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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1309221

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1309221

Title:
  transparent hugepages flaky on arm64

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  linux 3.13.0-24.46

  transparent hugepages, which are configured on by default in Ubuntu,
  are flaky on arm64. The most evident system is that go processes
  reliably hang or crash. This has been observed with both building
  juju-core with gccgo, and running the resulting juju binaries.

  The root cause of this is that get_user_pages_fast is not yet
  implemented on arm64 (and arm64). Patches are floating around, but
  haven't landed.

    http://comments.gmane.org/gmane.linux.ports.arm.kernel/299268

  We've verified that either applying those patches, or disabling THP
  via sysfs, prevents the above issues.

  At minimum we should change the default boottime sysfs setting for THP
  to "never" until we can fix this feature properly.

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