Messages in this thread | | | Date | Tue, 29 Mar 2011 11:50:20 +0200 | From | Jens Axboe <> | Subject | Re: Bug at for-2.6.39/core |
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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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