From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Subject: Re: sctp netns "unregister_netdevice: waiting for lo to become free.
 Usage count = 1"
Date: Tue, 30 Jan 2018 20:52:27 -0200
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Cc: Vlad Yasevich <vyasevich@gmail.com>,
        Neil Horman <nhorman@tuxdriver.com>,
        linux-sctp@vger.kernel.org,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>
To: Tommi Rantala <tommi.t.rantala@nokia.com>
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On Mon, Jan 29, 2018 at 05:55:45PM +0200, Tommi Rantala wrote:
> Hi,
> 
> When running sctp_test from lksctp-tools in netns in 4.4 and 4.9 with
> suitable arguments, the local loopback device in the netns is not getting
> destroyed after deleting the netns.
> 
...
> 
> Based on a quick test, 4.14 and 4.15 does not suffer from this, but its
> reproducible e.g. in 4.4.113 and 4.9.75
> 
> Any ideas?

By the versions you mentioned and report, maybe f186ce61bb82 ("Fix an
intermittent pr_emerg warning about lo becoming free.") fixed it.

  Marcelo