A kernel cvsup'd at or about 1800 PDT this evening bought the farm
as so:

pmap_remove_pages(c3d07924, 0, bfbfe000, c3749034, 1)
exec_new_vmspace(c3dafe80, 1, 1, c3dafe80, c025dd5c)
exec_elf_imgact(c3d0fe80, c3d02fa0, c025e61c, 0, 1)
syscall(...)
Xint0x80_syscall(...)

I don't have enough disk space to save kernel cores, so I can't
give much more that this backtrace.

Kernel configuration follows:
--------------------------------------------------------------------------
machine         "i386"
ident           MORDRED
maxusers        10

cpu             "I586_CPU"              # aka Pentium(tm)

options         PQ_HUGECACHE
options         CPU_WT_ALLOC
options         "NO_F00F_HACK"
options         "COMPAT_43"
options         USER_LDT
options         SYSVSHM
options         SYSVSEM
options         SYSVMSG
options         "MD5"
options         DDB
#options        DDB_UNATTENDED
options         KTRACE                  #kernel tracing
options         PERFMON
options         UCONSOLE
options         USERCONFIG              #boot -c editor
options         VISUAL_USERCONFIG       #visual boot -c editor

options         INET                    #Internet communications protocols
pseudo-device   ether                   #Generic Ethernet
pseudo-device   loop                    #Network loopback device
pseudo-device   bpf             4       #Berkeley packet filter
pseudo-device   disc                    #Discard device

options         TCP_COMPAT_42           #emulate 4.2BSD TCP bugs
options         MROUTING                # Multicast routing

# One of these is mandatory:
options         FFS                     #Fast filesystem
options         MFS                     #Memory File System
options         NFS                     #Network File System
options         NFS_NOSERVER
options         CD9660                  #ISO 9660 filesystem
options         MSDOSFS                 #MS DOS File System
options         PROCFS                  #Process filesystem
options         FFS_ROOT                #FFS usable as root device
options         SOFTUPDATES

options         NSWAPDEV=2
options         QUOTA                   #enable disk quotas
options         CD9660_ROOTDELAY=20

# NFS options:
options         NFS_MINATTRTIMO=3       # VREG attrib cache timeout in sec
options         NFS_MAXATTRTIMO=60
options         NFS_MINDIRATTRTIMO=30   # VDIR attrib cache timeout in sec
options         NFS_MAXDIRATTRTIMO=60
options         NFS_GATHERDELAY=10      # Default write gather delay (msec)
options         NFS_UIDHASHSIZ=29       # Tune the size of nfssvc_sock with this
options         NFS_WDELAYHASHSIZ=16    # and with this
options         NFS_MUIDHASHSIZ=63      # Tune the size of nfsmount with this
#options        NFS_DEBUG               # Enable NFS Debugging

options         "P1003_1B"
options         "_KPOSIX_PRIORITY_SCHEDULING"
options         _KPOSIX_VERSION=199309L

controller      scbus0  #base SCSI code
device          da0     #SCSI direct access devices (aka disks)
device          da1
device          cd0     #SCSI CD-ROMs
device          pass0   #CAM passthrough driver

device          pt0 at scbus?
#device         sctarg0 at scbus?

options         SCSI_DELAY=8000 # Be pessimistic about Joe SCSI device
options         CHANGER_MIN_BUSY_SECONDS=2
options         CHANGER_MAX_BUSY_SECONDS=10

pseudo-device   pty     16      #Pseudo ttys - can go as high as 256
pseudo-device   speaker         #Play IBM BASIC-style noises out your speaker
pseudo-device   gzip            #Exec gzipped a.out's

# Size of the kernel message buffer.  Should be N * pagesize.
options         MSGBUF_SIZE=40960

controller      isa0
controller      pnp0

options         VESA
pseudo-device   splash

device          sc0     at isa?
options         MAXCONS=8               # number of virtual consoles
options         SC_HISTORY_SIZE=200     # number of history buffer lines

device          npx0    at nexus? port IO_NPX iosiz 0x0 flags 0x0 irq 13

controller      fdc0    at isa? port "IO_FD1" irq 6 drq 2
disk            fd0     at fdc0 drive 0

controller      atkbdc0 at isa? port IO_KBD
device          atkbd0  at atkbdc? irq 1
device          psm0    at atkbdc? port IO_KBD conflicts irq 12

device          sio0    at isa? port "IO_COM1" flags 0x10 irq 4
device          sio1    at isa? port "IO_COM2" flags 0x10 irq 3

device          vga0    at isa? port ? conflicts

device ed0 at isa? port 0x240 irq 10 iomem 0xcc000

# Sound:
#device pcm0 at isa? port ? irq 5 drq 3 flags 0x0f
controller      snd0
device sb0      at isa? port 0x220 irq 5 drq 3
device sbxvi0   at isa? drq 7
device sbmidi0  at isa? port 0x330

controller      pci0
controller      ncr0

controller      ppbus0
device          lpt0    at ppbus?
controller      ppc0    at isa? port ? irq 7

options         CLK_CALIBRATION_LOOP
#options        "CLK_USE_I8254_CALIBRATION"
options         CLK_USE_TSC_CALIBRATION
options         COMPAT_LINUX
options         NBUF=512
options         NMBCLUSTERS=512
options         PANIC_REBOOT_WAIT_TIME=16
options         SHOW_BUSYBUFS   # List buffers that prevent root unmount

# USB support
controller    uhci0
controller    usb0
device        ukbd0
device        ugen0


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