Panic after "in_cksum_skip: out of data by 260"

[EirikØverby]

Hi,

Today I received this message on my serial console:

in_cksum_skip: out of data by 260
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 00
fault virtual address   = 0xc
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc066ec33
stack pointer           = 0x10:0xd5437974
frame pointer           = 0x10:0xd5437998
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 36 (swi1: net)
trap number             = 12
panic: page fault
cpuid = 1
boot() called on cpu#0
Uptime: 1d15h8m10s

This server has been very stable for a very long time. This crash surprises
me somewhat.
Uname output:
FreeBSD carnen.net 5.3-STABLE FreeBSD 5.3-STABLE #0: Wed Feb  2 21:02:44 CET
2005     root at carnen.net:/usr/obj/usr/src/sys/CARNEN  i386

Any idea what could have caused this?

Thanks,
/Eirik