linux-kernel - Re: oops in kernel ( 3.4.x -> 3.5rc )

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Message-ID: <20120720202155.GB15677@oc1711230544.ibm.com>
Date:	Fri, 20 Jul 2012 17:21:55 -0300
From:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
To:	Dave Jones <davej@...hat.com>,
	nicolas prochazka <prochazka.nicolas@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: oops in kernel ( 3.4.x -> 3.5rc )

On Fri, Jul 20, 2012 at 09:21:53AM -0400, Dave Jones wrote:
> On Fri, Jul 20, 2012 at 11:56:06AM +0200, nicolas prochazka wrote:
> 
>  > [ 2384.900061] BUG: unable to handle kernel paging request at 000000010000002f
> 
> That '1' looks like a random bit flip. Try running memtest86.
> 

Looks more a 32-bit value of 1 followed by a 32-bit value of 0x2f. Most
likely a pointer to some other piece of a struct. However, taking a look
at fs/files.c code, nothing seems suspicious.

Nicolas, it wasn't clear to me if you had problems with 3.4 too. There
has been some changes in fs/files.c on 3.4-rc1 in the piece of code
where you hit the problem.

What does your system exercise? Any chance you are using a lot of
select, which has also been changed in those same patches to fs/files.c?

Regards.
Cascardo.


>  > [ 2384.910010] Pid: 23838, comm: queue.sh Tainted: G      D W
> 
> This wasn't the first problem either.
> 
>  > [ 2397.885344] BUG: unable to handle kernel paging request at 000000010000003b
> 
> Looks like the same flipped bit.
> 
> 	Dave
> 
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