Comment 84 for bug 1711407

Hi Dan,

We're using a newer kernel:

4.4.0-109-generic #132-Ubuntu SMP Tue Jan 9 19:52:39 UTC 2018 x86_64 x86_64
x86_64 GNU/Linux

Would you be able to build a test kernel against this version?

Thanks very much, Dan.

On Tue, May 1, 2018 at 12:14 AM, Dan Streetman <email address hidden>
wrote:

> > 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
>
> ok, great. You didn't mention what release you're using on gcp, but I
> have a 4.13 test kernel in this ppa, with patches to specifically
> fix/workaround the hanging problem:
> https://launchpad.net/~ddstreet/+archive/ubuntu/lp1711407
>
> Note that *only* version 4.13.0-38.43+hf1711407v20180413b1 in that ppa
> has the patches to workaround the hanging. If you need a different
> version, let me know and I can apply the patches and build for whatever
> release you need (just give me the 'uname -a' output).
>
> The details of the cause of this problem is back in comment 72, if you
> want that info. I'm preparing to send the workaround patch upstream;
> after that, there will be (likely ongoing) work to debug the various
> dst/object leaks and kernel socket "leaks" that are actually causing the
> symptoms.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1711407
>
> Title:
> 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.
>
> --
>
> [Impact]
>
> 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 =
> 1
>
> 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-
> samba-loop
>
> To manage notifications about this bug go to:
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> 1711407/+subscriptions
>