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

[Seth Forshee]

Public bug reported:

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.

** Affects: systemd (Ubuntu)
     Importance: Medium
         Status: Fix Released

** Affects: systemd (Ubuntu Trusty)
     Importance: Medium
         Status: Confirmed

** Also affects: lxc
   Importance: Undecided
       Status: New

** No longer affects: lxc (Ubuntu)

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

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

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

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