linux-kernel - Re: next-20081215: kernel BUG at block/cfq-iosched.c:1243

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Date:	Mon, 15 Dec 2008 23:09:24 +0300
From:	"Alexander Beregalov" <a.beregalov@...il.com>
To:	"Jens Axboe" <jens.axboe@...cle.com>
Cc:	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: next-20081215: kernel BUG at block/cfq-iosched.c:1243

2008/12/15 Jens Axboe <jens.axboe@...cle.com>:
> On Mon, Dec 15 2008, Alexander Beregalov wrote:
>> 2008/12/15 Jens Axboe <jens.axboe@...cle.com>:
>> >> [   23.080733] kernel BUG at block/cfq-iosched.c:1243!
>> >> [   23.080733] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
>>
>> > Odd, is it reproducible? What is your .config?
>> Yes, it is
>>
>> Config is in attach
>
> It's weird, because the only change for CFQ in that area is the one
> below. Does the oops go away if you back this out?
Yes, it can boot without the patch, no oops.

> From 030a3f02bb42fad91ae84c99924fe3ee162a634d Mon Sep 17 00:00:00 2001
> From: Jens Axboe <jens.axboe@...cle.com>
> Date: Fri, 12 Dec 2008 15:56:31 +0100
> Subject: [PATCH] cfq-iosched: fix race between exiting queue and exiting task
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