while a parent
  does swap_buffers.

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