From: Tejun Heo <tj@kernel.org>
To: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Cc: Mike Snitzer <snitzer@redhat.com>,
jaxboe@fusionio.com, j-nomura@ce.jp.nec.com, jamie@shareable.org,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-raid@vger.kernel.org, hch@lst.de
Subject: Re: [PATCH UPDATED 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm
Date: Thu, 02 Sep 2010 15:32:32 +0200 [thread overview]
Message-ID: <4C7FA770.7070004@kernel.org> (raw)
In-Reply-To: <4C7FA531.7060300@kernel.org>
On 09/02/2010 03:22 PM, Tejun Heo wrote:
> Hello,
>
> On 09/01/2010 09:15 AM, Kiyoshi Ueda wrote:
>> I don't see any obvious problem on this patch.
>> However, I hit a NULL pointer dereference below when I use a mpath
>> device with barrier option of ext3. I'm investigating the cause now.
>> (Also I'm not sure the cause of the hang which Mike is hitting yet.)
>>
>> I tried on the commit 28dd53b26d362c16234249bad61db8cbd9222d0b of
>> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git flush-fua.
>>
>> # mke2fs -j /dev/mapper/mpatha
>> # mount -o barrier=1 /dev/mapper/mpatha /mnt/0
>> # dd if=/dev/zero of=/mnt/0/a bs=512 count=1
>> # sync
>
> Hmm... I'm trying to reproduce this problem but hasn't been successful
> yet.
>
>> BUG: unable to handle kernel NULL pointer dereference at 0000000000000078
>> IP: [<ffffffffa0070ec3>] scsi_finish_command+0xa3/0x120 [scsi_mod]
>
> Can you please ask gdb which source line this is?
Ooh, never mind. Reproduced it.
Thanks.
--
tejun
next prev parent reply other threads:[~2010-09-02 13:32 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1283162296-13650-1-git-send-email-tj@kernel.org>
2010-08-30 9:58 ` [PATCH 1/5] block: make __blk_rq_prep_clone() copy most command flags Tejun Heo
2010-08-30 9:58 ` [PATCH 2/5] dm: implement REQ_FLUSH/FUA support for bio-based dm Tejun Heo
2010-08-30 9:58 ` [PATCH 3/5] dm: relax ordering of bio-based flush implementation Tejun Heo
2010-09-01 13:51 ` Mike Snitzer
2010-09-01 13:56 ` Tejun Heo
2010-09-03 6:04 ` Kiyoshi Ueda
2010-09-03 9:42 ` Tejun Heo
2010-08-30 9:58 ` [PATCH 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm Tejun Heo
2010-08-30 9:58 ` [PATCH 5/5] block: remove the WRITE_BARRIER flag Tejun Heo
[not found] ` <1283162296-13650-5-git-send-email-tj@kernel.org>
2010-08-30 13:28 ` [PATCH 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm Mike Snitzer
2010-08-30 13:59 ` Tejun Heo
2010-08-30 15:07 ` Tejun Heo
2010-08-30 19:08 ` Mike Snitzer
2010-08-30 21:28 ` Mike Snitzer
2010-08-31 10:29 ` Tejun Heo
2010-08-31 13:02 ` Mike Snitzer
2010-08-31 13:14 ` Tejun Heo
2010-08-30 15:42 ` [PATCH] block: initialize flush request with WRITE_FLUSH instead of REQ_FLUSH Tejun Heo
2010-08-30 15:45 ` [PATCH UPDATED 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm Tejun Heo
2010-08-30 19:18 ` Mike Snitzer
2010-09-01 7:15 ` Kiyoshi Ueda
2010-09-01 12:25 ` Mike Snitzer
2010-09-02 13:22 ` Tejun Heo
2010-09-02 13:32 ` Tejun Heo [this message]
2010-09-03 5:46 ` Kiyoshi Ueda
2010-09-02 17:43 ` [PATCH] block: make sure FSEQ_DATA request has the same rq_disk as the original Tejun Heo
2010-09-03 5:47 ` Kiyoshi Ueda
2010-09-03 9:33 ` Tejun Heo
2010-09-03 10:28 ` Kiyoshi Ueda
2010-09-03 11:42 ` Tejun Heo
2010-09-03 11:51 ` Kiyoshi Ueda
[not found] ` <1283162296-13650-3-git-send-email-tj@kernel.org>
2010-09-01 13:43 ` [PATCH 2/5] dm: implement REQ_FLUSH/FUA support for bio-based dm Mike Snitzer
2010-09-01 13:50 ` Tejun Heo
2010-09-01 13:54 ` Mike Snitzer
2010-09-01 13:56 ` Tejun Heo
[not found] ` <1283162296-13650-2-git-send-email-tj@kernel.org>
2010-09-01 15:30 ` [PATCH 1/5] block: make __blk_rq_prep_clone() copy most command flags Christoph Hellwig
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