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

 

This bug was fixed in the package linux - 3.16.0-10.15

---------------
linux (3.16.0-10.15) utopic; urgency=low

  [ dann frazier ]

  * [debian] Fix regression with ABI subversions and backport

  [ Feng Kan ]

  * SAUCE: (no-up) irqchip:gic: change access of gicc_ctrl register to read
    modify write.
    - LP: #1357527
  * SAUCE: (no-up) arm64: optimized copy_to_user and copy_from_user
    assembly code
    - LP: #1358949

  [ Stefan Bader ]

  * SAUCE: bcache: prevent crash on changing writeback_running
    - LP: #1357295

  [ Tim Gardner ]

  * [Config] CONFIG_XFRM_STATISTICS=y
  * [Config] CONFIG_SECURITY_NETWORK_XFRM=y
  * [Config] CONFIG_SENSORS_IBMPOWERNV=m
    - LP: #1353005
  * Release Tracking Bug
    - LP: #1359783

  [ Upstream Kernel Changes ]

  * intel_idle: Broadwell support
    - LP: #1256170
  * powerpc/book3s: Add basic infrastructure to handle HMI in Linux.
    - LP: #1357108
  * powerpc/powernv: Invoke opal call to handle hmi.
    - LP: #1357108
  * powerpc/book3s: handle HMIs for cpus in nap mode.
    - LP: #1357108
  * powerpc/book3s: Fix endianess issue for HMI handling on napping cpus.
    - LP: #1357108
  * powerpc: Add smp_mb() to arch_spin_is_locked()
    - LP: #1358569
  * powerpc: Add smp_mb()s to arch_spin_unlock_wait()
    - LP: #1358569
  * hwmon: (powerpc/powernv) hwmon driver for power, fan rpm, voltage and
    temperature
    - LP: #1353005
  * tools/testing/selftests/ptrace/peeksiginfo.c: add PAGE_SIZE definition
    - LP: #1358855
  * printk: Add function to return log buffer address and size
    - LP: #1359423
  * powerpc/powernv: Interface to register/unregister opal dump region
    - LP: #1359423
  * bcache: fix crash on shutdown in passthrough mode
    - LP: #1357295
  * bcache: fix uninterruptible sleep in writeback thread
    - LP: #1357295

  [ Vinayak Kale ]

  * SAUCE: (no-up) dt-bindings: Add Potenza PMU binding
    - LP: #1357527
  * SAUCE: (no-up) arm64: dts: Add PMU node for APM X-Gene Storm SOC
    - LP: #1357527
 -- Tim Gardner <tim.gardner@xxxxxxxxxxxxx>   Fri, 15 Aug 2014 12:34:33 -0600

** Changed in: linux (Ubuntu Utopic)
       Status: Fix Committed => Fix Released

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

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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References