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Date:	Wed, 11 Nov 2009 17:19:49 -0500
From:	Glenn Maynard <glenn@...t.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: Crash during SATA reads

On Wed, Nov 11, 2009 at 4:39 PM, Jeff Garzik <jeff@...zik.org> wrote:
> I would poke Jens Axboe (block maintainer) and linux-scsi, the issuer of
> these commands.

(Looks like you poked for me; thanks.)

> Also, providing filesystem info (ext3? ext4? XFS? btrfs?) and info on your
> workload would be helpful.

These crashes happen while running "dd if=/dev/sdb | gzip > /dev/null"
in 2.6.31.6.  I'm just making a raw image of another drive.  Removing
gzip masks the problem.  It happens anywhere between almost
immediately to after running for 15-30 minutes.

All filesystems are XFS, but none of sdb's partitions are mounted and
I'm reading the device directly (/dev/sdb, not a partition).  The
system that's making the image is mounted read-only and isn't running
anything else.

(Another backtrace at http://lkml.org/lkml/2009/11/11/81.)

Here's a curious one; EIP appears to be in data:

Pid: 1312, comm: gzip Not tainted (2.6.31.6 #6) G31M-ES2L
EIP: 0060:[<c1ae78e4>] EFLAGS: 00010286 CPU: 0
EIP is at 0xc1ae78e4
EAX: c1ae78c0 EBX: c107ccb1 ECX: c1ae78c0 EDX: 00000001
ESI: c1ae78c0 EDI: dfa39069 EBP: c7d29ed0 ESP: c7d29e94
 DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
Process gzip (pid: 1312, ti=c7d28000 task=df8b6080 task.ti=c7d28000)
Stack:
 c107ccc1 c107e559 00000200 c11587cc 00000000 df8a6c80 dfa07168 00000000
<0> 00000000 0000c000 00004000 00000000 dfa39068 00000000 dfa39068 dfa07168
<0> c1158946 df8a6c80 00000000 c11589fd 00000000 df8a6c80 00000000 dfa39068
Call Trace:
 [<c107ccc1>] ? end_bio_bh_io_sync+0x30/0x38
 [<c107e559>] ? bio_endio+0x24/0x26
 [<c11587cc>] ? blk_update_request+0xdf/0x24e
 [<c1158946>] ? blk_update_bidi_request+0xb/0x41
 [<c11589fd>] ? blk_end_bidi_request+0x10/0x4f
 [<c1158a6c>] ? blk_end_request+0x7/0xc
 [<c11abcc2>] ? scsi_end_request+0x17/0x69
 [<c11abfd3>] ? scsi_io_completion+0x173/0x335
 [<c11a8340>] ? scsi_finish_command+0x70/0x86
 [<c11ac6b6>] ? scsi_softirq_done+0xd7/0xdc
 [<c115b401>] ? blk_done_softirq+0x51/0x5d
 [<c101bde0>] ? __do_softirq+0x5f/0xc8
 [<c101be6b>] ? do_softirq+0x22/0x26
 [<c101becd>] ? irq_exit+0x29/0x34
 [<c1004097>] ? do_IRQ+0x53/0x63
 [<c1002ea9>] ? common_interrupt+0x29/0x30
Code: 00 00 00 00 00 00 00 c0 72 77 83 00 00 00 00 40 79 ae c1 40 8e
4c df 09 00 00 f0 00 00 00 00 01 00 00 00 01 00 00 00 00 00 00 00 <00>
02 00 00 00 02 00 00 04 00 00 00 ff ff ff ff 01 00 00 00 08
EIP: [<c1ae78e4>] 0xc1ae78e4 SS:ESP 0068:c7d29e94
CR2: 0000000000000001
---[ end trace fb168fcf160f6893 ]---

-- 
Glenn Maynard
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