I just built a kernel with up-to-date -current.  It panics at boot 
time on a Thinkpad T42 with 2G of RAM.

....
cpu0: Enhanced SteepStep frequencies available (Mhz): 1800 1600 1400 1200 1000 800 600
uvm_fault(0xc06a6d80, 0xc07f0000, 0, 1) -> 0xe
kernel: supervisor trap page fault, code=0
Stopped in pid 0.1 (swapper) at netbsd:pnowk7_getstates+0x29: repe cmpsb(%esi),%es:(%edi)


Here's the kernel config file.

include "arch/i386/conf/GENERIC_LAPTOP"

options         APM_DISABLE_INTERRUPTS=0 # Don't disable interrupts

options         RBUS_MIN_START=0x90000000
options         NEW_BUFQ_STRATEGY

options         EST_FREQ_USERWRITE      # any user can set frequency
options         SHMMAXPGS=32768 # 2048 pages is the default
options         IPSEC           # IP security
options         IPSEC_ESP       # IP security (encryption part; define w/IPSEC)
options         PCKBD_LAYOUT="(KB_US | KB_SWAPCTRLCAPS)"
options         HZ=1000
file-system     TMPFS           # experimental - Efficient memory file-system

no acpi0                at mainbus0

#options                DEBUG

options AUICH_ATTACH_MODEM
pseudo-device   cgd             4       # cryptographic disk devices

pseudo-device   ifnull
pseudo-device   swwdog

ehci*   at cardbus? function ?  # Enhanced Host Controller
ohci*   at cardbus? function ?  # Open Host Controller

ugensa* at uhub? port ?
ucom* at ugensa?


pckbc*  at isa?