kernel-packages team mailing list archive

[Adam Conrad <adconrad@xxxxxxx>]

Looks like we also want these commits to fully support backporting this
to trusty and pick up all the spinlock fixes in one go:

919fc6e34831d1c2b58bfb5ae261dc3facc9b269
3405d230b374b6923878b21b8d708d7db1f734ef
7179ba52889bef7e5e23f72908270e1ab2b7fc6f

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

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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