"make buildworld" crash my machine with a "kernel panic" 
with message:
Fatal trap 12: page fault while in kernel mode; Supervisor read: Page not present

here is my kernel config:
##
## FURY-F4 for kernel configuration file in /sys/i386/conf/FURY-F4
## 
## Made by Pierre-Francois LAURAND Pf
## Login   <pf@laurand.net>
## 
## Started on  Sun May 21 08:31:33 2000 Pierre-Francois LAURAND pushf
## Last update Sat May 27 00:47:42 2000 Pierre-Francois LAURAND Root
##

machine         i386
ident           FURY-F4
maxusers        32

makeoptions     KERNEL=FURY-F4

options         INCLUDE_CONFIG_FILE
#options        ROOTDEVNAME=\"ufs:da0s2a\"

cpu             I686_CPU

#####################################################################
# COMPATIBILITY OPTIONS  
#####################################################################

options         COMPAT_43
#options        USER_LDT
options         SYSVSHM
options         SYSVSEM
options         SYSVMSG
options         MD5

#####################################################################
# DEBUGGING OPTIONS
#####################################################################

options         KTRACE
options         PERFMON
options         UCONSOLE
options         USERCONFIG
options         VISUAL_USERCONFIG

#####################################################################
# NETWORKING OPTIONS
#####################################################################

options         INET
options         INET6
options         IPSEC
options         IPSEC_ESP
options         IPSEC_IPV6FWD
options         IPSEC_DEBUG

### Netgraph related:
options         NETGRAPH
options         NETGRAPH_ASYNC
options         NETGRAPH_BPF
options         NETGRAPH_CISCO
options         NETGRAPH_ECHO
options         NETGRAPH_FRAME_RELAY
options         NETGRAPH_HOLE
options         NETGRAPH_IFACE
options         NETGRAPH_KSOCKET
options         NETGRAPH_LMI
#options        NETGRAPH_MPPC_COMPRESSION
options         NETGRAPH_MPPC_ENCRYPTION
options         NETGRAPH_PPP
options         NETGRAPH_PPPOE
options         NETGRAPH_PPTPGRE
options         NETGRAPH_RFC1490
options         NETGRAPH_SOCKET
options         NETGRAPH_TEE
options         NETGRAPH_TTY
options         NETGRAPH_UI
options         NETGRAPH_VJC
pseudo-device   ether
pseudo-device   loop
pseudo-device   bpf
pseudo-device   disc
pseudo-device   tun
pseudo-device   sl      2
pseudo-device   ppp     2
options         PPP_BSDCOMP
options         PPP_DEFLATE
options         PPP_FILTER

pseudo-device   gif     4       #IPv6 and IPv4 tunneling
pseudo-device   faith   1       #for IPv6 and IPv4 translation

#options        MROUTING
### IPv4 Firewall:
options         IPFIREWALL
options         IPFIREWALL_VERBOSE
options         IPFIREWALL_VERBOSE_LIMIT=100
options         IPFIREWALL_FORWARD
### IPv6 Firewall:
options         IPV6FIREWALL
options         IPV6FIREWALL_VERBOSE
options         IPV6FIREWALL_VERBOSE_LIMIT=100
options         IPDIVERT
options         IPFILTER
options         IPFILTER_LOG
options         IPSTEALTH
options         TCP_DROP_SYNFIN
options         TCP_RESTRICT_RST
options         ICMP_BANDLIM
options         DUMMYNET
#options        BRIDGE

#####################################################################
# FILESYSTEM OPTIONS
#####################################################################

### Mandatory Files System:
options         FFS
options         MFS
options         NFS
options         CD9660

### STD FS:
options         FDESC
options         KERNFS
#options        MSDOSFS
#options        NTFS
options         CD9660_ROOT
options         FFS_ROOT
options         NFS_ROOT
#options        DEVFS
options         PROCFS
options         SOFTUPDATES
options         NSWAPDEV=3
options         QUOTA
options         SUIDDIR
options         NFS_MINATTRTIMO=3
options         NFS_MAXATTRTIMO=60
options         NFS_MINDIRATTRTIMO=30
options         NFS_MAXDIRATTRTIMO=60
options         NFS_GATHERDELAY=10
options         NFS_UIDHASHSIZ=29
options         NFS_WDELAYHASHSIZ=16
options         NFS_MUIDHASHSIZ=63

### Coda FS:
options         CODA
pseudo-device   vcoda   4
#options        EXT2FS
#####################################################################
# POSIX P1003.1B
#####################################################################

options         P1003_1B
options         _KPOSIX_PRIORITY_SCHEDULING
options         _KPOSIX_VERSION=199309L

#####################################################################
# SCSI DEVICES
#####################################################################

device          scbus
device          pass
device          cd
device          pt
#options        CAMDEBUG
#options        CAM_DEBUG_BUS=-1
#options        CAM_DEBUG_TARGET=-1
#options        CAM_DEBUG_LUN=-1
#options        CAM_DEBUG_FLAGS="CAM_DEBUG_INFO|CAM_DEBUG_TRACE|CAM_DEBUG_CDB"
#options        CAM_MAX_HIGHPOWER=4
#options        SCSI_NO_SENSE_STRINGS
#options        SCSI_NO_OP_STRINGS
options         SCSI_DELAY=10000
#options        CHANGER_MIN_BUSY_SECONDS=2
#options        CHANGER_MAX_BUSY_SECONDS=10
#options        SCSI_PT_DEFAULT_TIMEOUT="60"

#####################################################################
# MISCELLANEOUS DEVICES AND OPTIONS
#####################################################################

pseudo-device   pty
pseudo-device   speaker
pseudo-device   gzip
pseudo-device   vn
pseudo-device   md
pseudo-device   snp     3
#pseudo-device  ccd     4
#pseudo-device  vinum
#options        VINUMDEBUG

#####################################################################
# HARDWARE DEVICE CONFIGURATION
#####################################################################

device          isa
options         AUTO_EOI_1
#options        AUTO_EOI_2
#options        MAXMEM="(160*1024)"
#options        PPS_SYNC

### Keyboard:
device          atkbdc0 at isa? port IO_KBD
device          atkbd0  at atkbdc? irq 1
options         ATKBD_DFLT_KEYMAP
makeoptions     ATKBD_DFLT_KEYMAP="fr.iso.acc"

### Mouse:
device          psm0 at atkbdc? irq 12
options         PSM_HOOKRESUME
options         PSM_RESETAFTERSUSPEND

### VGA device:
device          vga0 at isa?
options         VGA_WIDTH90
options         VESA

### Splash Screen supoort:
pseudo-device   splash

### SCO Console device:
device          sc0 at isa?
options         MAXCONS=16
options         SC_ALT_MOUSE_IMAGE
options         SC_DFLT_FONT
makeoptions     SC_DFLT_FONT=iso
options         SC_HISTORY_SIZE=300
options         SC_PIXEL_MODE
#options        SC_NORM_ATTR="(FG_GREEN|BG_BLACK)"
options         SC_NORM_REV_ATTR="(FG_YELLOW|BG_RED)"
options         SC_KERNEL_CONS_ATTR="(FG_RED|BG_BLACK)"
options         SC_KERNEL_CONS_REV_ATTR="(FG_BLACK|BG_RED)"

### NPX:
device          npx0 at nexus? port IO_NPX flags 0x0 irq 13

### ATA Devices:
device          ata
device          atadisk
device          atapicd
options         ATA_ENABLE_ATAPI_DMA
device          ata0 at isa? port IO_WD1 irq 14
device          ata1 at isa? port IO_WD2 irq 15

### Floppy drive:
device          fdc0 at isa? port IO_FD1 irq 6 drq 2
device          fd0 at fdc0 drive 0

### Serial Port:
device          sio0 at isa? port IO_COM1 flags 0x10 irq 4
device          sio1 at isa? port IO_COM2 irq 3

### VOXWARE Sound:
#device         snd
#device         sb0 at isa? port 0x220 irq 5 drq 1
#device         sbxvi0 at isa? drq 5
#device         sbmidi0 at isa? port 0x330
#device         awe0 at isa? port 0x620
#device         opl0 at isa? port 0x388

### PCM Sound:
#device         pcm0 at isa? irq 10 drq 1 flags 0x0
device          pcm
device          sbc0 at isa? port 0x220 irq 5 drq 1 flags 0x15

### PCA sound:
device          pca0 at isa? port IO_TIMER1

### APM:
#device         apm0 at nexus? flags 0x20
device          apm0 at nexus?

### Joystick:
device          joy0 at isa? port IO_GAME

### EISA devices:
device          eisa

### PCI Devices and PCI options:
device          pci
device          ahc
#device         miibus
device          de
device          bktr
device          intpm
device          smb
device          smbus
device          iicbus
device          iicbb
device          ic
device          iic
device          iicsmb
options         OVERRIDE_CARD=CARD_MIRO
options         OVERRIDE_TUNER=PHILIPS_SECAM
#options        OVERRIDE_MSP=
#options        OVERRIDE_DBX=
#options        BKTR_USE_PLL
#options        BROOKTREE_SYSTEM_DEFAULT=BROOKTREE_PAL

### Parallel Port Bus:
device          ppbus
device          ppc0 at isa? irq 7
#device         vpo
device          lpt
device          plip
device          ppi
device          pps
device          lpbb

### Misc options:
options         HW_WDOG
options         PANIC_REBOOT_WAIT_TIME=30
#options        PNPBIOS

##########################################################

How-To-Repeat: cvsup FreeBSD src 4.0 STABLE, make buildworld
or even with shutdown now ; make buildworld.