linux-kernel - Re: panics with 16port Promise Supertrack EX Controller

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Date:	Mon, 09 Jul 2007 11:59:36 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
CC:	Flavio Curti <lists.fcu@...way.org>, linux-kernel@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: panics with 16port Promise Supertrack EX Controller

Michal Piotrowski wrote:
> Hi Flavio,
> 
> On 09/07/07, Flavio Curti <lists.fcu@...way.org> wrote:
> 
>> Hello
>>
>> I have a problem with a server running 2.6.22rc4.
> 
> 
> Jul  8 00:19:13 dorade.cyberlink.ch EFLAGS: 00210046   
> (2.6.22-rc7-dorade #1)
> 
> Is this a regression?
> 
>> The machine panics
>> after some days of running fine, the machine inst heavy loaded.
>>
>> The Controller detects as stex device:
>>
>> scsi0 : stex
>> scsi 0:0:0:0: Direct-Access Promise 1X2 Mirror      1.10 PQ: 0 ANSI: 3
>> scsi 0:0:2:0: Direct-Access Promise  12+2 Disk RAID6  1.10 PQ: 0 ANSI: 3
>> scsi 0:0:16:0: Processor Promise RAID Console     1.00 PQ: 0 ANSI: 3
>> sd 0:0:0:0: [sda] 976642048 512-byte hardware sectors (500041 MB)
>> sd 0:0:0:0: [sda] Write Protect is off
>> sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't 
>> support DPO or FUA
>> sd 0:0:0:0: [sda] 976642048 512-byte hardware sectors (500041 MB)
>> sd 0:0:0:0: [sda] Write Protect is off
>> sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't 
>> support DPO or FUA
>>  sda: sda1 sda2
>> sd 0:0:0:0: [sda] Attached SCSI disk
>> sd 0:0:2:0: [sdb] Very big device.  Trying to use READ CAPACITY(16).
>> sd 0:0:2:0: [sdb] 11719704576 512-byte hardware sectors (6000489 MB)
>> sd 0:0:2:0: [sdb] Write Protect is off
>> sd 0:0:2:0: [sdb] Write cache: enabled, read cache: enabled, doesn't 
>> support DPO or FUA
>> sd 0:0:2:0: [sdb] Very big device.  Trying to use READ CAPACITY(16).
>> sd 0:0:2:0: [sdb] 11719704576 512-byte hardware sectors (6000489 MB)
>> sd 0:0:2:0: [sdb] Write Protect is off
>> sd 0:0:2:0: [sdb] Write cache: enabled, read cache: enabled, doesn't 
>> support DPO or FUA
>>  sdb: sdb1
>> sd 0:0:2:0: [sdb] Attached SCSI disk
>> sd 0:0:0:0: Attached scsi generic sg0 type 0
>> sd 0:0:2:0: Attached scsi generic sg1 type 0
>> scsi 0:0:16:0: Attached scsi generic sg2 type 3
>>
>> Im not sure where the problem is (controller/lvm/ext3), so if anyone has
>> an idea, Im happy to try it out...
> 
> 
> kernel BUG at block/as-iosched.c:1084!
> 
> BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[REQ_ASYNC]));

Could be a bug in the driver that just happens to be caught by AS checks.
If you could test another scheduler (boot with elevator=deadline or elevator=cfq),
it might help give us an idea.

-- 
SUSE Labs, Novell Inc.
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