For the record:
While building some ports I got the following panic:
(6.0-CURRENT, UP, SCHED_ULE)
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x50
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc056ecfd
stack pointer = 0x10:0xd9978c68
frame pointer = 0x10:0xd9978cec
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 = 44 (pagedaemon)
trap number = 12
panic: page fault
#0 doadump () at pcpu.h:159
#1 0xc048aa37 in boot (howto=260) at ../../../kern/kern_shutdown.c:385
#2 0xc048ac93 in panic (fmt=0xc05b7c08 "%s")
at ../../../kern/kern_shutdown.c:541
#3 0xc059e2f4 in trap_fatal (frame=0xd9978c28, eva=80)
at ../../../i386/i386/trap.c:809
#4 0xc059e04f in trap_pfault (frame=0xd9978c28, usermode=0, eva=80)
at ../../../i386/i386/trap.c:727
#5 0xc059dcd1 in trap (frame=
{tf_fs = -644415464, tf_es = -1067909104, tf_ds = -644415472,
tf_edi = 697, tf_esi = 98743, tf_ebp = -644379412, tf_isp = -644379564,
tf_ebx = -1057635720, tf_edx = -1067310384, tf_ecx = -1056188520, tf_eax
= 0, tf_trapno = 12, tf_err = 0, tf_eip = -1068045059, tf_cs = 8,
tf_eflags = 66050, tf_esp = 0, tf_ss = 13})
at ../../../i386/i386/trap.c:417
#6 0xc0591dea in calltrap () at ../../../i386/i386/exception.s:140
#7 0xd9970018 in ?? ()
#8 0xc0590010 in db_disasm_esc (loc=98743, inst=0, short_addr=0,
size=-1067657947, seg=0x59b <Address 0x59b out of bounds>)
at ../../../i386/i386/db_disasm.c:1048
#9 0xc056f5d3 in vm_pageout () at ../../../vm/vm_pageout.c:1436
#10 0xc047918e in fork_exit (callout=0xc056f310 <vm_pageout>, arg=0x0,
frame=0xd9978d48) at ../../../kern/kern_fork.c:807
#11 0xc0591e4c in fork_trampoline () at
../../../i386/i386/exception.s:209
--
RIPE NCC - Delft University of Technology - The FreeBSD Project
marks at ripe.net - m.a.santcroos at ewi.tudelft.nl - marks at freebsd.org
http://www.santcroos.net/mark/