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

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Date:	Wed, 30 Mar 2011 09:12:43 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Jens Axboe <axboe@...nel.dk>
CC:	Vivek Goyal <vgoyal@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Bug at for-2.6.39/core

Jens Axboe wrote:
> 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.

Ok, I see.

Thanks,
Gui

> 
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