panic under -current after upgrade + switchover to pf(4)

Hi,
I get the following panic constantly after some time after upgrading my -current
and switching to pf(4) instead of ipf(4):

(fw)(root) gdb -k /sys/i386/compile/fw~/kernel.debug vmcore.1
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This GDB was configured as "i386-undermydesk-freebsd"...
panic: page fault
panic messages:
---
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x8
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc063fff2
stack pointer           = 0x10:0xdcfefcc8
frame pointer           = 0x10:0xdcfefcd4
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         = 27 (swi8: tty:sio clock)
trap number             = 12
panic: page fault
at line 815 in file ../../../i386/i386/trap.c
cpuid = 0;
Uptime: 1h0m2s
Dumping 495 MB
 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 256 272 288 304 320 336
352 368 384 400 416 432 448 464 480
---
Reading symbols from /boot/kernel/acpi.ko...done.
Loaded symbols for /boot/kernel/acpi.ko
#0  doadump () at ../../../kern/kern_shutdown.c:236
236             dumping++;

#0  doadump () at ../../../kern/kern_shutdown.c:236
236             dumping++;
(kgdb) bt full
#0  doadump () at ../../../kern/kern_shutdown.c:236
No locals.
#1  0xc05770de in ?? ()
No symbol table info available.
#2  0xc0577461 in ?? ()
No symbol table info available.
#3  0xc0703564 in ?? ()
No symbol table info available.
#4  0xc0703273 in ?? ()
No symbol table info available.
#5  0xc0702ea9 in ?? ()
No symbol table info available.
#6  0xc06f2838 in ?? ()
No symbol table info available.
#7  0xc0585c5b in ?? ()
No symbol table info available.
#8  0xc0565591 in ?? ()
No symbol table info available.
#9  0xc0564675 in ?? ()
No symbol table info available.

BTW: No kernel modules are used besides acpi.ko.




Bye/2
---
Michael Reifenberger, Business Development Manager SAP-Basis, Plaut Consulting
Comp: Michael.Reifenberger_at_plaut.de | Priv: Michael_at_Reifenberger.com
      http://www.plaut.de           |       http://www.Reifenberger.com