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Date:	Sat, 01 Dec 2007 13:47:06 +0100
From:	Udo van den Heuvel <udovdh@...all.nl>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: possible BUG: unable to handle kernel NULL pointer dereference
 at virtual address 00000000

Cyrill Gorcunov wrote:
> [Udo van den Heuvel - Sat, Dec 01, 2007 at 12:00:53PM +0100]
> | I only had teh bug once, that was the reason for my post.
> | Since then the system has been busy, with intervals, doing kernel
> | compiles and no repeat of the BUG yet...
> | It's a VIA EN12000 with 1GB of RAM. How could I increase the chances of
> | hitting it?
> 
> if my guessing is right - the only chance to hit it faster - is to increase
> files' activity i.e. compiling the kernel involves a lot of file being readed
> thru dcache system. First we have to locate the bug on a pure kernel
> and 'case it's a rare thing to happen... well I don't really know how to
> get it up to known point. So i think you could play with a pure kernel
> by compiling it or run several copies of 'grep' thru kernel searching
> the same pattern like "grep -r -n for ./*" in kernel sources. But Udo,
> I'm not a kernel specialist so my suggestions could be not really usefull ;)

Ok, maybe someone else can improve on this:
I now have 12 screen'ed sessions running in /usr/src/linux with:
while true; do grep -r -n for ./*; done

Every now and then I can check dmesg.

Would that be enough?

Udo
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