Here is the standard causes.
I all most all cases this is a hardware problem.

Motherboard is overheating because of years of accumulated dust.
Open box and use small paint brush to blow away dust on motherboard
chips.
Remove heat sink on CPU and clean out chocking dust and reinstall.

Power supply's just go bad over time resulting in lower operating
voltages
to motherboard and hard drive. Hard drive will not spin as fast
which causes
the r/w heads not to fly above platter with out touching the
surface.
Hard disk starts going bad because of this and will need replacement
along with the power supply.

Power supply has cooling fan which can become plugged with dust.
Cleaning out dust in power supply may result in output voltage to
return to normal.

Hard drive central bearing wears out over time and causes the
platters
to wobble allowing the r/w heads to rub on surface of platters
causing
surface damage and loss of data.

What you may be experiencing is end-of-life of your PC.

Back up your user data now or it may be gone for every.




-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Laurence
Sanford
Sent: Sunday, April 09, 2006 8:57 AM
To: [EMAIL PROTECTED]
Subject: Panic/reboot - a little help.


My desktop box, which has run very stable for a couple years now
using
which ever version of FreeBSD I've been running at the time, has
developed a sudden and alarming need to panic. I have two vmcore
files
at this point, but I'm unsure how much actual help they'll be in
figuring out what's happening because I don't have debugging
compiled
into the kernel (never needed it before!) nor do I actually know
exactly
how to gather any information from them if they *can* still be of
use. I
can tell you this has happened twice now in the past 5 hours. Once I
was
asleep, and once I was reading my email. I'm going to include what I
can
here, any suggestions or ideas what's happening will be a great
help.

[EMAIL PROTECTED](~)$ dmesg
Copyright (c) 1992-2005 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993,
1994
        The Regents of the University of California. All rights
reserved.
FreeBSD 6.0-STABLE #2: Sat Jan 14 12:03:12 CST 2006
    [EMAIL PROTECTED]:/usr/obj/usr/src/sys/Colossus
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) MP 2000+ (1666.74-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x662  Stepping = 2

Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,
PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
  AMD Features=0xc0480800<SYSCALL,MP,MMX+,3DNow+,3DNow>
real memory  = 536346624 (511 MB)
avail memory = 515342336 (491 MB)
MPTable: <TYAN     PAULANER    >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): APIC ID:  1
 cpu1 (AP): APIC ID:  0
ioapic0: Assuming intbase of 0
ioapic0 <Version 1.1> irqs 0-23 on motherboard
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
cpu0 on motherboard
cpu1 on motherboard
pcib0: <Host to PCI bridge> pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
agp0: <AMD 762 host to AGP bridge> port 0x1010-0x1013 mem
0xf8000000-0xfbffffff,0xf4c00000-0xf4c00fff at device 0.0 on pci0
pcib1: <MPTable PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <display, VGA> at device 5.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <AMD 768 UDMA100 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xf000-0xf00f at device 7.1 on
pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
pci0: <bridge> at device 7.3 (no driver attached)
pcib2: <MPTable PCI-PCI bridge> at device 16.0 on pci0
pci2: <PCI bus> on pcib2
ohci0: <OHCI (generic) USB controller> mem 0xf4900000-0xf4900fff irq
19
at device 0.0 on pci2
ohci0: [GIANT-LOCKED]
usb0: OHCI version 1.0, legacy support
usb0: SMM does not respond, resetting
usb0: <OHCI (generic) USB controller> on ohci0
usb0: USB revision 1.0
uhub0: AMD OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 4 ports with 4 removable, self powered
xl0: <3Com 3c905C-TX Fast Etherlink XL> port 0x2000-0x207f mem
0xf4901000-0xf490107f irq 19 at device 8.0 on pci2
miibus0: <MII bus> on xl0
ukphy0: <Generic IEEE 802.3u media interface> on miibus0
ukphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
xl0: Ethernet address: 00:e0:81:24:e7:bb
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem
0xc0000-0xc7fff,0xc8000-0xc87ff,0xe0000-0xe3fff on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse Explorer, device ID 4
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/9 bytes threshold
ppbus0: <Parallel port bus> on ppc0
ppbus0: IEEE1284 device found /NIBBLE/ECP
Probing for PnP devices on ppbus0:
ppbus0: <HEWLETT-PACKARD DESKJET 810C> MLC,PCL,PML
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on
isa0
unknown: <PNP0303> can't assign resources (port)
unknown: <PNP0c02> can't assign resources (memory)
unknown: <PNP0501> can't assign resources (port)
unknown: <PNP0501> can't assign resources (port)
unknown: <PNP0f13> can't assign resources (irq)
unknown: <PNP0401> can't assign resources (port)
Timecounters tick every 1.000 msec
ad0: 43979MB <IBM DTLA-307045 TX6OA6AA> at ata0-master UDMA100
ad2: 38166MB <WDC WD400BB-22CAA0 16.06V16> at ata1-master UDMA100
acd0: DVDR <LITE-ON DVDRW SOHW-832S/VS01> at ata1-slave UDMA33
SMP: AP CPU #1 Launched!
Trying to mount root from ufs:/dev/ad0s1a
WARNING: / was not properly dismounted
WARNING: /tmp was not properly dismounted
WARNING: /usr was not properly dismounted
/usr: mount pending error: blocks 216 files 5
WARNING: /usr/ports was not properly dismounted
WARNING: /usr/src was not properly dismounted
WARNING: /var was not properly dismounted
cd0 at ata1 bus 0 target 1 lun 0
cd0: <LITE-ON DVDRW SOHW-832S VS01> Removable CD-ROM SCSI-0 device
cd0: 33.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not
present
drm0: <Matrox G400/G450 (AGP)> mem
0xf6000000-0xf7ffffff,0xf4800000-0xf4803fff,0xf4000000-0xf47fffff
irq 18
at device 5.0 on pci1
info: [drm] AGP at 0xf8000000 64MB
info: [drm] Initialized mga 3.2.1 20051102

Also, this message comes up when the system saves the vmcore:
Reboot after panic: Page Fault

Thanks in advance for the assistance with this.
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