"fast data access mmu miss" on kernels w/o "makeoptions DEBUG=-g"

[John Nielsen]

Can anyone say why removing "makeoptions DEBUG=-g" from a kernel would make 
it unreliable?  I'm on an Ultra 5, and it's quite stable with either 
GENERIC or the kernel specified below.  However, commenting out the 
"makeoptions DEBUG=-g" line builds a kernel that boots but then panics 
right after mounting /:

Entropy harvesting: interrupts ethernet point_to_pointpanic: trap: fast data 
access mmu miss
Uptime:2s
Dumping 512 MB (2 chunks)
...


Here is the kernel config file (although the same thing happens on GENERIC 
sans the makeoptions line):

machine		sparc64
cpu		SUN4U
ident		MOON

makeoptions	DEBUG=-g		# Build kernel with gdb(1) debug symbols

options 	SCHED_4BSD		# 4BSD scheduler
options 	INET			# InterNETworking
options 	FFS			# Berkeley Fast Filesystem
options 	SOFTUPDATES		# Enable FFS soft updates support
options 	UFS_ACL			# Support for access control lists
options 	UFS_DIRHASH		# Improve performance on big directories
options 	NFSCLIENT		# Network Filesystem Client
options 	NFSSERVER		# Network Filesystem Server
options 	CD9660			# ISO 9660 Filesystem
options 	PROCFS			# Process filesystem (requires PSEUDOFS)
options 	PSEUDOFS		# Pseudo-filesystem framework
options 	GEOM_GPT		# GUID Partition Tables.
options 	COMPAT_43		# Compatible with BSD 4.3 [KEEP THIS!]
options		COMPAT_FREEBSD5		# Compatible with FreeBSD5
options 	SCSI_DELAY=5000		# Delay (in ms) before probing SCSI
options 	SYSVSHM			# SYSV-style shared memory
options 	SYSVMSG			# SYSV-style message queues
options 	SYSVSEM			# SYSV-style semaphores
options 	_KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions
options 	ADAPTIVE_GIANT		# Giant mutex is adaptive.

# Standard busses
device		ebus
device		isa
device		pci
device		sbus
device		central
device		fhc

# ATA and ATAPI devices
device		ata
device		atadisk		# ATA disk drives
device		atapicd		# ATAPI CDROM drives

# atkbdc0 controls both the keyboard and the PS/2 mouse
device		atkbdc		# AT keyboard controller
device		atkbd		# AT keyboard
device		psm		# PS/2 mouse

# syscons is the default console driver, resembling an SCO console
device		sc
device		machfb		# ATI Mach64 framebuffers
options 	KBD_INSTALL_CDEV # install a CDEV entry in /dev

# Builtin hardware
device		auxio		# auxiliary I/O device
device		clkbrd		# Clock Board (blinkenlight on Sun Exx00)
device		genclock	# Generic clock interface
device		eeprom		# eeprom (really a front-end for the MK48Txx)
device		mk48txx		# Mostek MK48Txx clocks
device		rtc		# rtc (really a front-end for the MC146818)
device		mc146818	# Motorola MC146818 and compatible clocks

# Serial (COM) ports
device		uart		# Multi-uart driver
device		puc		# Multi-channel uarts

# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device		miibus		# MII bus support
device		fxp		# Intel EtherExpress PRO/100B (82557, 82558)
device		hme		# Sun HME (Happy Meal Ethernet)
device		rl		# RealTek 8129/8139
device		xl		# 3Com 3c90x (``Boomerang'', ``Cyclone'')

# Pseudo devices.
device		loop		# Network loopback
device		mem		# Memory and kernel memory devices
device		random		# Entropy device
device		ether		# Ethernet support
device		sl		# Kernel SLIP
device		ppp		# Kernel PPP
device		tun		# Packet tunnel.
device		tap
device		pty		# Pseudo-ttys (telnet etc)
device		md		# Memory "disks"
device		bpf		# Berkeley packet filter
device		snp

options		IPFIREWALL
options		IPFIREWALL_FORWARD
options		DUMMYNET
options		HZ=500

options		LIBMCHAIN
options		LIBICONV
options		NETSMB
options		NETSMBCRYPTO
options		SMBFS

options		SC_HISTORY_SIZE=2000


Thanks,

JN