This bug was nominated against a series that is no longer supported, ie
artful.  The bug task representing the artful nomination is being closed
as Won't Fix.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu Artful)
       Status: In Progress => Won't Fix

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https://bugs.launchpad.net/bugs/1711407

Title:
  unregister_netdevice: waiting for lo to become free

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Won't Fix
Status in linux source package in Bionic:
  In Progress

Bug description:
  This is a "continuation" of bug 1403152, as that bug has been marked
  "fix released" and recent reports of failure may (or may not) be a new
  bug.  Any further reports of the problem should please be reported
  here instead of that bug.

  --

  [Impact]

  When shutting down and starting containers the container network
  namespace may experience a dst reference counting leak which results
  in this message repeated in the logs:

      unregister_netdevice: waiting for lo to become free. Usage count =
  1

  This can cause issues when trying to create net network namespace and
  thus block a user from creating new containers.

  [Test Case]

  See comment 16, reproducer provided at https://github.com/fho/docker-
  samba-loop

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