2.4.20-pre10-ac2: i/o error on cdrom diskdump

More clues please (h/w, error, command, etc.)

Hello All,

Whenever I try to dd a cdrom to an iso image I get an I/O error. This problem has been present for some time, and I don't know if it's because I use ide-scsi or not (not been able to test).

Is this still an open issue, and is it likely to get fixed before 2.4.20 final?

Thanks!

DK

New York's got the ways and means;
Just won't let you be.
		-- The Grateful Dead

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Kernel: 2.4.20-pre10-ac2. Configuration is attached. Hardware platform: x86, AMD TBird 2000XP.

Details: the scsi cdrom (writer) fails to read the immage correctly, whereas the other two (ide-scsi) devices read the image perfectly.

Loaded modules:
--------------------

agpgart   es1371  ac97_codec  soundcore  usb-storage  usb-uhci  usbcore  
via686a  i2c-isa  i2c-viapro  i2c-proc  i2c-core  ide-scsi  aic7xxx   sg  

sr_mod cdrom sd_mod scsi_mod smbfs nfs lockd sunrpc loop lp parport_pc parport rtc 3c59x

SCSI Controller
----------------
00:0f.0 SCSI storage controller: Adaptec AHA-7850 (rev 03)
Subsystem: Adaptec AHA-2904/Integrated AIC-7850
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (1000ns min, 1000ns max), cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at e800 [disabled] [size=256] Region 1: Memory at fb002000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

CDROM device:
------------------
scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.8

        <Adaptec 2902/04/10/15/20/30C SCSI adapter>
        aic7850: Single Channel A, SCSI Id=7, 3/253 SCBs

Vendor: PLEXTOR Model: CD-R PX-W4220T Rev: 1.01
Type: CD-ROM ANSI SCSI revision: 02
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 4, lun 0 (scsi0:A:4): 10.000MB/s transfers (10.000MHz, offset 8)
sr0: scsi3-mmc drive: 20x/20x writer cd/rw xa/form2 cdda tray

Device file:
-------------

devilkin@whocares:/tmp$ ls -l /dev/scd0
brw-rw-rw-    1 root     disk      11,   0 Jul 18  1994 /dev/scd0

Command executed with valid cdrom in drive:
---------------------------------------------------

devilkin@whocares:/tmp$ dd if=/dev/scd0 of=/tmp/image.iso
dd: reading `/dev/writer': Input/output error
1264984+0 records in
1264984+0 records out

Errors in the system log:
---------------------------
scsi0: ERROR on channel 0, id 4, lun 0, CDB: Read (10) 00 00 04 d3 24 00 00 3f 00
Info fld=0x4d356, Current sd0b:00: sense key Medium Error Additional sense indicates L-EC uncorrectable error
I/O error: dev 0b:00, sector 1264984
scsi0: ERROR on channel 0, id 4, lun 0, CDB: Read (10) 00 00 04 d3 57 00 00 0c 00
Info fld=0x4d357, Current sd0b:00: sense key Medium Error
I/O error: dev 0b:00, sector 1264988
scsi0: ERROR on channel 0, id 4, lun 0, CDB: Read (10) 00 00 04 d3 58 00 00 0b 00
Info fld=0x4d358, Current sd0b:00: sense key Medium Error
I/O error: dev 0b:00, sector 1264992
scsi0: ERROR on channel 0, id 4, lun 0, CDB: Read (10) 00 00 04 d3 56 00 00 01 00
Info fld=0x4d356, Current sd0b:00: sense key Medium Error Additional sense indicates L-EC uncorrectable error
I/O error: dev 0b:00, sector 1264984
scsi0: ERROR on channel 0, id 4, lun 0, CDB: Read (10) 00 00 04 d3 57 00 00 01 00
Info fld=0x4d357, Current sd0b:00: sense key Medium Error
I/O error: dev 0b:00, sector 1264988

This happens with close to EVERY cdrom, and I can always read them perfectly in the other drives. Just doing a file-copy from the disk in the scsi drive also works. Writing also gives no problems at all.

Strange things are afoot...

DK

Bradley's Bromide:
	If computers get too powerful, we can organize them into a
committee -- that will do them in.