The following has happened to me twice during a smbtar backup to my
Adaptec 1542 connected Exabyte 8200 tape drive...

aha0: exiting ccb still in transit!
stopped at _Debugger+0x4: Leave
>

and lo, I  am in the kernel debugger.

system specs (sorry for the message size, but I wanted to be complete...):

NetBSD beorn 1.2 NetBSD 1.2 (BEORN) #2: Tue Oct 22 18:48:46 EDT 1996
dfraser@beorn:/usr/src/sys/arch/i386/compile/BEORN i386

--- 
machine		i386		# architecture, used by config; REQUIRED

options		I386_CPU	# CPU classes; at least one is REQUIRED
options		I486_CPU
options		MATH_EMULATE	# floating point emulation

options		XSERVER,UCONSOLE
options		MACHINE_NONCONTIG

maxusers	32		# estimated number of users
options		TIMEZONE=0	# time zone to adjust RTC time by
options		DST=0		# daylight savings time used by RTC

options		SWAPPAGER	# paging; REQUIRED
options		VNODEPAGER	# mmap() of files
options		DEVPAGER	# mmap() of devices

options		DDB		# in-kernel debugger
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		COMPAT_10	# NetBSD 1.0,
options		COMPAT_11	# NetBSD 1.1,

options		USER_LDT	# user-settable LDT; used by WINE
options		LKM		# loadable kernel modules

options		FFS		# UFS
options		QUOTA		# UFS quotas
options		LFS		# log-structured file system
options		MFS		# memory file system

options		NFSCLIENT	# Network File System client
options		NFSSERVER	# Network File System server

options		FDESC		# /dev/fd
options		FIFO		# FIFOs; RECOMMENDED
options		KERNFS		# /kern
options		NULLFS		# loopback file system
options		PROCFS		# /proc
options		INET		# IP + ICMP + TCP + UDP
config		netbsd	swap generic
options		GENERIC

mainbus0 at root
isa0	at mainbus0
npx0	at isa? port 0xf0 irq 13	# math coprocessor
pc0	at isa? port 0x60 irq 1		# generic PC console device
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
lpt0	at isa? port 0x378 irq 7	# standard PC parallel ports
aha0	at isa? port 0x330 irq ? drq ?	# Adaptec 154[02] SCSI controllers
scsibus* at aha?
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
fdc0	at isa? port 0x3f0 irq 6 drq 2	# standard PC floppy controllers
fd*	at fdc? drive ?
wdc0	at isa? port 0x1f0 irq 14	# ST506, ESDI, and IDE controllers
wd*	at wdc? drive ?
ed0	at isa? port 0x300 iomem 0xcc000 irq 10
joy0	at isa? port 0x201

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	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

--
Dan J. Fraser -- dfraser@mother.com 
http://www.mother.com/~dfraser      
IRC Nick: Optic   Finger me for PGP public key 
Anytime things appear to be going better, you've overlooked something.