[Bug 1020285] Re: Addition of leap second causes spuriously high CPU usage and futex lockups

[Launchpad Bug Tracker]

This bug was fixed in the package base-files - 6.5ubuntu8

---------------
base-files (6.5ubuntu8) quantal; urgency=low

  * Call date -s $(date -R) on upgrade, to resync any clocks that might
    be desynced (and causing pthread spinning in the kernel) due to the leap
    second.  LP: #1020285.
 -- Steve Langasek <steve.langasek at ubuntu.com>   Tue, 03 Jul 2012 10:43:12 -0700

** Changed in: base-files (Ubuntu Quantal)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1020285

Title:
  Addition of leap second causes spuriously high CPU usage and futex
  lockups

Status in “base-files” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  In Progress
Status in “base-files” source package in Lucid:
  New
Status in “linux” source package in Lucid:
  Triaged
Status in “base-files” source package in Natty:
  New
Status in “linux” source package in Natty:
  Triaged
Status in “base-files” source package in Oneiric:
  New
Status in “linux” source package in Oneiric:
  Triaged
Status in “base-files” source package in Precise:
  New
Status in “linux” source package in Precise:
  Triaged
Status in “base-files” source package in Quantal:
  Fix Released
Status in “linux” source package in Quantal:
  In Progress

Bug description:
  As widely reported, the addition of the leap second on 2012-06-30 has
  caused high CPU usage and futex lockups in a lot of applications
  including JVMs, Mysql as well as desktop apps like Firefox and
  Thunderbird.

  https://lkml.org/lkml/2012/6/30/122
  http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates-of-linux-server-crashes-during-a-leap-second
  https://blog.mozilla.org/it/2012/06/30/mysql-and-the-leap-second-high-cpu-and-the-fix/

  We've seen this ourselves on the Canonical infrastructure on both
  current Lucid and Precise kernels, i.e.

  ii  linux-image-2.6.32-41-server         2.6.32-41.90                         Linux kernel image for version 2.6.32 on x86_64
  ii  linux-image-3.2.0-24-generic         3.2.0-24.39                          Linux kernel image for version 3.2.0 on 64 bit x86 SMP

  We can also confirm the 'date -s $(date)' workaround fixes the problem
  without requiring a reboot.

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