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Date: Fri, 5 Aug 2005 20:09:45 +0200
From: Marc Ballarin <Ballarin.Marc@gmx.de>
To: Antoine Martin <antoine@nagafix.co.uk>
Cc: jmorris@namei.org, linux-kernel@vger.kernel.org, sds@epoch.ncsc.mil
Subject: Re: preempt with selinux NULL pointer dereference
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On Fri, 05 Aug 2005 17:46:13 +0100
Antoine Martin <antoine@nagafix.co.uk> wrote:

> > > [ 4788.218995] Pid: 19002, comm: ssh Tainted: G   M  2.6.13-rc5
> > 
> > Which of your modules is non-GPL and can you please remove them and see if 
> > there's still a problem?
> Hmm. I occasionally use out-of-tree drivers (wlan cards mainly) so I
> thought these could be the culprit, but all the above are in the source
> tree (I keep the others out):

>>From Documentation/oops-tracing.txt:
'G' if all modules loaded have a GPL or compatible license, 'P' if
 any proprietary module has been loaded.
...

In other words, your kernel is tainted, but all modules are GPL.

See also the check in panic.c:
...
tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
...

It seems that yout kernel was tainted by a machine check exception (MCE).
This should be visible in dmesg somewhere, and might indicate a hardware
problem.

Regards