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[Launchpad Bug Tracker <1668724@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cgroup-lite - 1.13

---------------
cgroup-lite (1.13) zesty; urgency=medium

  * Handle mounting comounted cgroup controllers  (LP: #1668724)

 -- Cameron Cope <cam@xxxxxxxxxxx>  Tue, 28 Feb 2017 11:48:05 -0800

** Changed in: cgroup-lite (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1668724

Title:
  fails to mount cgroupfs inside containers running on 16.04

Status in cgroup-lite package in Ubuntu:
  Fix Released
Status in cgroup-lite source package in Precise:
  New
Status in cgroup-lite source package in Trusty:
  New
Status in cgroup-lite source package in Xenial:
  New
Status in cgroup-lite source package in Yakkety:
  New

Bug description:
  I need to run nested Ubuntu 12.04 and 14.04 containers on 16.04 hosts,
  and have noticed that the cgroups-mount script for mounting the
  cgroups inside the containers has stopped working. This is because
  systemd now comounts multiple controllers on a single hierarchy, which
  prevents mounting them individually inside the container.

  ===========  SRU Justification ================
  Impact: nested containers fail to start
  Reproduce:  create a root owned container;  install lxc and cgroup-lite;  create a container, and try to start it.  Starting will fail if cgroup-lite is running in the first level container without this patch.
  Regression potential:  should be low, it's possible that the regexp is simply wrong for some cases.
  ===============================================

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