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

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Message-ID: <CADdae-hyq7RALEg6fOTQZc_cDoi8PnovBZ2xNdsZRNTqfJnORA@mail.gmail.com>
Date:	Fri, 20 Jul 2012 22:52:40 +0200
From:	nicolas prochazka <prochazka.nicolas@...il.com>
To:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
Cc:	Dave Jones <davej@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: oops in kernel ( 3.4.x -> 3.5rc )

Hello
the problem is occured with  :
- linux kernel 3.4.5    i do not test with 3.4.0 / 1 / 2 / 3 / 4    ,
but i can if you want
- linux kernel 3.5rc6 rc7  / do not test with other rc.

the problem is not occured with :
linux kernel 3.3.4 / 3.3.8

These servers are used for :
- starting a lot of virtual machine with qemu-kvm ( ~ 40 )   ( lot of
select i think)
- do a lot of network tests with openvswitch

I can test a kernel 3.4.x before and after a commit id (?) to find a regression.

Regards,
Nicolas.


2012/7/20 Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>:
> 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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