New: Cannot read CD: "Logical unit communication CRC error"
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: [email protected]
ReportedBy: [email protected]
Regression: YesI 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"
http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #1 from checkit <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
Robert Hancock <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #2 from Robert Hancock <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #3 from checkit <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #4 from checkit <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
Alan <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #5 from Alan <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
checkit <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #22547|dmesg.txt |dmesg 2.6.30.03.txt
filename| |Signature · 3 lines
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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
checkit <[email protected]> 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| |Signature · 3 lines
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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #6 from checkit <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #7 from checkit <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
checkit <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #22547|dmesg 2.6.30.03 |dmesg 2.6.30.3
description| |Signature · 3 lines
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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #8 from checkit <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #9 from Robert Hancock <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
checkit <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #22556|0 |1
is obsolete| |
--- Comment #10 from checkit <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
checkit <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #22555|0 |1
is obsolete| |
--- Comment #11 from checkit <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #12 from checkit <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #13 from Robert Hancock <[email protected]> 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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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #14 from Robert Hancock <[email protected]> 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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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #15 from Alan <[email protected]> 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"
--- Comment #15 from Alan <[email protected]> 2009-08-01 21:30:26 ---
Quoted 4 lines
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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #16 from Sergei Shtylyov <[email protected]> 2009-08-01 22:06:00 --- --- Comment #15 from Alan <[email protected]> 2009-08-01 21:30:26 ---
Quoted 4 lines
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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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #17 from Alan <[email protected]> 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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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #18 from checkit <[email protected]> 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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[Bug 13882] Cannot read CD: "Logical unit communication CRC error"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #19 from Alan <[email protected]> 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"
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=13882
--- Comment #20 from checkit <[email protected]> 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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