[Bug 12874] New: Seagate STT20000A no longer works

[Bug 12874] New: Seagate STT20000A no longer works

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http://bugzilla.kernel.org/show_bug.cgi?id=12874

           Summary: Seagate STT20000A no longer works
           Product: IO/Storage
           Version: 2.5
     KernelVersion: 2.6.29-rc7
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IDE
        AssignedTo: io_ide@kernel-bugs.osdl.org
        ReportedBy: koraq@xs4all.nl


Latest working kernel version: 2.6.25
Earliest failing kernel version: 2.6.26
Distribution: Debian Lenny (tested with vanilla kernel)
Hardware Environment: i386
Problem Description: 
The Seagate STT20000A tapestreamer is no longer usable 
when modprobing the ide_tape module there's kernel BUG.

It was reported on the lkml[1][2], I tested with 2.6.29-rc7
and the problem still remains. Attached the boot dmesg and
the kernel BUG dmesg. Please let me know if more information
is needed. 

[1]http://marc.info/?l=linux-kernel&m=122203193728465&w=2
[2]http://marc.info/?l=linux-kernel&m=122202406417545&w=2


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------- Comment #1 from koraq@xs4all.nl  2009-03-15 01:25 -------
Created an attachment (id=20526)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20526&action=view)
dmesg after booting the system


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------- Comment #2 from koraq@xs4all.nl  2009-03-15 01:26 -------
Created an attachment (id=20527)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20527&action=view)
dmesg after modprobe ide_tape


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koraq@xs4all.nl changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Regression|0                           |1




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------- Comment #3 from sshtylyov@ru.mvista.com  2009-03-15 03:18 -------
(In reply to comment #1)
> Created an attachment (id=20526)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20526&action=view) [details]
> dmesg after booting the system

(In reply to comment #2)
> Created an attachment (id=20527)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20527&action=view) [details]
> dmesg after modprobe ide_tape

Please set the MIME type of these attachments to text/plain.


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[Bug 12874] Seagate STT20000A no longer works

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koraq@xs4all.nl changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #20526|application/octet-stream    |text/plain
          mime type|                            |




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koraq@xs4all.nl changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #20527|application/octet-stream    |text/plain
          mime type|                            |




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------- Comment #4 from koraq@xs4all.nl  2009-03-15 03:40 -------
(In reply to comment #3)
> (In reply to comment #1)
> > Created an attachment (id=20526)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20526&action=view) [details] [details]
> > dmesg after booting the system
> 
> (In reply to comment #2)
> > Created an attachment (id=20527)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20527&action=view) [details] [details]
> > dmesg after modprobe ide_tape
> 
> Please set the MIME type of these attachments to text/plain.
> 
Sorry I assumed the autodetection of bugzilla would set the 
proper type. Changed it now.


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bbpetkov@yahoo.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bbpetkov@yahoo.de




------- Comment #5 from bbpetkov@yahoo.de  2009-03-15 23:20 -------
Hi,

please do

objdump -d drivers/ide/ide-tape.o > ide-tape.dsm
make drivers/ide/ide-tape.s

and send me .dsm and .s files.

Thanks.


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------- Comment #6 from koraq@xs4all.nl  2009-03-18 16:04 -------
Created an attachment (id=20587)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20587&action=view)
ide-tape.dsm


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------- Comment #7 from koraq@xs4all.nl  2009-03-18 16:04 -------
Created an attachment (id=20588)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20588&action=view)
ide-tape.s


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--- Comment #8 from Borislav Petkov <bbpetkov@yahoo.de>  2009-03-25 08:40:31 ---
Created an attachment (id=20666)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20666)
debug patch

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--- Comment #9 from Borislav Petkov <bbpetkov@yahoo.de>  2009-03-25 08:42:07 ---
Hi,

can you apply the debug patch attached and send me the modprobe output again.
The patch is against stock 2.6.29 but it should apply fine against 2.6.29-rc7.

Thanks,
Boris.

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--- Comment #10 from Mark de Wever <koraq@xs4all.nl>  2009-03-30 20:20:36 ---
Created an attachment (id=20746)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20746)
2.6.29-rc7 modprobe output with debug patch

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--- Comment #11 from Borislav Petkov <bbpetkov@yahoo.de>  2009-03-31 08:08:25 ---
Created an attachment (id=20753)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20753)
temporary fix

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--- Comment #12 from Borislav Petkov <bbpetkov@yahoo.de>  2009-03-31 08:11:40 ---
Hi Mark,

here's a fix. Please do test and let me know whether it fixes your bug.

Thanks,
Boris.

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--- Comment #13 from Mark de Wever <koraq@xs4all.nl>  2009-04-05 10:42:58 ---
Created an attachment (id=20810)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20810)
modprobe with patch

I just tested with only the "temporary fix" patch patch applied and it didn't
help. Attached the dmesg output of modprobe.

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--- Comment #14 from Borislav Petkov <bbpetkov@yahoo.de>  2009-04-05 16:23:15 ---
Hi,

sorry, the patch was wrong. How about that one?

Thanks,
Boris.

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Borislav Petkov <bbpetkov@yahoo.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #20753|0                           |1
        is obsolete|                            |




--- Comment #15 from Borislav Petkov <bbpetkov@yahoo.de>  2009-04-05 16:24:20 ---
Created an attachment (id=20822)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20822)
tmp fix 2

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--- Comment #16 from Mark de Wever <koraq@xs4all.nl>  2009-04-05 20:45:56 ---
Created an attachment (id=20826)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20826)
modprobe with 'tmp fix 2' patch

I just tried the 'tmp fix 2' patch and the modprobe still fails, but with a
different backtrace and error.

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--- Comment #17 from Borislav Petkov <bbpetkov@yahoo.de>  2009-04-08 05:45:43 ---
Hi,

yeah, the driver is quite broken but no worries, we'll fix it :).

So, on to the next thing: If my analysis isn't completely wrong, we get a
divide-by-zero error because tape->buffer_size is somehow 0. I'd like to see
what capabilities your drive reports so please apply the following combo patch
ontop of the "tmp fix 2"-patch and please send me the _whole_ dmesg this time.

Thanks,
Boris.

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--- Comment #18 from Borislav Petkov <bbpetkov@yahoo.de>  2009-04-08 05:47:20 ---
Created an attachment (id=20873)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20873)
dump drive caps and dbg rqs

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--- Comment #19 from Mark de Wever <koraq@xs4all.nl>  2009-04-08 22:21:27 ---
Created an attachment (id=20892)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20892)
dmesg with patches 'tmp fix 2' + 'dump drive caps and dbg rqs'

As requested the complete dmesg output of booting and modprobe with the 'tmp
fix 2' + 'dump drive caps and dbg rqs' patches applied.

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Mark de Wever <koraq@xs4all.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #20892|application/octet-stream    |text/plain
          mime type|                            |




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--- Comment #20 from Borislav Petkov <bbpetkov@yahoo.de>  2009-04-10 10:06:04 ---
Hmm, seems like the buffer is quite botched or the drive replies with some mode
parameter headers I cannot correlate. Ok, let's now enable full debugging -
please apply the following patch ontop of the other two you have already
applied on your tree. This time you should expect more output so you should add
'log_buf_len=10M ignore_loglevel' to the kernel command line to make sure you
catch it all. And as always, please send me the whole output.

Thanks,
Boris.

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--- Comment #21 from Borislav Petkov <bbpetkov@yahoo.de>  2009-04-10 10:06:57 ---
Created an attachment (id=20917)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20917)
dump whole caps buffer

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--- Comment #22 from Borislav Petkov <bbpetkov@yahoo.de>  2009-04-10 10:14:18 ---
(From update of attachment 20917)
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index e9d042d..4ef3b7e 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -8,6 +8,8 @@
 #include <linux/ide.h>
 #include <scsi/scsi.h>

+#define DEBUG 1
+
 #ifdef DEBUG
 #define debug_log(fmt, args...) \
     printk(KERN_INFO "ide: " fmt, ## args)
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index aed280f..70e7876 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -59,7 +59,7 @@ enum {
 };

 /* define to see debug info */
-#define IDETAPE_DEBUG_LOG        0
+#define IDETAPE_DEBUG_LOG        1

 #if IDETAPE_DEBUG_LOG
 #define debug_log(lvl, fmt, args...)            \
@@ -720,9 +720,11 @@ static void idetape_create_mode_sense_cmd(struct
ide_atapi_pc *pc, u8 page_code)
     if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
         pc->req_xfer = 12;
     else if (page_code == IDETAPE_CAPABILITIES_PAGE)
-        pc->req_xfer = 24;
+        pc->req_xfer = IDE_PC_BUFFER_SIZE;
     else
         pc->req_xfer = 50;
+
+    memset(pc->pc_buf, 0xf, IDE_PC_BUFFER_SIZE);
 }

 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
@@ -2082,7 +2084,7 @@ static void idetape_get_mode_sense_results(ide_drive_t
*drive)
     struct ide_atapi_pc pc;
     u8 *caps;
     u8 speed, max_speed;
-    int i;
+    unsigned int i;

     idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
     if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
@@ -2097,8 +2099,11 @@ static void idetape_get_mode_sense_results(ide_drive_t
*drive)
     caps = pc.buf + 4 + pc.buf[3];

     printk(KERN_ERR "caps: ");
-    for (i = 0; i < 24; i++)
+    for (i = 0; i < IDE_PC_BUFFER_SIZE; i++) {
         printk(KERN_CONT " %x", pc.buf[i]);
+        if ((i & 0xf) == 0xf)
+            printk(KERN_CONT "\n");
+    }
     printk(KERN_CONT "\n");

     /* convert to host order and save for later use */
@@ -2207,6 +2212,7 @@ static void idetape_setup(ide_drive_t *drive,
idetape_tape_t *tape, int minor)
     drive->pc_callback     = ide_tape_callback;
     drive->pc_update_buffers = idetape_update_buffers;
     drive->pc_io_buffers     = ide_tape_io_buffers;
+    drive->debug_mask     = 0xffffffff;

     spin_lock_init(&tape->lock);

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Borislav Petkov <bbpetkov@yahoo.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #20917|0                           |1
        is obsolete|                            |




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--- Comment #23 from Borislav Petkov <bbpetkov@yahoo.de>  2009-04-10 10:16:30 ---
Created an attachment (id=20918)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20918)
dump whole caps buffer

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Sergei Shtylyov <sshtylyov@ru.mvista.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sshtylyov@ru.mvista.com




--- Comment #24 from Sergei Shtylyov <sshtylyov@ru.mvista.com>  2009-04-10 12:48:29 ---
(In reply to comment #20)
> Hmm, seems like the buffer is quite botched or the drive replies with some mode
> parameter headers I cannot correlate.

If you mean this line:

[   42.272638] caps:  70 0 6 0 0 0 0 a 0 0 0 0 29 0 0 0 0 0 0 0 0 0 0 0


this is the extended sense data with its characteristic 1st byte of 0x70,
8-byte header with sense key UNIT ATTENTION, 10 bytes of additinal length and
ASC of 0x29 meaning "reset hs occured".

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--- Comment #25 from Borislav Petkov <bbpetkov@yahoo.de>  2009-06-15 08:18:12 ---
Hi Mark,

can you please try 2.6.30 to see whether the problem still persists?

Thanks,
Boris.

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--- Comment #26 from Mark de Wever <koraq@xs4all.nl>  2009-06-18 18:02:54 ---
Hi Boris,

I didn't test before since I thought the fixes would be in 2.6.31-rc1.
I just tested 2.6.30 and the drive still causes an OOPS.
I'll test again after 2.6.31-rc1 is released and if it still crashes
I'll post a full dmesg and OOPS report.

Regards,
Mark

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--- Comment #27 from Borislav Petkov <bbpetkov@yahoo.de>  2009-06-18 21:15:38 ---
Hi Mark,

can you send the OOPS with 2.6.30?

Thanks,
Boris.

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--- Comment #28 from Mark de Wever <koraq@xs4all.nl>  2009-07-14 21:01:06 ---
I tried to get the OOPS but the system hung and I wasn't able to capture it.

I just tested with 2.6.31-rc3 which didn't OOPS, but files written to the
streamer were truncated when read. I hope to find some more time this
weekend to do some more testing and see whether there's a pattern in the
truncating. Just wanted to let you know to see whether it rings a bell.

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--- Comment #29 from Mark de Wever <koraq@xs4all.nl>  2009-07-19 13:21:54 ---
I just did some more testing by writing files of different sizes to the
streamer and reading them back. With the 2.6.24-debian kernel the files had the
same size before and after writing. With 2.6.31-rc3 they all return smaller as
written. I did three runs on 2.6.31-rc3 which all produced the same results.
The output of the attached script was:
0    30.copy
0    32.copy
30720    30
32768    32
55296    60.copy
55296    64.copy
61440    60
65536    64
110592    120.copy
110592    128.copy
122880    120
131072    128
221184    240.copy
221184    256.copy
245760    240
262144    256
442368    480.copy
491520    480
497664    512.copy
524288    512
940032    960.copy
983040    960
995328    1024.copy
1048576    1024

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[Bug 12874] Seagate STT20000A no longer works

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--- Comment #30 from Mark de Wever <koraq@xs4all.nl>  2009-07-19 13:22:59 ---
Created an attachment (id=22400)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22400)
test script to test reading and writing data to the streamer

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--- Comment #31 from Borislav Petkov <bbpetkov@yahoo.de>  2009-07-19 14:27:12 ---
Hi,

please send me that script and let me try to reproduce it here.

Thanks,
Boris.

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--- Comment #32 from Borislav Petkov <bbpetkov@yahoo.de>  2009-07-19 14:30:14 ---
Ah, too much in a hurry, as always. You've sent it already. Nevermind.

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--- Comment #33 from Borislav Petkov <bbpetkov@yahoo.de>  2009-08-15 08:02:27 ---
Created an attachment (id=22722)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22722)
disable DMA for RW commands

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--- Comment #34 from Borislav Petkov <bbpetkov@yahoo.de>  2009-08-15 08:04:05 ---
Hi Mark.

please try this patch to see whether it fixes your reported problem:
http://bugzilla.kernel.org/attachment.cgi?id=22722.

Thanks.

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--- Comment #35 from Mark de Wever <koraq@xs4all.nl>  2009-08-19 20:46:10 ---
Hi Boris,

I tried your patch and it makes no difference, the files are still truncated at
the same length.

Regards,
Mark

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Borislav Petkov <bbpetkov@yahoo.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #20666|0                           |1
        is obsolete|                            |




--- Comment #36 from Borislav Petkov <bbpetkov@yahoo.de>  2009-08-20 06:36:16 ---
Created an attachment (id=22782)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22782)
ide-tape enable debug for whole driver

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--- Comment #37 from Borislav Petkov <bbpetkov@yahoo.de>  2009-08-20 06:41:10 ---
Hi Mark,

ok, we have to wheel out the heavy guns. In ide-next I've got an
ide-tape debugging patch for the whole driver. Get the tree at
git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-next-2.6.git and
apply the patch at http://bugzilla.kernel.org/attachment.cgi?id=22782
and catch the _whole_ output while doing only one filesize, let's say:

cat /tmp/32 >/dev/ht0
cat /dev/ht0 > /tmp/32.copy


Try setting log_buf_len=10M kernel parameter in case the output gets
truncated since it is quite a lot.

Thanks.

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--- Comment #38 from Mark de Wever <koraq@xs4all.nl>  2009-08-31 18:22:04 ---
Created an attachment (id=22933)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22933)
dmesg after running the test

I ran the test with kernel 2.6.31-rc8, pulling linux-next and your patch.
Attached the dmesg output after running it with the 32Kb file (32.copy was
still zero bytes).

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Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alan@lxorguk.ukuu.org.uk
     Kernel Version|2.6.29-rc7                  |2.6.32




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