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Date: Fri, 07 Jun 2013 14:26:08 -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 19:52 +0200, Steinar H. Gunderson wrote: > 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). 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? You can also cat /proc/modules. It gives you where the modules are located. -- Steve -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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