[Bug 1977870] Re: SRU fix for LP#1807628

[Sergio Durigan Junior]

Ah, something I didn't mention: I'm trying this using a Bionic VM.

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Title:
  SRU fix for LP#1807628

Status in lxcfs package in Ubuntu:
  New

Bug description:
  [Impact]

   * lxcfs will segfault if there are no non-directory files in a cgroup. This necessitates restarting running containers.
   * See LP#1807628 (https://bugs.launchpad.net/ubuntu/+source/lxcfs/+bug/1807628) for details on the impact.

  [Test Plan]

   * Start LXC containers and HUP the lxcfs process.

  [Where problems could occur]

   * Correcting the null pointer dereference could allow previously
  undetected bugs masked by the segfault to be encountered.

  [Other Info]
   
   * Proposed fix is upstream since version 3.0.4 with no negative impacts.
   * Proposed fix is a minimal cherry-pick of the fix, without other functional changes.

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