Hi Dan,

here is the output:

Feb  2 18:50:14 prg41-004 kernel: [  482.151773] unregister_netdevice: waiting 
for lo (netns ffff8de11803e000) to become free. Usage count = 1
Feb  2 18:50:14 prg41-004 kernel: [  482.151876]        (netns 
ffff8de11803e000): dst ffff8dd905360300 expires 0 error 0 obsolete 2 refcnt 1 
ops ipv4_dst_ops+0x0/0xc0 creator rt_dst_alloc+0x54/0xe0

It keeps to be output every 10s for over 500s now.

I hope it helps.

Jirka Horky

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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:
  In Progress
Status in linux source package in Artful:
  In Progress
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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