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Date: Mon, 31 Jan 2011 09:01:14 -0600
From: Jason Wessel <jason.wessel@windriver.com>
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To: Kallol Biswas <nucleodyne@gmail.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: segmentation fault running under kgdb
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On 01/29/2011 08:30 PM, Kallol Biswas wrote:
>
> Here is the stack trace:
> (gdb) bt
> #0  kref_put (kref=0xffffffffffffffc9, release=0xffffffff8127b560
> <aa_free_profile_kref>) at lib/kref.c:67
> #1  0xffffffff8127b069 in aa_put_profile (udata=0xffff8801b7600000,
> size=<value optimized out>, add_only=<value optimized out>) at
> security/apparmor/include/policy.h:295

I have no idea about how apparmor works, but this looks like a legitimate kernel crash and kgdb is catching, just as I would expect.  If you want to continue on and pass the signal to the kernel's die notification system at the gdb prompt enter:

signal 9

I would recommend understanding the cause of each crash because because any null dereferences would lead me to wonder about the stability of the kernel you are running.

Jason.