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

Great!

> 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.

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

Title:
  unregister_netdevice: waiting for lo to become free

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