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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 1398596

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/1398596

Title:
  [Revert] arm64: optimized copy_to_user and copy_from_user assembly
  code

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]
  Fixes an issue where the kernel hits unhandled pagefaults when copy_to_user is called.

  http://www.spinics.net/lists/arm-kernel/msg381811.html

  [Test Case]
  Put the system under memory pressure.

  [Regression Potential]
  It will cause a performance regression on certain workloads on arm64 systems.

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