netdev - Re: xfrm, ip tunnel: non released device reference upon device unregistration

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Date:   Tue, 6 Feb 2018 14:21:51 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Florian Westphal <fw@...len.de>
CC:     Eyal Birger <eyal.birger@...il.com>, <netdev@...r.kernel.org>,
        <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <shmulik@...anetworks.com>
Subject: Re: xfrm, ip tunnel: non released device reference upon device
 unregistration

On Tue, Feb 06, 2018 at 02:15:09PM +0100, Florian Westphal wrote:
> Steffen Klassert <steffen.klassert@...unet.com> wrote:
> > I gave the patch a quick try, but still I get this:
> > 
> > unregister_netdevice: waiting for dummy1 to become free. Usage count = 2
> 
> Was that with Eyals setup or the bridge one I posted?

It was with Eyals setup, sorry for not mentioning this.

> 
> If it was Eyals setup, its possible the patch missed hookup
> to whatever tunnel infra is used (the setup I used has ipip tunnel,
> everything is ipv4).

That might be, some IPv6 is involved with Eyals setup.