[Bug 1668123] Re: lxc fails to start with cgroup error

[Brad Marshall]

I've had this occur on another system, and this time I could debug it a
little more freely.  This is an interesting output:

# dpkg --purge --simulate systemd
dpkg: dependency problems prevent removal of systemd:
 snapd depends on systemd (>= 204-5ubuntu20.20); however:
  Package systemd is to be removed.

dpkg: error processing package systemd (--purge):
 dependency problems - not removing
Errors were encountered while processing:
 systemd

Now, why snapd was installed I'm not sure, but I guess that's what
installed systemd, since the snapd package depends on systemd.

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https://bugs.launchpad.net/bugs/1668123

Title:
  lxc fails to start  with cgroup error

Status in systemd package in Ubuntu:
  New

Bug description:
  After rebooting a KVM instance hosting LXCs, we get the following
  error:

    $ sudo lxc-ls --fancy
    lxc: cgmanager.c: lxc_cgmanager_escape: 331 call to cgmanager_move_pid_abs_sync(name=dsystemd)  failed: invalid request

  and the LXCs won't start up. In the error logs it showed:

    lxc-start 1487906073.534 ERROR    lxc_cgfs -
  cgfs.c:lxc_cgroupfs_create:873 - Could not find writable mount point
  for cgroup hierarchy 11 while trying to create cgroup.

  The only way I could get the lxcs started was to stop and start
  cgmanager, just a simple restart wasn't sufficient.

  Please let me know if you need any further information.

  $ lsb_release -a
  Description:	Ubuntu 14.04.5 LTS
  Release:	14.04

  $ dpkg-query -W systemd
  systemd	204-5ubuntu20.24

  $ dpkg-query -W cgmanager
  cgmanager	0.24-0ubuntu7.5

  $ dpkg-query -W lxc
  lxc	1.0.9-0ubuntu2

  $ uname -a
  Linux infra 3.13.0-110-generic #157-Ubuntu SMP Mon Feb 20 11:54:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

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