Re: [PATCH UPDATED 4/5] dm: implement REQ_FLUSH/FUA support for request-baseddm

[Tejun Heo]

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
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