From: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: Vivek Goyal <vgoyal@redhat.com>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: Bug at for-2.6.39/core
Date: Wed, 30 Mar 2011 09:12:43 +0800 [thread overview]
Message-ID: <4D92838B.4070706@cn.fujitsu.com> (raw)
In-Reply-To: <4D91AB5C.8030203@kernel.dk>
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
>
prev parent reply other threads:[~2011-03-30 1:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-29 9:47 Bug at for-2.6.39/core Gui Jianfeng
2011-03-29 9:50 ` Jens Axboe
2011-03-30 1:12 ` Gui Jianfeng [this message]
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