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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Utopic)
   Importance: High
     Assignee: Andy Whitcroft (apw)
       Status: Fix Committed

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https://bugs.launchpad.net/bugs/1358569

Title:
  ppc64le oopses and userspace process hangs in System V semaphore code

Status in “linux” package in Ubuntu:
  Fix Committed
Status in “linux” source package in Trusty:
  In Progress
Status in “linux” source package in Utopic:
  Fix Committed

Bug description:
  Canonical have been hitting issues with the System V semaphore code.
  Sometimes userspace processes would hang, sometimes an oops would pop.

  We have been able to reproduce this. Michael Ellerman has taken a
  close look and two fixes have just been merged in the 3.17 merge
  window:

  51d7d5205d33 (powerpc: Add smp_mb() to arch_spin_is_locked())
  78e05b1421fa (powerpc: Add smp_mb()s to arch_spin_unlock_wait())

  Could these please be merged into the Utopic and (eventually) the
  Trusty kernel trees?

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