[Bug 1317179] Re: lxc containers fail to start in trusty with newer kernels

[Stéphane Graber]

Uploaded to the queue.

Testcase:
 - Install current upstream kernel on trusty (3.15)
 - Confirm that /proc/self/cgroup is incorrect for the net_cls cgroup
 - Update systemd-services
 - Reboot
 - Confirm that /proc/self/cgroup now looks identical for net_cls as for other controllers.

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https://bugs.launchpad.net/bugs/1317179

Title:
  lxc containers fail to start in trusty with newer kernels

Status in “systemd” package in Ubuntu:
  Fix Released
Status in “systemd” source package in Trusty:
  In Progress

Bug description:
  When running a trusty userspace with a newer kernel (e.g. 3.15-rc4),
  attempting to start a container fails:

  $ lxc-start -n p2
  lxc_container: call to cgmanager_create_sync failed: invalid request
  lxc_container: Failed to create net_cls:p2
  lxc_container: Error creating cgroup net_cls:p2
  lxc_container: failed creating cgroups
  lxc_container: failed to spawn 'p2'

  Iiuc, this seems to be caused new cgroups in the kernel which aren't
  enabled for systemd but that lxc tries to configure anyway.

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