New: Seagate STT20000A no longer works

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: [email protected]
        ReportedBy: [email protected]

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 [email protected] 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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[email protected] changed:

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----------------------------------------------------------------------------

         Regression|0                           |1

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------- Comment #2 from [email protected] 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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------- Comment #3 from [email protected] 2009-03-15 03:18 ------- (In reply to comment #1)

--> (http://bugzilla.kernel.org/attachment.cgi?id=20526&action=view) [details]

(In reply to comment #2)

--> (http://bugzilla.kernel.org/attachment.cgi?id=20527&action=view) [details]

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

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[email protected] changed:

What |Removed |Added
----------------------------------------------------------------------------

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

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[email protected] changed:

What |Removed |Added
----------------------------------------------------------------------------

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

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------- Comment #4 from [email protected] 2009-03-15 03:40 ------- (In reply to comment #3)

--> (http://bugzilla.kernel.org/attachment.cgi?id=20526&action=view) [details] [details]

--> (http://bugzilla.kernel.org/attachment.cgi?id=20527&action=view) [details] [details]

Sorry I assumed the autodetection of bugzilla would set the proper type. Changed it now.

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[email protected] changed:

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CC| |[email protected]

------- Comment #5 from [email protected] 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 [email protected] 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 [email protected] 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 2009-04-05 16:23:15 --- Hi,

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

Thanks,
Boris.

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Borislav Petkov <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

  Attachment #20753|0                           |1

is obsolete| |

--- Comment #15 from Borislav Petkov <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

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

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--- Comment #20 from Borislav Petkov <[email protected]> 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 <[email protected]> 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 <[email protected]> 2009-04-10 10:14:18 --- (From update of attachment 20917)

index e9d042d..4ef3b7e 100644
@@ -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)

index aed280f..70e7876 100644
@@ -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 <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

  Attachment #20917|0                           |1

is obsolete| |

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--- Comment #23 from Borislav Petkov <[email protected]> 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 <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]

--- Comment #24 from Sergei Shtylyov <[email protected]> 2009-04-10 12:48:29 --- (In reply to comment #20)

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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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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--- Comment #30 from Mark de Wever <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

  Attachment #20666|0                           |1

is obsolete| |

--- Comment #36 from Borislav Petkov <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

                 CC|                            |[email protected]
     Kernel Version|2.6.29-rc7                  |2.6.32

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