Hi,

A reliable box has begun to randomly reboot in the last couple of days.

There's nothing obviously unusual in /var/log/*

$ ls -ld /var/crash
drwxrwx---  2 root  wheel  512 Dec 24  2013 /var/crash/
$ ls -lA /var/crash
total 4
-rw-r--r--  1 root  wheel  5 Jul 30  2013 minfree

I set up a 1 min cron job of sysctl | fgrep hw.sensors.lm1.temp & uptime
The last one before a reboot was:
hw.sensors.lm1.temp0=34.00 degC
hw.sensors.lm1.temp2=33.50 degC
 2:53PM  up 31 mins, 2 users, load averages: 0.13, 0.19, 0.23

I'm guessing some bit of hardware is on it's way out, but which?

$ ls -l /var/run/dmesg.boot
-rw-r--r--  1 root  wheel  3612 Aug  5 14:58 /var/run/dmesg.boot


OpenBSD 5.4 (GENERIC) #37: Tue Jul 30 12:05:01 MDT 2013
    dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Intel Pentium III ("GenuineIntel" 686-class, 128KB L2 cache) 635 MHz
cpu0: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PSE36,MMX,FXSR,SSE,PERF
real mem  = 535228416 (510MB)
avail mem = 515035136 (491MB)
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 01/15/99, BIOS32 rev. 0 @ 0xfdb70, SMBIOS 
rev. 2.0 @ 0xf0480 (24 entries)
bios0: vendor American Megatrends Inc. version "063101" date 01/15/99
bios0: Supermicro Computer Intel 810
apm0 at bios0: Power Management spec V1.2
acpi at bios0 function 0x0 not configured
pcibios0 at bios0: rev 2.1 @ 0xf0000/0x10000
pcibios0: PCI BIOS has 9 Interrupt Routing table entries
pcibios0: PCI Interrupt Router at 000:31:0 ("Intel 82801AA LPC" rev 0x00)
pcibios0: PCI bus #1 is the last bus
bios0: ROM list: 0xc0000/0x8000
cpu0 at mainbus0: (uniprocessor)
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82810E Host" rev 0x03
vga1 at pci0 dev 1 function 0 "Intel 82810E Video" rev 0x03
intagp0 at vga1
agp0 at intagp0: aperture at 0xec000000, size 0x4000000
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
ppb0 at pci0 dev 30 function 0 "Intel 82801AA Hub-to-PCI" rev 0x02
pci1 at ppb0 bus 1
rl0 at pci1 dev 0 function 0 "Realtek 8139" rev 0x10: irq 11, address 
00:90:47:05:99:6d
rlphy0 at rl0 phy 0: RTL internal PHY
rl1 at pci1 dev 1 function 0 "Realtek 8139" rev 0x10: irq 10, address 
00:90:47:05:30:e8
rlphy1 at rl1 phy 0: RTL internal PHY
ichpcib0 at pci0 dev 31 function 0 "Intel 82801AA LPC" rev 0x02: 24-bit timer 
at 3579545Hz
pciide0 at pci0 dev 31 function 1 "Intel 82801AA IDE" rev 0x02: DMA, channel 0 
wired to compatibility, channel 1 wired to compatibility
wd0 at pciide0 channel 0 drive 0: <ST3250820A>
wd0: 16-sector PIO, LBA48, 238475MB, 488397168 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2
wd1 at pciide0 channel 1 drive 0: <Maxtor 5A320J0>
wd1: 16-sector PIO, LBA48, 308921MB, 632672208 sectors
wd1(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 2
uhci0 at pci0 dev 31 function 2 "Intel 82801AA USB" rev 0x02: irq 5
ichiic0 at pci0 dev 31 function 3 "Intel 82801AA SMBus" rev 0x02: irq 10
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 256MB SDRAM non-parity PC133CL2
spdmem1 at iic0 addr 0x51: 256MB SDRAM non-parity PC133CL2
auich0 at pci0 dev 31 function 5 "Intel 82801AA AC97" rev 0x02: irq 10, ICH AC97
ac97: codec id 0x43525934 (Cirrus Logic CS4299 rev 4)
ac97: codec features headphone, 20 bit DAC, 18 bit ADC, Crystal Semi 3D
audio0 at auich0
isa0 at ichpcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com0: console
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
wbsio0 at isa0 port 0x2e/2: W83627HF rev 0x13
lm1 at wbsio0 port 0x290/8: W83627HF
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
usb0 at uhci0: USB revision 1.0
uhub0 at usb0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
mtrr: Pentium Pro MTRR support
vscsi0 at root
scsibus0 at vscsi0: 256 targets
softraid0 at root
scsibus1 at softraid0: 256 targets
root on wd0a (0e3aa2ac975978d6.a) swap on wd0b dump on wd0b
WARNING: / was not properly unmounted

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