scsi drivers are indeed broken...

http://www.macfixit.com/article.php?...50506072636260
Possible fix for some SCSI-related problems As noted over the past few days, Mac OS X 10.4 (Tiger) appears to have some serious issues with SCSI expansion cards and drives in some system configurations. In some cases, the presence of certain SCSI PCI cards can cause kernel panics, startup problems, and other issues.