linux-kernel - Re: 2.6.26-git: NULL pointer deref in __switch

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Message-ID: <48537502.4090102@trash.net>
Date:	Sat, 14 Jun 2008 09:36:34 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
CC:	Vegard Nossum <vegard.nossum@...il.com>,
	Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Chuck Ebbert <cebbert@...hat.com>, x86@...nel.org
Subject: Re: 2.6.26-git: NULL pointer deref in __switch_to

Suresh Siddha wrote:
> On Fri, Jun 13, 2008 at 11:24:01AM -0700, Vegard Nossum wrote:
>   
>> On Fri, Jun 13, 2008 at 7:42 PM, Patrick McHardy <kaber@...sh.net> wrote:
>>     
>>> [62060.043009] BUG: unable to handle kernel NULL pointer dereference at
>>> 000001ff
>>> [62060.043009] IP: [<c0102a9b>] __switch_to+0x2f/0x118
>>> [62060.043009] *pde = 00000000
>>> [62060.043009] Oops: 0002 [#1] PREEMPT
>>>       
>
> Patrick, Do you see any other error messages before this BUG stmt? Can you
> please provide the complete kernel log till the point of failure?
>   

The oops is usually the first message after the boot messages.
I've attached a log.

> I have a theory for your problem and have appended a patch to test it. Can
> you please check if the appended patch fixes your problem.
>   

Yes, thanks. It usually it takes a day to trigger though.



View attachment "log" of type "text/plain" (25351 bytes)