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

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Date:	Thu, 24 Mar 2011 20:57:41 +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 20:45, Markus Trippelsdorf wrote:
> On 2011.03.24 at 20:36 +0100, Jens Axboe wrote:
>> On 2011-03-24 20:34, Markus Trippelsdorf wrote:
>>> On 2011.03.24 at 19:58 +0100, Jens Axboe wrote:
>>>> 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?
>>>
>>> There's no patch ;-)
>>
>> Oh, here it is.
>>
> It doesn't help, unfortunately. I still get the same BUG at
> cfq_insert_request+0x32/0x4d0.

OK, still a data point. What was the last -git kernel you used?

-- 
Jens Axboe

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