linux-kernel - Re: NULL pointer dereference when loading the gre module (3.10.0-rc4)

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Message-ID: <1370630659.9844.89.camel@gandalf.local.home>
Date:	Fri, 07 Jun 2013 14:44:19 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Steinar H. Gunderson" <sgunderson@...foot.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, davem@...emloft.net,
	netdev@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	Pravin B Shelar <pshelar@...ira.com>
Subject: Re: NULL pointer dereference when loading the gre module
 (3.10.0-rc4)

On Fri, 2013-06-07 at 20:34 +0200, Steinar H. Gunderson wrote:
> On Fri, Jun 07, 2013 at 02:26:08PM -0400, Steven Rostedt wrote:
> > On Fri, 2013-06-07 at 19:52 +0200, Steinar H. Gunderson wrote:
> > Ah, that's because of this: module_init(ipgre_init);  Where it makes it
> > into:
> > 
> > 00000000 <init_module>:
> >    0:   55                      push   %ebp
> >    1:   89 e5                   mov    %esp,%ebp
> >    3:   53                      push   %ebx
> >    4:   83 ec 08                sub    $0x8,%esp
> >    7:   c7 04 24 00 00 00 00    movl   $0x0,(%esp)
> >                         a: R_386_32     .rodata.str1.4
> > 
> > We can use ipgre_tap_init_net, and the offset of 0xb032 (45106) as that
> > was 0xffffffffa0e5d034 - 0xffffffffa0e52002. Do you have CONFIG_NET_NS
> > set?
> 
> ipgre_tap_init_net is 000000000000001a, but there's no way I can subtract
> 0xb053 from that? Sorry, I'm confused. :-)

OK, then its most likely in another module (likely the ip_tunnel.ko).

Do know if you have CONFIG_NET_NS set in your .config?

> 
> > You can also cat /proc/modules. It gives you where the modules are
> > located.
> 
> I've booted back to 3.9.x already; I couldn't live with a crashing kernel like
> that. Unfortunately it's not that easy for me to reboot this machine all the
> time either. :-/

OK, if you get time, this may be a candidate to do a git bisect with.

Thanks,

-- Steve


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