linux-kernel - Re: Oops in 2.6.19.1

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Message-ID: <200612201550_MC3-1-D5C7-74C6@compuserve.com>
Date:	Wed, 20 Dec 2006 15:48:27 -0500
From:	Chuck Ebbert <76306.1226@...puserve.com>
To:	Alistair John Strachan <s0348365@....ed.ac.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Oops in 2.6.19.1

In-Reply-To: <200612201421.03514.s0348365@....ed.ac.uk>

On Wed, 20 Dec 2006 14:21:03 +0000, Alistair John Strachan wrote:

> Any ideas?
> 
> BUG: unable to handle kernel NULL pointer dereference at virtual address 
> 00000009

    83 ca 10                  or     $0x10,%edx
    3b                        .byte 0x3b
    87 68 01                  xchg   %ebp,0x1(%eax)   <=====
    00 00                     add    %al,(%eax)

Somehow it is trying to execute code in the middle of an instruction.
That almost never works, even when the resulting fragment is a legal
opcode. :)

The real instruction is:

    3b 87 68 01 00 00 00        cmp    0x168(%edi),%eax

I'd guess you have some kind of hardware problem.  It could also be
a kernel problem where the saved address was corrupted during an
interrupt, but that's not likely.
-- 
MBTI: IXTP
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