Hi Dan,

> There's actually been quite a lot of discussion/work in this bug since 
> comment 2, so I don't 
> actually need that info anymore (except for reproduction steps, that's always 
> welcome).

Fair enough. I wish I had some reproduction steps but unfortunately it
just happens randomly and not because of any one action.

> Are you having any problems with the system *other* than just the log
messages?

Apologies here. I should have mentioned how it affects us. The symptoms
seen are a number of docker commands that just hang indefinitely (e.g.
docker ps, spinning up new containers). Occasionally, after a long time,
we have seen it come back and continue working OK (like whatever was
holding the lock released it finally), but most of the time it hangs
indefinitely. On occasion we can also use the -n parameter (e.g. docker
ps -n #) and it may or may not return a partial listing of running
containers. We've also found (again, not always) that we might be able
to stop a container if we use the container name or ID. When we strace
the process, we just see:

write(5, "GET /v1.24/containers/json?limit"..., 97) = 97
futex(0xc8200fa590, FUTEX_WAKE, 1)      = 1
futex(0x21fce50, FUTEX_WAIT, 0, NULL

... and that's as far as it goes. I do have a Docker stacktrace if you
want to see that.

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Title:
  unregister_netdevice: waiting for lo to become free

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