[Bug 13882] New: Cannot read CD: "Logical unit communication CRC error"

[Bug 13882] New: Cannot read CD: "Logical unit communication CRC error"

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=13882

           Summary: Cannot read CD: "Logical unit communication CRC error"
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 2.6.27.10
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: IDE
        AssignedTo: io_ide@kernel-bugs.osdl.org
        ReportedBy: python.dev.9@gmail.com
        Regression: Yes


I have an official Ubuntu 9.04 (Jaunty) CD ordered using the Ubuntu ShipIt
service.  I put the disc in my DVD drive and attempt to validate the contents
of the CD using the following command:

md5sum -c md5sum.txt | grep -vi 'OK$'

This returns the following error message in the terminal:

md5sum: ./casper/filesystem.squashfs: Input/output error
./casper/filesystem.squashfs: FAILED open or read
md5sum: WARNING: 1 of 65 listed files could not be read

Opening /var/log/messages in a text editor shows the following:

Jul 30 18:12:23 phoenix kernel: [  724.994491] UDF-fs: No VRS found
Jul 30 18:12:23 phoenix kernel: [  724.994500] UDF-fs: No partition found (1)
Jul 30 18:13:12 phoenix kernel: [  773.810949] sr 1:0:1:0: [sr0] Unhandled
sense code
Jul 30 18:13:12 phoenix kernel: [  773.810958] sr 1:0:1:0: [sr0] Result:
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Jul 30 18:13:12 phoenix kernel: [  773.810964] sr 1:0:1:0: [sr0] Sense Key :
Hardware Error [current] 
Jul 30 18:13:12 phoenix kernel: [  773.810971] sr 1:0:1:0: [sr0] Add. Sense:
Logical unit communication CRC error (Ultra-DMA/32)

The earliest kernel I have found that reproduces this bug is 2.6.27.10.
The latest kernel I have found that works as expected is 2.6.24.6.
This bug is reproducible using the latest stable kernel (2.6.30.3).

All these tests were conducted on a Ubuntu 8.10 (Intrepid) system, and all
kernel versions specified are mainline kernels (not Ubuntu distributed kernels)
installed using the instructions at
https://wiki.ubuntu.com/KernelTeam/MainlineBuilds.

The DVD drive used is a Lite-On 201AH DVDRW, firmware revision LL0D.  This is
an IDE drive.

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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http://bugzilla.kernel.org/show_bug.cgi?id=13882





--- Comment #1 from checkit <python.dev.9@gmail.com>  2009-07-30 22:53:43 ---
Created an attachment (id=22547)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22547)
dmesg output

Attaching dmesg output.

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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http://bugzilla.kernel.org/show_bug.cgi?id=13882


Robert Hancock <hancockrwd@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hancockrwd@gmail.com




--- Comment #2 from Robert Hancock <hancockrwd@gmail.com>  2009-07-31 02:39:41 ---
It looks like you're indeed getting UDMA CRC errors. The drive is getting
configured for UDMA/66. Is it using an 80-wire PATA cable? If not then that
would explain why as 40-wire are only good to UDMA/33, however in that case it
would point to the cable detection not working properly.

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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--- Comment #3 from checkit <python.dev.9@gmail.com>  2009-07-31 12:51:31 ---
ata1 is using an 80-wire cable, and ata2 is using a 40-wire cable.  So I think
you are right about cable detection not working properly.

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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--- Comment #4 from checkit <python.dev.9@gmail.com>  2009-07-31 13:16:31 ---
Created an attachment (id=22551)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22551)
dmesg 2.6.24.6

Here is the dmesg output using 2.6.24.6.

As you can see it detects the 40-wire cable properly.

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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http://bugzilla.kernel.org/show_bug.cgi?id=13882


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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alan@lxorguk.ukuu.org.uk




--- Comment #5 from Alan <alan@lxorguk.ukuu.org.uk>  2009-07-31 15:22:02 ---
Can you attach an lspci -vvxx

Would also be useful to know if 2.6.29/30 get it right

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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checkit <python.dev.9@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #22547|dmesg.txt                   |dmesg 2.6.30.03.txt
           filename|                            |




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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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http://bugzilla.kernel.org/show_bug.cgi?id=13882


checkit <python.dev.9@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #22547|dmesg output                |dmesg 2.6.30.03
        description|                            |
  Attachment #22547|dmesg 2.6.30.03.txt         |dmesg.txt
           filename|                            |




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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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http://bugzilla.kernel.org/show_bug.cgi?id=13882





--- Comment #6 from checkit <python.dev.9@gmail.com>  2009-07-31 18:42:34 ---
Created an attachment (id=22555)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22555)
lspci -vvxxx 2.6.24.6

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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http://bugzilla.kernel.org/show_bug.cgi?id=13882





--- Comment #7 from checkit <python.dev.9@gmail.com>  2009-07-31 18:43:39 ---
Created an attachment (id=22556)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22556)
lspci -vvxxx 2.6.30.3

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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http://bugzilla.kernel.org/show_bug.cgi?id=13882


checkit <python.dev.9@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #22547|dmesg 2.6.30.03             |dmesg 2.6.30.3
        description|                            |




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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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--- Comment #8 from checkit <python.dev.9@gmail.com>  2009-07-31 18:48:14 ---
Alan, I'm not sure what you mean by "Would also be useful to know if 2.6.29/30
get it right".  If you are asking whether or not the bug occurs in 2.6.29/30,
then the answer is yes (as can be verified by looking at dmesg 2.6.30.3).

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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--- Comment #9 from Robert Hancock <hancockrwd@gmail.com>  2009-07-31 18:49:15 ---
Can you rerun the lspci output for 2.6.30 as root? When run as normal user it
omits the part of the PCI configuration space that contains the cable detection
bits.

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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http://bugzilla.kernel.org/show_bug.cgi?id=13882


checkit <python.dev.9@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #22556|0                           |1
        is obsolete|                            |




--- Comment #10 from checkit <python.dev.9@gmail.com>  2009-07-31 18:57:03 ---
Created an attachment (id=22557)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22557)
lspci -vvxxx 2.6.30.3

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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checkit <python.dev.9@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #22555|0                           |1
        is obsolete|                            |




--- Comment #11 from checkit <python.dev.9@gmail.com>  2009-07-31 18:57:43 ---
Created an attachment (id=22558)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22558)
lspci -vvxxx 2.6.24.6

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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--- Comment #12 from checkit <python.dev.9@gmail.com>  2009-07-31 18:58:41 ---
Ok Robert, I have rerun both lspci outputs as root.

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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--- Comment #13 from Robert Hancock <hancockrwd@gmail.com>  2009-07-31 20:07:16 ---
Presumably it's hitting this case:

    pci_read_config_dword(pdev, 0x50, &ata66);
    /* Check both the drive cable reporting bits, we might not have
       two drives */
    if (ata66 & (0x10100000 >> (16 * ap->port_no)))
        return ATA_CBL_PATA80;

The value at 0x50 is F1F1F6F2, which according to this logic means that an
80-wire cable is detected on all 4 drives. Hmm..

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--- Comment #14 from Robert Hancock <hancockrwd@gmail.com>  2009-08-01 18:40:24 ---
Alan, do you have access to any documentation that indicates what those bits
are supposed to actually mean?

For the original reporter, you can try just deleting those lines from
drivers/ata/pata_via.c and see if the cable detection then reports 40-wire..

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--- Comment #15 from Alan <alan@lxorguk.ukuu.org.uk>  2009-08-01 21:30:26 ---
I have complete documentation for them. They are set by the BIOS to indicate
whether the cable is 40 or 80 wire. We cannot do drive side detect as there is
no guarantee the boards support it.

If the system supports ACPI we also check the ACPI data. There isn't much else
we can do and unfortunately the ACPI tells us "80 wire or dunno" not 80/40 so I
don't see a good way to use that for both.


The other bits in that register pertain to mode/timing stuff.

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Re: [Bug 13882] Cannot read CD: "Logical unit communication CRC error"

[Sergei Shtylyov]

--- Comment #15 from Alan <alan@lxorguk.ukuu.org.uk> 2009-08-01 21:30:26 ---
> I have complete documentation for them. They are set by the BIOS to indicate
> whether the cable is 40 or 80 wire. We cannot do drive side detect as there is
> no guarantee the boards support it.
>   

I wonder how boards can support (or not) *drive side* cable detection...

[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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http://bugzilla.kernel.org/show_bug.cgi?id=13882





--- Comment #16 from Sergei Shtylyov <sshtylyov@ru.mvista.com>  2009-08-01 22:06:00 ---
--- Comment #15 from Alan <alan@lxorguk.ukuu.org.uk> 2009-08-01 21:30:26 ---
> I have complete documentation for them. They are set by the BIOS to indicate
> whether the cable is 40 or 80 wire. We cannot do drive side detect as there is
> no guarantee the boards support it.
>   

I wonder how boards can support (or not) *drive side* cable detection...

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--- Comment #17 from Alan <alan@lxorguk.ukuu.org.uk>  2009-08-02 10:53:01 ---
Because someone didn't bother fitting a suitable capacitor I would imagine (ATA
5 AnnexB). It may also be the boot process before Linux runs (eg ACPI) samples
and confuses stuff. Neither the VIA nor the Nvidia reliabily support drive side
detect and Nvidia in fact specify the use of ACPI for detection purposes should
always be done.

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--- Comment #18 from checkit <python.dev.9@gmail.com>  2009-08-03 21:24:33 ---
How does 2.6.24.6 detect the cables correctly?  Does it not use ACPI?

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--- Comment #19 from Alan <alan@lxorguk.ukuu.org.uk>  2009-08-03 21:49:31 ---
2.6.24 has various differences, without knowing exactly what path is taken it's
hard to tell. Most likely the fact the old code erroneously also checked drvie
detect on VIA (which broke lots of systems) happened by luck to make yours
work.

One way to test that would be to make the cases which return ATA_CBL_PATA80 in
the pata_via driver return ATA_CBL_PATA_UNK and see if that helps you. If it
does we are probably going to have to special case some boards by PCI svid/sdid
8(

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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--- Comment #20 from checkit <python.dev.9@gmail.com>  2009-08-09 22:41:14 ---
I just replaced my 40-wire cable with an 80-wire cable, reran the md5sum test
using 2.6.27.14, and it looks like my DVD drive is working fine now.

I don't have the inclination to spend any more time on the original bug. 
Perhaps somebody else with more time and inclination will want to look into
this further.

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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED




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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WILL_NOT_FIX




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