IDE/SCSI emulation kills machine when using CD-Rom.

Graham TerMarsch (gtermars@home.com)
Tue, 15 Dec 1998 12:43:41 -0800

Perhaps someone else out there in the enlightened world of Linux Kernel
development can help me figure this one out. I've got 2 CD-Roms installed in
this machine right now; a Toshiba XM-6202B and a Panasonic CW-7582 Writer.
I've managed to get the IDE/SCSI driver working, and can access the Panasonic
writer beautifully, works like a charm. However, whenever I try to do
anything with the Toshiba drive mount or read raw data, it kills the machine.
Playing audio CDs works fine in the Toshiba, but I can't access it as a CD-Rom
any more. Yes, I've tried accessing it as any combination of /dev/hdb, sg0,
sr0, scd0 and none of them worked. I do end up with the following information
dumped into my /var/log/messages file, I'm hoping someone can help me figure
out why this thing isn't working any more (it works fine if I recompiled
_without_ ide-scsi emulation). Currently running 2.1.131-ac11, but have had
this problem on all kernels since 2.1.28 (which was the first kernel I ever
tried running ide-scsi on).

As for other info on this machine, it's a K6 233Mhz, running on an Asus P5A-B
motherboard. I've also got the ALI15x3 UDMA patch installed, and have
/dev/hda running in UDMA mode. Toshiba used to be /dev/hdb, and the Panasonic
writer used to be /dev/hdc.

sr0: disc change detected.
scsi : aborting command due to timeout : pid 408, scsi0, channel 0,
id 0, lun 0 0x28 00 00 00 00 10 00 00 01 00
hdb: timeout waiting for DMA
hdb: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
hdb: DMA disabled
hdb: ATAPI reset complete
hdb: irq timeout: status=0xc0 { Busy }
scsi : aborting command due to timeout : pid 408, scsi0, channel 0,
id 0, lun 0 0x28 00 00 00 00 10 00 00 01 00
SCSI host 0 abort (pid 408) timed out - resetting
SCSI bus is being reset for host 0 channel 0.
hdb: ATAPI reset timed-out, status=0xd0
hda: DMA disabled
ide0: reset: success
hdb: irq timeout: status=0xc0 { Busy }
hdb: status timeout: status=0xd0 { Busy }
hdb: drive not ready for command
hdb: ATAPI reset complete
SCSI CD error : host 0 id 0 lun 0 return code = 27000002
extra data not valid Current error sr0b:00: sns = 70 0
Raw sense data:0x70 0x00 0x00 0x00 0x00 0x00 0x00 0x0a
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
CD-ROM I/O error: dev 0b:00, sector 64
isofs_read_super: bread failed, dev=0b:00, iso_blknum=16, block=16
kmem_free: Either bad obj addr or double free (objp=c037b4c4, name=size-512) 

-- 
Graham TerMarsch


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