I am having SCSI problems with NetBSD 1.6.1_RC2.  Below is the kernel messages 
output.  This gets repeated with minor differences.  After a while it panics 
but it doesn't seem to create a crash file.  This is with an Intel 
motherboard with dual SCSI controllers onboard.  It was running fine for a 
year (and for a few weeks with RC2) and then we added a second disk and 
started having this problem.

I have moved the second disk to another machine where I am NFS mounting it 
from but I wonder if someone who knows SCSI better knows where to start 
looking for this problem.  I would like to move the disk to the local system 
again if I can.

sd1(ahc0:0:1:0): command aborted, data = 00 00 00 00 4e 00 01 00 00 00
sd0(ahc0:0:0:0): SCB 1 - timed out while idle, SEQADDR == 0xb
SCSIRATE == 0x0
sd0(ahc0:0:0:0): Queuing a BDR SCB
ahc0: WARNING no command for scb 1 (cmdcmplt)
QOUTPOS = 32
sd0(ahc0:0:0:0): SCB 1 - timed out while idle, SEQADDR == 0x9
SCSIRATE == 0x0
sd0(ahc0:0:0:0): no longer in timeout, status = 0
sd0: async, 8-bit transfers, tagged queueing
sd1: async, 8-bit transfers, tagged queueing
ahc0: Issued Channel A Bus Reset. 15 SCBs aborted
sd0: sync (25.0ns offset 63), 16-bit (80.000MB/s) transfers, tagged queueing
sd1: sync (25.0ns offset 63), 16-bit (80.000MB/s) transfers, tagged queueing
ahc0:A:1: ahc_intr - referenced scb not valid during seqint 0x71 scb(1)
ahc0: WARNING no command for scb 1 (cmdcmplt)
QOUTPOS = 1

-- 
D'Arcy J.M. Cain <darcy@netbsd.org>
http://www.NetBSD.org/