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

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Message-ID: <20130607084303.GE15083@uio.no>
Date:	Fri, 7 Jun 2013 10:43:03 +0200
From:	"Steinar H. Gunderson" <sgunderson@...foot.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, davem@...emloft.net,
	netdev@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: NULL pointer dereference when loading the gre module (3.10.0-rc4)

On Thu, Jun 06, 2013 at 11:06:48PM -0400, Steven Rostedt wrote:
> Note the faulting address is 0xffffffffa0e52001, which is around the
> above address, be interesting to know what was at that location.

Aha, the plot thickens:

root      6095  0.0  0.0   6632   596 ?        D    Jun06   0:00 /sbin/modprobe -q -- net-pf-17

pannekake:/usr/src/linux-3.10-rc4> sudo cat /proc/6095/stack
[<ffffffff812bb04f>] register_pernet_subsys+0x18/0x39
[<ffffffffa0ffd089>] packet_init+0x32/0x44 [af_packet]
[<ffffffff81000263>] do_one_initcall+0x7b/0x10c
[<ffffffff8107e5db>] load_module+0x1b1f/0x1e19
[<ffffffff8107e969>] SyS_init_module+0x94/0xa1
[<ffffffff8138cf12>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff

I have a tcpdump running almost all the time (from boot), for a variety of
reasons. And I think I have the BPF JIT on; possibly related.

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