I just added a new artful version to the ppa, version
4.13.0-38.43+hf1711407v20180413b1; it's building right now.  It should
avoid the hang just like the last version from yesterday; but the last
one blocked freeing any future net namespaces after one hangs; this one
fixes that so even after a net namespace hangs, future ones will
correctly clean up and get freed.

I also added debug to this new build that will show each net namespace
alloc and free, like:

[  207.625857] net_namespace: alloced net ffff8d2eb3cae000
[  208.152882] net_namespace: freeing net ffff8d2eb3cae000

and it has the same dbg during reproduction of this bug, where it hangs,

[ 1363.377355] unregister_netdevice: possible namespace leak (netns 
ffff96ddf1c10000), have been waiting for 131032 seconds
[ 1363.377393]  (netns ffff96ddf1c10000): open sk ffff96ddf1e77380 family 2 
state 4 dst_cache           (null) rx_dst ffff96ddf532d800 creator 
generic_ip_connect+0x257/0x4f0 [cifs]
[ 1363.377406]  (netns ffff96ddf1c10000): dst ffff96ddf532d800 expires 0 error 
0 obsolete 2 flags 0 refcnt 1 ops ipv4_dst_ops+0x0/0xc0 creator 

If you're able to test with today's build, let me know if you are able to 
reproduce the problem (see the 'namespace leak' message) and if it has worked 
around the container hang correctly.  Thanks!

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  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:
  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.



  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 =

  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-

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