Public bug reported:

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.

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[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]

?

** Affects: linux (Ubuntu)
     Importance: Medium
     Assignee: Dan Streetman (ddstreet)
         Status: In Progress

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

Title:
  unregister_netdevice: waiting for lo to become free

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