linux-kernel - Re: [GIT PULL] Core block IO bits for 2.6.39

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Date:	Thu, 24 Mar 2011 19:58:31 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: [GIT PULL] Core block IO bits for 2.6.39 - early Oops

On 2011-03-24 19:54, Markus Trippelsdorf wrote:
> On 2011.03.24 at 19:51 +0100, Jens Axboe wrote:
>> On 2011-03-24 19:36, Jens Axboe wrote:
>>> On 2011-03-24 19:30, Markus Trippelsdorf wrote:
>>>> On 2011.03.24 at 14:43 +0100, Jens Axboe wrote:
>>>>>
>>>>> This is the main pull request for the block IO layer and friends for
>>>>> 2.6.39.
>>>>
>>>> This merge results in an early oops on my system (amd64, xfs).
>>>> See the attached photo.
>>>>
>>>
>>> Auch. Can you ensure that you have CONFIG_DEBUGINFO=y in your .config
>>> and then do:
>>>
>>> $ gdb vmlinux
>>> ...
>>> l *cfq_insert_request+0x32
>>>
>>> and send that output?
>>
>> I took a closer look at the oops, and it most likely looks like q ==
>> NULL (offset 0x18 == q->elevator). You left out the Code part, so I
>> can't verify that for certain. Which makes very little sense. I take it
>> this is 100% reproducible? When you send the gdb output, please also
>> attach your .config.
> 
> Yes, it's 100% reproducible here. My .config follows:

Can you try this patch and see if it makes a difference?

If you boot without the patch and add elevator=noop, does it then work?


-- 
Jens Axboe

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