> The machine continue to run and the docker is still able to create new 
> instances,
> i.e. there is no complete lock out.


> The machine continued to run further, and after an ~hour , 3 namespaces 
> leaked.
> The machine now has load "3", which seems to be an artifact of this. Other 
> than that,
> it seems to continue to run!

Hmm, can you check 'top' or 'htop' or similar to see if the kworker
thread(s) are actually using cpu time?  They should be sleeping almost
all the time, not spinning on anything.

I'll work on getting that patch upstream (but likely not nearly as
verbose, probably just a single WARNING for leaked namespace).

After that, I'll keep working on adding dst leak debugging to actually
try to find where your dst leak is coming from.

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  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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