linux-kernel - Re: mcdx -- do_request(): non-read command to cd!!

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Date:	Tue, 03 Apr 2007 20:14:00 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
CC:	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: mcdx -- do_request(): non-read command to cd!!

On 04/03/2007 07:31 PM, Pekka J Enberg wrote:

> Oh, well, here goes. Rene, would you be so kind and spin the wheel once 
> more? =)

Absolutely!

root@...2:~# dd if=/dev/mcdx0 of=/dev/null

Oops: 0002 [#1]
CPU:    0
EIP:    0060:[<c1047787>]    Not tainted VLI
EFLAGS: 00010082   (2.6.20.4 #11)
EIP is at free_block+0x58/0xcf
eax: 07ff46c6   ebx: c1d5f100   ecx: c1d5f12c   edx: 160010b9
esi: c16414e0   edi: c160c960   ebp: 00000001   esp: c1575ef0
ds: 007b   es: 007b   ss: 0068
Process events/0 (pid: 4, ti=c1575000 task=c1577510 task.ti=c1575000)
Stack: 00000000 00000002 c165fa38 c165fa38 00000002 c165fa00 00000000 
c1047eb6
        00000000 00000000 c16414e0 c160c960 c16414e0 c160c960 c14ab540 
00000292
        c1047f3a 00000000 00000000 00000292 c14ab544 c154ebc0 c101ec7a 
c154ec14
Call Trace:
  [<c1047eb6>] drain_array+0x94/0xc3
  [<c1047f3a>] cache_reap+0x55/0xe9
  [<c101ec7a>] run_workqueue+0x8f/0x14d
  [<c1047ee5>] cache_reap+0x0/0xe9
  [<c101ee5a>] worker_thread+0x122/0x14b
  [<c100e2d8>] default_wake_function+0x0/0xc
  [<c100e2d8>] default_wake_function+0x0/0xc
  [<c101ed38>] worker_thread+0x0/0x14b
  [<c1021800>] kthread+0x72/0x97
  [<c102178e>] kthread+0x0/0x97
  [<c1002b47>] kernel_thread_helper+0x7/0x10
  =======================
Code: 05 03 15 4c ab 4a c1 8b 02 f6 c4 40 74 03 8b 52 0c 8b 02 a8 80 75 
04 0f 0b eb fe 8b 5a 1c 8b 44 24 20 8b 53 04 8b 74 87 18 8b 03 <89> 02 
c7 03 00 01 10 00 89 50 04 c7 43 04 00 02 20 00 8b 44 24
EIP: [<c1047787>] free_block+0x58/0xcf SS:ESP 0068:c1575ef0

That is, the exact same oops the tar test showed which I expect is 
progress -- the dd is now in fact doing something :-)

When I now switched the monitor to 5va2 itself it was happily generating 
more oopses and supposedly "fixing up recursive faults", while advicing 
me to reboot. 2 seconds later it didn't leave me a choice as it dropped 
dead :-)

Just to keep track, I'm now using the patches (minus 03) at:

http://members.home.nl/rene.herman/mcdx/

(for lkml: with 03, the machine locks itself hard each and every time 
without information).

Thanks again :)

Rene.

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