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

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Message-ID: <20130607175233.GA20230@uio.no>
Date:	Fri, 7 Jun 2013 19:52:33 +0200
From:	"Steinar H. Gunderson" <sgunderson@...foot.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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, Jun 07, 2013 at 12:12:23PM -0400, Steven Rostedt wrote:
>> Ffffffffa0e76000 u ip_tunnel_init_net   [ip_gre]
> What do you get if you do an objdump -Dr ip_gre.ko
> 
> And then look for ipgre_init, and then subtract 0xb053 (45139) from its
> address. As that is: ffffffffa0e81055 - ffffffffa0e76002, then see if
> that object file has anything in that location.

pannekake:~> objdump -Dr /lib/modules/3.10.0-rc4/kernel/net/ipv4/ip_gre.ko | grep ipgre_init        
0000000000000000 <ipgre_init_net>:                                                          
   0:	8b 35 00 00 00 00    	mov    0x0(%rip),%esi        # 6 <ipgre_init_net+0x6>
  13:	e8 00 00 00 00       	callq  18 <ipgre_init_net+0x18>

Ie., the symbol doesn't show up in the disassembly (for whatever reason).

/* Steinar */
-- 
Homepage: http://www.sesse.net/
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