fbsd8.0: Fatal trap 9: general protection fault while in kernel mode

[Jakob Breivik Grimstveit]

I have - after having upgraded from 7.2 to 8.0, started experiencing
system unstability, with crashes about every 12-24h. Last time my
system crashed, I got the following screen output:

Fatal trap 9: general protection fault while in kernel mode
couid = 0; apic id = 00
instruction pointer    = 0x20:0xffffffff804eb471
stack pointer          = 0x28:0xffffff803e933a50
frame pointer          = 0x28:0xffffff803e933a70
code segment           = base 0x0, limit 0xfffff, type 0x1b
                       = DPL 0, pres 1, long 1, def32 0, gan 1
processor eflags       = interrupt enabled, resume, IOPL = 0
current process        = 3208 (httpd)
trap number            = 9
panic: general protection fault
cpuid = 0
Uptime: 12h19m9s
Cannot dump. Device not defined or unavailable
Automatic reboot in 15 seconds - press a key on the console to abort


(Typed in manually while reading screen).

What might be the problem? How can I resolve this?

Thanks in advance!

--
Vyrdsamt,
  Jakob Breivik Grimstveit | +47 4829 8152
  http://grimstveit.no/jakob | http://www.google.com/profiles/jakobbg