This fault occurred on a VPS at rootbsd.net running OpenBSD 5.2 (Generic). I only have access via VNC once the VPS has faulted, so I took screenshots of: trace, pc, show registers.
http://bogoflop.com/privileged_instruction_fault/index.html dmesg OpenBSD 5.2 (GENERIC) #309: Wed Aug 1 09:58:55 MDT 2012 [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC real mem = 535822336 (511MB) avail mem = 499273728 (476MB) mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xeb01f (12 entries) bios0: vendor Xen version "4.1.2" date 11/15/2011 bios0: Xen HVM domU acpi0 at bios0: rev 2, ACPI control unavailable mpbios0 at bios0: Intel MP Specification 1.4 cpu0 at mainbus0: apid 0 (boot processor) cpu0: Intel(R) Xeon(R) CPU E5520 @ 2.27GHz, 2260.83 MHz cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,SSSE3,CX16,SSE4.1,SSE4.2,x2APIC,POPCNT,NXE,LONG,LAHF cpu0: 256KB 64b/line 8-way L2 cache cpu0: apic clock running at 99MHz cpu at mainbus0: not configured mpbios0: bus 0 is type ISA ioapic0 at mainbus0: apid 1 pa 0xfec00000, version 11, 48 pins ioapic0: misconfigured as apic 0, remapped to apid 1 pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02 pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x00 pciide0 at pci0 dev 1 function 1 "Intel 82371SB IDE" rev 0x00: DMA, channel 0 wired to compatibility, channel 1 wired to compatibility wd0 at pciide0 channel 0 drive 0: wd0: 16-sector PIO, LBA48, 10240MB, 20971520 sectors wd0(pciide0:0:0): using PIO mode 0, DMA mode 2 pciide0: channel 1 disabled (no drives) uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: apic 1 int 5 piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x01: SMBus disabled vga1 at pci0 dev 2 function 0 "Cirrus Logic CL-GD5446" rev 0x00 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) "XenSource Platform Device" rev 0x01 at pci0 dev 3 function 0 not configured em0 at pci0 dev 4 function 0 "Intel PRO/1000MT (82540EM)" rev 0x03: apic 1 int 5, address 00:16:3e:5b:5b:3e em1 at pci0 dev 5 function 0 "Intel PRO/1000MT (82540EM)" rev 0x03: apic 1 int 10, address 00:16:3e:2e:79:15 isa0 at pcib0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: 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 pms0 at pckbc0 (aux slot) pckbc0: using irq 12 for aux slot wsmouse0 at pms0 mux 0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 fd0 at fdc0 drive 0: density unknown fd1 at fdc0 drive 1: density unknown usb0 at uhci0: USB revision 1.0 uhub0 at usb0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 nvram: invalid checksum mtrr: Pentium Pro MTRR support uhidev0 at uhub0 port 2 configuration 1 interface 0 "QEMU 0.10.2 QEMU USB Tablet" rev 1.00/0.00 addr 2 uhidev0: iclass 3/1 uhid0 at uhidev0: input=6, output=0, feature=0 vscsi0 at root scsibus0 at vscsi0: 256 targets softraid0 at root scsibus1 at softraid0: 256 targets root on wd0a (de33daf7de0f9250.a) swap on wd0b dump on wd0b WARNING: / was not properly unmounted clock: unknown CMOS layout
