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[Bug 1358569] Re: ppc64le oopses and userspace process hangs in System V semaphore code


Ok I have backported those 5 commits to trusty and built a test kernel
for testing.  The kernel is at the URL below.  Pleas report any testing
back here:


The individual patches are also split out at the above URL and I am
attaching the overall diff.

** Patch added: "COMBO.diff"

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  ppc64le oopses and userspace process hangs in System V semaphore code

Status in “linux” package in Ubuntu:
Status in “linux” source package in Trusty:

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

  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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