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[Launchpad Bug Tracker <1218415@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux-grouper - 3.1.10-6.24

---------------
linux-grouper (3.1.10-6.24) saucy; urgency=low

  [ Upstream Kernel Changes ]

  * prctl: add PR_{SET,GET}_CHILD_SUBREAPER to allow simple process
    supervision
    - LP: #1218415
 -- Tim Gardner <tim.gardner@xxxxxxxxxxxxx>   Thu, 29 Aug 2013 09:50:08 -0600

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

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https://bugs.launchpad.net/bugs/1218415

Title:
  upstart needs subreaper prctl support for touch kernels < v3.4

Status in “linux-grouper” package in Ubuntu:
  Fix Released
Status in “linux-maguro” package in Ubuntu:
  Fix Committed

Bug description:
  Upstart now manages the Touch session via an Upstart Session Init. To
  allow that sub-init running as a non-priv user to receive all
  SIGCHLD's for processes it starts, it attempts to use
  PR_SET_CHILD_SUBREAPER. However, that prctl was added in kernel 3.4
  and the kernel on my Nexus 7 is 3.1.10-6-grouper so does not have
  subreaper support:

  $ sudo grep subreaper /var/log/upstart/ubuntu-touch-session-phablet.log
  init: Unable to register as subreaper: Invalid argument

  As such, please cherry-pick the following to all Touch kernels older
  than 3.4 (maguro and grouper):

  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ebec18a6d3aa1e7d84aab16225e87fd25170ec2b

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