Public bug reported:
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?
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: Incomplete
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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:
Incomplete
Status in “linux” source package in Trusty:
Incomplete
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?
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1358569/+subscriptions
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