netdev - Re: sctp netns "unregister_netdevice: waiting for lo to become free. Usage count = 1"

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Message-ID: <20180130210353.GB25399@hmswarspite.think-freely.org>
Date:   Tue, 30 Jan 2018 16:03:53 -0500
From:   Neil Horman <nhorman@...driver.com>
To:     Tommi Rantala <tommi.t.rantala@...ia.com>
Cc:     Vlad Yasevich <vyasevich@...il.com>, linux-sctp@...r.kernel.org,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: sctp netns "unregister_netdevice: waiting for lo to become free.
 Usage count = 1"

On Tue, Jan 30, 2018 at 09:24:17PM +0200, Tommi Rantala wrote:
> On 30.01.2018 17:59, Neil Horman wrote:
> > On Mon, Jan 29, 2018 at 05:55:45PM +0200, Tommi Rantala wrote:
> > > 
> > > ip netns add TEST
> > > ip netns exec TEST ip link set lo up
> > > ip link add dummy0 type dummy
> > > ip link add dummy1 type dummy
> > > ip link add dummy2 type dummy
> > > ip link set dev dummy0 netns TEST
> > > ip link set dev dummy1 netns TEST
> > > ip link set dev dummy2 netns TEST
> > > ip netns exec TEST ip addr add 192.168.1.1/24 dev dummy0
> > > ip netns exec TEST ip link set dummy0 up
> > > ip netns exec TEST ip addr add 192.168.1.2/24 dev dummy1
> > > ip netns exec TEST ip link set dummy1 up
> > > ip netns exec TEST ip addr add 192.168.1.3/24 dev dummy2
> > > ip netns exec TEST ip link set dummy2 up
> > > ip netns exec TEST sctp_test -H 192.168.1.2 -P 20002 -h 192.168.1.1 -p 20000
> > > -s -B 192.168.1.3
> > > ip netns del TEST
> > > 
> > Does the problem occur if you don't set lo up?
> 
> Still happens after dropping "ip netns exec TEST ip link set lo up".
> 
> Omitting "-B 192.168.1.3" from the sctp_test args helps.
> 
Thats....wierd.  I'll look at the sctp_test code in the AM
Neil

> Tommi
>