(2) Reboots with no message/info 2.5 i386

[daemons <daemons@www.worldramp.net>]

Hey,

Twice in about 30 minutes my machine rebooted without halt(8).  Both times
i was in XWindows using netscape (bsdos emu, bsdi binary) window maker and
a few xterms. (dmesg is attached)

first time it just rebooted without freezing, heard the modem drop carrier
and then was looking at my #9 video bios banner.  Second time froze dead,
hitl ctrl-alt-backspace, killed the x window and instantly rebooted.  your
guess is surely better than mine, whould a debug(able) kernel be able to
stop this madness or do I need to go some other route

any pointers on how to at least invesitgate this would be appreciated..
btw before today i ran this machine for about a week solid in X and
netscape, etc with no funny rebooting....

tia

being dmesg > dmesg.txt
OpenBSD 2.5 (GENERIC) #243: Fri Apr 16 09:16:34 MDT 1999
    deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Cyrix 6x86 (486-class)
BIOS mem  = 654336 conventional, 66060288 extended
real mem  = 66715648
avail mem = 58728448
using 840 buffers containing 3440640 bytes of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(7c) BIOS, date 03/03/97
bios0: pciinfo 0xf049d00c apminfo 0xf049d028 diskinfo 0xf049d050 cksumlen 1 memmap 0xf049d0cc
apm0 at bios0: Power Management spec V1.1
apm0: AC on, no battery
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82437VX System (TVX)" rev 0x02
pcib0 at pci0 dev 7 function 0 "Intel 82371SB (Triton II) PCI-ISA" rev 0x01
"Intel 82371SB (Triton II) IDE" rev 0x00 at pci0 dev 7 function 1 not configured
"S3 Trio32/64" rev 0x00 at pci0 dev 8 function 0 not configured
isa0 at mainbus0
isadma0 at isa0
wdc0 at isa0 port 0x1f0-0x1f7 irq 14
atapibus0 at wdc0
wd0 at wdc0 drive 0: <FUJITSU MPB3043ATU E>
wd0: 4125MB, 8940 cyl, 15 head, 63 sec, 512 bytes/sec, 8448300 sec total
wd0: using 16-sector 16-bit pio transfers, lba addressing (256KB cache)
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
sysbeep0 at pcppi0
lpt0 at isa0 port 0x378-0x37b irq 7
npx0 at isa0 port 0xf0-0xff: using exception 16
pccom0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, 16 byte fifo
pccom1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, 16 byte fifo
vt0 at isa0 port 0x60-0x6f irq 1: S3 764 (Trio64), 80 col, color, 8 scr, mf2-kbd
pms0 at vt0 irq 12
fdc0 at isa0 port 0x3f0-0x3f5 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
biomask 4040 netmask 4040 ttymask 50c2
root on wd0a
pctr: no performance counters in CPU
dkcsum: wd0 matched BIOS disk 80
rootdev=0x0 rrootdev=0x300 rawdev=0x302
WARNING: / was not properly unmounted
wd0g: hard error reading fsbn 7286000 of 7228656-7228767 (wd0 bn 8359520; cn 8846 tn 0 sn 50)
WARNING: R/W mount of /home denied.  Filesystem is not clean - run fsck
WARNING: R/W mount of /home denied.  Filesystem is not clean - run fsck
wd0g: hard error reading fsbn 7286000 of 7228656-7228767 (wd0 bn 8359520; cn 8846 tn 0 sn 50)
wd0g: hard error reading fsbn 7228687 (wd0 bn 8302207; cn 8785 tn 6 sn 4)