netdev - Re: kernel >= 4.0: crashes when using traceroute6 with isatap

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Message-ID: <1489362.AtetvSCXN1@h2o.as.studentenwerk.mhn.de>
Date:	Thu, 07 May 2015 00:11:20 +0200
From:	Wolfgang Walter <linux@...m.de>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: kernel >= 4.0: crashes when using traceroute6 with isatap

Am Mittwoch, 6. Mai 2015, 11:15:18 schrieben Sie:
> (Cc'ing netdev.)
> 
> On Sat, May 2, 2015 at 5:29 AM, Wolfgang Walter <linux@...m.de> wrote:
> > Am Samstag, 2. Mai 2015, 02:16:36 schrieb Wolfgang Walter:
> >> Hello,
> >> 
> >> kernel 4.0 (and 4.0.1) crashes immediately when I use traceroute6 with an
> >> isatap-tunnel.
> > 
> > I did some further tests. To trigger the crash you need
> > 
> > * isatap-tunnel (probably any sit-tunnel will do it)
> > * raw-socket
> > * udp
> > 
> > Using icmpv6 or tcp i.e. does not trigger it.
> 
> Do you have a script to reproduce it?
> 
> 
> Thanks for the bug report!

You need a isatap-server with say ipv4-address $X

Then, on host with 4.0, start isatapd: isatapd --mtu 1280 $X 

then do

	traceroute6 www.google.de

Regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
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