netdev - Re: "ip netns create" hangs forever, spamming console with "unregister_netdevice: waiting for lo to become free"

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Message-ID: <CAKCAbMjpRyfZ5OjY6SEygJfmo4AxVPsd+rjMJP1UWS8aQT-HEg@mail.gmail.com>
Date:	Mon, 15 Jun 2015 13:34:05 -0400
From:	Zack Weinberg <zackw@...ix.com>
To:	Joe Stringer <joestringer@...ira.com>
Cc:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: "ip netns create" hangs forever, spamming console with
 "unregister_netdevice: waiting for lo to become free"

On Sun, Jun 7, 2015 at 11:56 PM, Joe Stringer <joestringer@...ira.com> wrote:
>
> Hi Zack, have you had any further development on this issue?

Sorry for the delay.  The only additional piece of information I have
for you is that
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1403152 may be
another report of the same bug, or a closely-related one.

I am fairly sure this would be easy to fix if someone could just come
up with a reliable reproducer, but I've had no further luck myself,
although that Ubuntu bug did give me an idea -- specifically, it might
be necessary to make a lot of outbound connections from within a
network namespace to trigger the problem.  I am juggling several other
issues right now and haven't had time to follow up on that idea.

zw
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