My dmesg
OpenBSD 4.8 (GENERIC.MP) #335: Mon Aug 16 09:09:20 MDT 2010 dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 2112618496 (2014MB) avail mem = 2042560512 (1947MB) mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.3 @ 0xfbf60 (49 entries) bios0: vendor American Megatrends Inc. version "080012" date 03/07/2006 bios0: ECS P4M800PRO-M acpi0 at bios0: rev 0 acpi0: sleep states S0 S1 S4 S5 acpi0: tables DSDT FACP APIC OEMB acpi0: wakeup devices UAR1(S4) MC97(S4) USB1(S1) USB2(S1) USB3(S1) USB4(S1) PCI1(S4) PCI2(S4) PCI3(S4) OLAN(S4) ILAN(S4) SLPB(S4) PWRB(S4) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: Intel(R) Pentium(R) D CPU 2.80GHz, 2795.01 MHz cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,CNXT-ID,CX16,xTPR,LONG cpu0: 1MB 64b/line 8-way L2 cache cpu0: apic clock running at 199MHz cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Pentium(R) D CPU 2.80GHz, 2794.56 MHz cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,CNXT-ID,CX16,xTPR,LONG cpu1: 1MB 64b/line 8-way L2 cache ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 3, 24 pins ioapic0: misconfigured as apic 1, remapped to apid 2 acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus 1 (P0P1) acpicpu0 at acpi0acpi0: unable to load \\_PR_.CPU1.SSDT acpicpu1 at acpi0acpi0: unable to load \\_PR_.CPU2.SSDT acpitz0 at acpi0: critical temperature 110 degC acpibtn0 at acpi0: SLPB acpibtn1 at acpi0: PWRB pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "VIA CN700 Host" rev 0x00 agp at pchb0 not configured pchb1 at pci0 dev 0 function 1 "VIA CN700 Host" rev 0x00 pchb2 at pci0 dev 0 function 2 "VIA CN700 Host" rev 0x00 pchb3 at pci0 dev 0 function 3 "VIA PT890 Host" rev 0x00 pchb4 at pci0 dev 0 function 4 "VIA CN700 Host" rev 0x00 pchb5 at pci0 dev 0 function 7 "VIA CN700 Host" rev 0x00 ppb0 at pci0 dev 1 function 0 "VIA VT8377 AGP" rev 0x00 pci1 at ppb0 bus 1 vga1 at pci1 dev 0 function 0 "VIA S3 Unichrome PRO IGP" rev 0x01 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) rl0 at pci0 dev 8 function 0 "Realtek 8139" rev 0x10: apic 2 int 16 (irq 10), address 00:1a:3f:51:72:3d rlphy0 at rl0 phy 0: RTL internal PHY rl1 at pci0 dev 9 function 0 "Realtek 8139" rev 0x10: apic 2 int 17 (irq 11), address 00:1a:3f:51:46:59 rlphy1 at rl1 phy 0: RTL internal PHY rl2 at pci0 dev 10 function 0 "Realtek 8139" rev 0x10: apic 2 int 18 (irq 5), address 00:1a:3f:52:34:4f rlphy2 at rl2 phy 0: RTL internal PHY pciide0 at pci0 dev 15 function 0 "VIA VT6420 SATA" rev 0x80: DMA pciide0: using apic 2 int 20 (irq 5) for native-PCI interrupt wd0 at pciide0 channel 0 drive 0: <SAMSUNG HD082GJ> wd0: 16-sector PIO, LBA48, 76319MB, 156301488 sectors wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 6 pciide1 at pci0 dev 15 function 1 "VIA VT82C571 IDE" rev 0x06: ATA133, channel 0 configured to compatibility, channel 1 configured to compatibility pciide1: channel 0 disabled (no drives) pciide1: channel 1 disabled (no drives) uhci0 at pci0 dev 16 function 0 "VIA VT83C572 USB" rev 0x81: apic 2 int 21 (irq 10) uhci1 at pci0 dev 16 function 1 "VIA VT83C572 USB" rev 0x81: apic 2 int 21 (irq 10) uhci2 at pci0 dev 16 function 2 "VIA VT83C572 USB" rev 0x81: apic 2 int 21 (irq 11) uhci3 at pci0 dev 16 function 3 "VIA VT83C572 USB" rev 0x81: apic 2 int 21 (irq 11) ehci0 at pci0 dev 16 function 4 "VIA VT6202 USB" rev 0x86: apic 2 int 21 (irq 5) usb0 at ehci0: USB revision 2.0 uhub0 at usb0 "VIA EHCI root hub" rev 2.00/1.00 addr 1 viapm0 at pci0 dev 17 function 0 "VIA VT8237 ISA" rev 0x00 iic0 at viapm0 spdmem0 at iic0 addr 0x50: 1GB DDR2 SDRAM non-parity PC2-5300CL5 spdmem1 at iic0 addr 0x51: 1GB DDR2 SDRAM non-parity PC2-5300CL5 vr0 at pci0 dev 18 function 0 "VIA RhineII-2" rev 0x78: apic 2 int 23 (irq 10), address 00:16:ec:82:1c:3b ukphy0 at vr0 phy 1: Generic IEEE 802.3u media interface, rev. 10: OUI 0x004063, model 0x0032 usb1 at uhci0: USB revision 1.0 uhub1 at usb1 "VIA UHCI root hub" rev 1.00/1.00 addr 1 usb2 at uhci1: USB revision 1.0 uhub2 at usb2 "VIA UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci2: USB revision 1.0 uhub3 at usb3 "VIA UHCI root hub" rev 1.00/1.00 addr 1 usb4 at uhci3: USB revision 1.0 uhub4 at usb4 "VIA UHCI root hub" rev 1.00/1.00 addr 1 isa0 at mainbus0 isadma0 at isa0 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 it0 at isa0 port 0x2e/2: IT8705F rev 3, EC port 0x290 mtrr: Pentium Pro MTRR support softraid0 at root root on wd0a swap on wd0b dump on wd0b kernel: protection fault trap, code=0 Stopped at pool_do_get+0x133: movq %rax,0x10(%rcx) This occurred 2 times between 2 days