The subject kind of says it all.

My AHA2940 has been stopping the system completely cold!  The SCSI drive
select light is on solid.

The same setup has worked for over a year non-stop, now, suddenly in the
past month (since I loaded my first attempt at 1.3-release) the system
has been locking like this.  Thinking it might be the external SCSI
cable to the tape drive, I disconnected the external cable and reset the
drive termination from 'none' to 'automatic'.

The drive is locked up now.  It's not going anywhere until I power cycle
the machine in the morning.  When I do, there will be no core dump, no
indication that anything odd happened, except the drive will all need to
be cleaned.  I've even tried blowing away the /usr/src/sys tree and 
reloading the 1.3 sources from the NetBSD archive (in case I got a bad
file from sup).

It didn't help.  

Anyone?

Particulars (from the SDMF, running the same vintage sources)

NetBSD cynjut.neonramp.com 1.3 NetBSD 1.3 (CYNJUT) #1: Mon Jan 19 16:21:53 CST 1998     root@cynjut.neonramp.com:/usr/src/sys/arch/i386/compile/CYNJUT i386

Here's the config file (it should look familiar, I enabled wdc0 support):

#	$NetBSD: HOMEWORLD,v 1.21.2.2 1997/11/28 08:19:05 mellon Exp $
#
#	HOMEWORLD - Mail, CVS, and GNATS server
#

include "arch/i386/conf/std.i386"

#options 	I386_CPU	# CPU classes; at least one is REQUIRED
options 	I486_CPU
options 	I586_CPU
#options 	I686_CPU
#options 	MATH_EMULATE	# floating point emulation
#options 	VM86		# virtual 8086 emulation
#options 	USER_LDT	# user-settable LDT; used by WINE

# The following options override the memory sizes passed in from the boot
# block.  Use them *only* if the boot block is unable to determine the correct
# values.  Note that the BIOS may *correctly* report less that 640k of base
# memory if the extended BIOS data area is located at the top of base memory
# (as is the case on most recent systems).
#options 	REALBASEMEM=...	# size of base memory
#options 	REALEXTMEM=...	# size of extended memory

options 	DUMMY_NOPS	# speed hack; recommended
#options 	XSERVER,UCONSOLE
#options 	INSECURE	# insecure; allow /dev/mem writing for X

maxusers	32		# estimated number of users
options 	RTC_OFFSET=0	# hardware clock is this many mins. west of GMT
#options 	NTP		# NTP phase/frequency locked loop

#options 	DDB		# in-kernel debugger
#makeoptions	DEBUG="-g"	# compile full symbol table
#options 	DIAGNOSTIC	# internal consistency checks
options 	KTRACE		# system call tracing, a la ktrace(1)

#options 	SYSVMSG		# System V-like message queues
#options 	SYSVSEM		# System V-like semaphores
#options 	SYSVSHM		# System V-like memory sharing
#options 	SHMMAXPGS=1024	# 1024 pages is the default

options 	COMPAT_NOMID	# compatibility with 386BSD, BSDI, NetBSD 0.8,
options 	COMPAT_09	# NetBSD 0.9,
options 	COMPAT_10	# NetBSD 1.0,
options 	COMPAT_11	# NetBSD 1.1,
options 	COMPAT_12	# NetBSD 1.2,
options 	COMPAT_43	# and 4.3BSD
options 	TCP_COMPAT_42	# TCP bug compatibility with 4.2BSD

#options 	COMPAT_SVR4	# binary compatibility with SVR4
#options 	COMPAT_IBCS2	# binary compatibility with SCO and ISC
#options 	COMPAT_LINUX	# binary compatibility with Linux
#options 	COMPAT_FREEBSD	# binary compatibility with FreeBSD

#options 	EXEC_ELF32	# 32-bit ELF executables (SVR4, Linux)

#options 	LKM		# loadable kernel modules

file-system 	FFS		# UFS
file-system 	NFS		# Network File System client
#file-system 	LFS		# log-structured file system
file-system 	MFS		# memory file system
file-system 	CD9660		# ISO 9660 + Rock Ridge file system
file-system 	MSDOSFS		# MS-DOS file system
file-system 	FDESC		# /dev/fd
file-system 	KERNFS		# /kern
#file-system 	NULLFS		# loopback file system
#file-system 	PORTAL		# portal filesystem (still experimental)
file-system 	PROCFS		# /proc
#file-system 	UMAPFS		# NULLFS + uid and gid remapping
#file-system 	UNION		# union file system

options 	QUOTA		# UFS quotas
options 	NFSSERVER	# Network File System server
options 	FIFO		# FIFOs; RECOMMENDED

#options 	GATEWAY		# packet forwarding
options 	INET		# IP + ICMP + TCP + UDP
options 	MROUTING	# IP multicast routing
#options 	NS		# XNS
#options 	NSIP		# XNS tunneling over IP
#options 	ISO,TPIP	# OSI
#options 	EON		# OSI tunneling over IP
#options 	CCITT,LLC,HDLC	# X.25
options 	PFIL_HOOKS	# pfil(9) packet filter hooks
options 	IPFILTER_LOG	#   and logging

# Compatibility with 4.2BSD implementation of TCP/IP.  Not recommended.

# Busy server; bump these up
options 	NKMEMCLUSTERS=2048	# slots in kmem_map
options 	NMBCLUSTERS=1024	# slots in mb_map

config		netbsd	root on sd0a type ffs
#options 	COMCONSOLE=0,CONADDR=0x3f8,CONUNIT=0,CONSPEED=9600

#options 	EISAVERBOSE	# verbose EISA device messages
options 	PCIVERBOSE	# verbose PCI device messages

mainbus0 at root

pci0	at mainbus0 bus ?
#eisa0	at mainbus0

#ppb*	at pci? dev ? function ?	# PCI-PCI bridges
#pci*	at ppb? bus ?
pchb*	at pci? dev ? function ?	# PCI-Host bridges
pcib*	at pci? dev ? function ?	# PCI-ISA bridges

isa*	at pcib?			# ISA on PCI-ISA bridge
isa*	at mainbus0			# all other ISA

#apm0	at mainbus0			# Advanced power management

npx0	at isa? port 0xf0 irq 13	# math coprocessor

pc0	at isa? port 0x60 irq 1		# generic PC console device
#vt0	at isa? port 0x60 irq 1

#com0	at isa? port 0x3f8 irq 4	# standard PC serial ports
#com1	at isa? port 0x2f8 irq 3
#com2	at isa? port 0x3e8 irq 5
#com3	at isa? port 0x2e8 irq 9
#ast0	at isa? port 0x1a0 irq 5	# AST 4-port serial cards
#com*	at ast? slave ?
#boca0	at isa? port 0x100 irq 5	# BOCA 8-port serial cards
#com*	at boca? slave ?
#rtfps0	at isa? port 0x1230 irq 10	# RT 4-port serial cards
#com*	at rtfps? slave ?
#cy0	at isa? iomem 0xd4000 irq 12	# Cyclades serial cards
#cy*	at pci? dev ? function ?	# Cyclades serial cards
  
#lpt0	at isa? port 0x378 irq 7	# standard PC parallel ports
#lpt1	at isa? port 0x278
#lpt2	at isa? port 0x3bc

#lms0	at isa? port 0x23c irq 5	# Logitech bus mouse
#lms1	at isa? port 0x238 irq 5
#mms0	at isa? port 0x23c irq 5	# Microsoft InPort mouse
#mms1	at isa? port 0x238 irq 5
#pms0	at pckbd? irq 12		# PS/2 auxiliary port mouse

aha0	at isa? port 0x330 irq ? drq ?	# Adaptec 154[02] SCSI controllers
aha1	at isa? port 0x334 irq ? drq ?	# Adaptec 154[02] SCSI controllers
scsibus* at aha?
#ahb*	at eisa? slot ?			# Adaptec 174[024] SCSI controllers
#scsibus* at ahb?
ahc0	at isa? port ? irq ?		# Adaptec 284x SCSI controllers
#ahc*	at eisa? slot ?			# Adaptec 274x, aic7770 SCSI controllers
ahc*	at pci? dev ? function ?	# Adaptec [23]94x, aic78x0 SCSI controllers
scsibus* at ahc?
#aic0	at isa? port 0x340 irq 11	# Adaptec 152[02] SCSI controllers
#scsibus* at aic?
#bha0	at isa? port 0x330 irq ? drq ?	# BusLogic [57]4X SCSI controllers
#bha1	at isa? port 0x334 irq ? drq ?	# BusLogic [57]4X SCSI controllers
#bha*	at eisa? slot ?
#bha*	at pci? dev ? function ?
#scsibus* at bha?
#ncr*	at pci? dev ? function ?	# NCR 538XX SCSI controllers
#scsibus* at ncr?
#sea0	at isa? iomem 0xc8000 irq 5
#scsibus* at sea?
#uha0	at isa? port 0x330 irq ? drq ?	# UltraStor [13]4f SCSI controllers
#uha1	at isa? port 0x334 irq ? drq ?	# UltraStor [13]4f SCSI controllers
#uha*	at eisa? slot ?			# UltraStor 24f SCSI controllers
#scsibus* at uha?
#wds0	at isa? port 0x350 irq 15 drq 6	# WD7000 and TMC-7000 controllers
#wds1	at isa? port 0x358 irq 11 drq 5
#scsibus* at wds?
#isp*	at pci? dev ? function ?	# Qlogic ISP 10x0 SCSI controllers
#scsibus* at isp?

sd*	at scsibus? target ? lun ?	# SCSI disk drives
st*	at scsibus? target ? lun ?	# SCSI tape drives
cd*	at scsibus? target ? lun ?	# SCSI CD-ROM drives
ch*	at scsibus? target ? lun ?	# SCSI autochangers
#ss*	at scsibus? target ? lun ?	# SCSI scanners
#uk*	at scsibus? target ? lun ?	# SCSI unknown

#fdc0	at isa? port 0x3f0 irq 6 drq 2	# standard PC floppy controllers
#fdc1	at isa? port 0x370 irq ? drq ?
#fd*	at fdc? drive ?

#mcd0	at isa? port 0x300 irq 10	# Mitsumi CD-ROM drives

wdc0	at isa? port 0x1f0 irq 14	# ST506, ESDI, and IDE controllers
wdc1	at isa? port 0x170 irq 15
wd*	at wdc? drive ?

# ATAPI bus support
atapibus* at wdc?

# ATAPI devices
cd*	at atapibus? drive ?		# ATAPI CD-ROM drives

ne0	at isa? port 0x280 irq 9		# NE[12]000 ethernet cards
ne1	at isa? port 0x300 irq 10

#eg0	at isa? ...				# 3C505 ethernet cards
#el0	at isa? port 0x300 irq 9		# 3C501 ethernet cards
#ep0	at isa? port ? irq ?			# 3C509 ethernet cards
#ie0	at isa? port 0x360 iomem 0xd0000 irq 7	# StarLAN and 3C507
#ie1	at isa? port 0x300 irq 10		# EtherExpress
#le0	at isa? port 0x320 irq 10 drq 7		# IsoLan, NE2100, and DEPCA
#ep*	at eisa? slot ?				# 3C579 ethernet cards
#fea*	at eisa? slot ?				# DEC DEFEA FDDI cards
#le*	at pci? dev ? function ?		# PCnet-PCI based ethernet cards
#de*	at pci? dev ? function ?		# DC21X4X-based ethernet cards
#ep*	at pci? dev ? function ?		# 3C59x/3C90x ethernet cards
#fpa*	at pci? dev ? function ?		# DEC DEFPA FDDI cards

#pss0	at isa? port 0x220 irq 7 drq 6  # Personal Sound System
#sp0	at pss0 port 0x530 irq 10 drq 0	# 	sound port driver
#audio*	at sp0

#sb0	at isa? port 0x220 irq 7 drq 1	# SoundBlaster
#audio*	at sb0
#wss0	at isa? port 0x530 irq 10 drq 0	# Windows Sound System
#audio*	at wss0
#pas0	at isa? port 0x220 irq 7 drq 1	# ProAudio Spectrum
#audio*	at pas0
#gus0	at isa? port 0x220 irq 7 drq 1 flags 6 # Gravis Ultra Sound (flags is record drq for full-duplex)
#audio*	at gus0
#spkr0	at pckbd? port 0x61

# Joystick driver. Probe is a little strange; add only if you have one.
#joy0	at isa? port 0x201

# PnP bus and devices should be declared last 
#isapnp0	at isa? 
#ep*	at isapnp?
#sb*	at isapnp?
#audio*	at sb?
#joy*	at isapnp?

#include	"arch/i386/conf/GENERIC.local"

pseudo-device	loop	1		# network loopback
pseudo-device	bpfilter 8		# packet filter
#pseudo-device	sl	2		# CSLIP
#pseudo-device	ppp	2		# PPP
#pseudo-device	tun	2		# network tunneling over tty
pseudo-device	ipfilter		# ip filter

pseudo-device	pty	64		# pseudo-terminals
#pseudo-device	tb	1		# tablet line discipline
#pseudo-device	vnd	4		# paging to files
#pseudo-device	ccd	4		# concatenated disk devices
-- 
Dave Burgess                   Network Engineer - Nebraska On-Ramp, Inc.
*bsd FAQ Maintainer / SysAdmin for the NetBSD system in my spare bedroom
"Just because something is stupid doesn't mean there isn't someone that 
doesn't want to do it...."