Fatal trap 12: page fault while in kernel mode

[wrivera at acedsl.com]

I recently installed freebsd 5.2.1, which seemed to go well. But lately my 
system has been locking up and rebooting. I have included the error 
that is displayed each time my system locks.

Jun 29 20:37:09 candice syslogd: kernel boot file is /boot/kernel/kernel
Jun 29 20:37:09 candice kernel: 
Jun 29 20:37:09 candice kernel: 
Jun 29 20:37:09 candice kernel: Fatal trap 12: page fault while in kernel mode
Jun 29 20:37:09 candice kernel: cpuid = 0; apic id = 00
Jun 29 20:37:09 candice kernel: fault virtual address        = 0xc5f12321
Jun 29 20:37:09 candice kernel: fault code                = supervisor read, 
page not present
Jun 29 20:37:09 candice kernel: instruction pointer        = 0x8:0xc0694770
Jun 29 20:37:09 candice kernel: stack pointer                = 0x10:0xddd77a1c
Jun 29 20:37:09 candice kernel: frame pointer                = 0x10:0xddd77a28
Jun 29 20:37:09 candice kernel: code segment                = base 0x0, limit 
0xfffff, type 
0x1b
Jun 29 20:37:09 candice kernel: = DPL 0, pres 1, def32 1, gran 1
Jun 29 20:37:09 candice kernel: processor eflags        = interrupt enabled, 
resume, 
IOPL = 0
Jun 29 20:37:09 candice kernel: current process                = 21866 
(devinfo)
Jun 29 20:37:09 candice kernel: trap number                = 12
Jun 29 20:37:09 candice kernel: panic: page fault
Jun 29 20:37:09 candice kernel: cpuid = 0; 
Jun 29 20:37:09 candice kernel: 
Jun 29 20:37:09 candice kernel: syncing disks, buffers remaining... 3428 3428 
3427 3427 3427 3427 3427 3427 3427 3427 3427 3427 3427 3427 3427 3427 3427 342
7 
3427 3427 3427 3427 

Does anyone have an idea why this is happening?