linux-kernel - Re: Bug at for-2.6.39/core

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Message-ID: <4D91AB5C.8030203@kernel.dk>
Date:	Tue, 29 Mar 2011 11:50:20 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
CC:	Vivek Goyal <vgoyal@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Bug at for-2.6.39/core

On 2011-03-29 11:47, Gui Jianfeng wrote:
> Hi Jens,
> 
> I trigger an OOPS when testing, the following script can reproduce
> this bug on my box.
> 
> #!/bin/sh
> 
> mkdir /mnt/blkio
> mount -t cgroup -o blkio blkio /mnt/blkio/
> mkdir /mnt/blkio/test1 /mnt/blkio/test2
> echo noop > /sys/block/sdb/queue/scheduler
> dd iflag=direct if=/dev/sdb of=/dev/null bs=4k &
> echo $! > /mnt/blkio/test1/tasks
> dd iflag=direct if=/dev/sdb of=/dev/null bs=4k &
> echo $! > /mnt/blkio/test2/tasks
> sleep 3
> echo cfq > /sys/block/sdb/queue/scheduler
> 
> ----
> eBUG: unable to handle kernel NULL pointer dereference at 0000000000000008
> IP: [<ffffffff812200e8>] cfq_completed_request+0x38/0x7f0

This is a known bug, update to Linus' current -git and it's fixed.

-- 
Jens Axboe

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