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Subject[Bug 1156] New: Loose IRQ or fail SCSI Commands under heavy I/O

Summary: Loose IRQ or fail SCSI Commands under heavy I/O
Kernel Version: 2.6.0-test2 and test 3
Status: NEW
Severity: high

Distribution: Debian Testing

Hardware Environment: PIII 1 Gz on Intel 815ae2 mainboard
Software Environment: cdrecord or standard GNU commands
Problem Description: Under heavy I/O performance lags and one of the devices
(it changes every time) will loose it's IRQ. Sometimes the operation will
continue, sometimes it will seg fault and every once in a while it will lock
the PC, hard. When using SCSI emulation to a cd-rw drive cdrecord simply seg
faults. When I reboot to 2.4.21 SCSI emulation works perfect. I have swapped
out burners and tested on an Asus A7N8X based system with the same results.

Steps to reproduce:

Compile 2.6.0-test2 or 3 w/ SCSI emulation and appropriate support for hardware.
Copy large amounts of data, 1 GB or more, from one drive to another, wait for
IRQ to drop and lock-up the system or stop the transfer. Or merely attempt to
burn a CD, it fails 2 out of 3 when burning CDs. Both problems are very

Device seems to be: Generic mmc CD-RW.
Current: 0x0002
Profile: 0x000A
Profile: 0x0009
Profile: 0x0008
Profile: 0x0002 (current)
Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr).
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
FIFO size : 4194304 = 4096 KB
Track 01: data 404 MB
Total size: 464 MB (46:00.98) = 207074 sectors
Lout start: 464 MB (46:02/74) = 207074 sectors
cdrecord: Input/output error. test unit ready: scsi sendcmd: no error
Segmentation Fault

I cannot post a copy of the IRQ failure becuase it's lock-up every time now.

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