> the CPU usage is zero, there is nothing popping up. The tasks causing the 
> high load
> value are in D state

ok that seems expected then.  This doesn't 'fix' the problem of the
leaked dst (and namespace), just prevents blocking further net namespace
creation/deletion.

> if I can't run out of some resources (kworker threads?)

there is a limit, yes, and once it's hit namespace cleanup will
essentially stop, and all further net namespaces will be leaked.
However, there's really just no way to avoid that without fixing the
actual dst leaks, which I'd still like to try to add debug to help
identify.

I've been busy elsewhere last week but I'll prepare the patch to send
upstream this week, and then look at adding debug to actually find the
dst leak.

Thanks!

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

Title:
  unregister_netdevice: waiting for lo to become free

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