kernel panic on boot with compiled in fwip(4)

I have just cvsuped and rebuilt kernel+world,
and i got the following panic on boot :

---/snip/---
fwohci0: <Ricoh R5C552> mem 0x0202000-0xc02027ff irq 11 at device 0.2 on 
pci2
fwohci0: Reserved 0x800 byes for rid 0x10 type 3 at 0xc0202000
fwohci0: [MPSAFE]
fwohci0: OHCI version 1.0 (ROM=0)
fwohci0: No. of Isochronous channels is 4.
fwohci0: EUI64 00:06:1b:02:01:21:bf:58
fwohci0: Phy 1394a available S400, 2 ports.
fwohci0: Link S400, max_rec 2048 bytes.
firewire0: <IEEE1394(FireWire) bus> on fwohci0
fwip0: <IP over FireWire> on firewire0

Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x4
fault code            = supervisor read, page not present
instruction pointer   = 0x20:0xc04ef1ee
stack pointer         = 0x28:0xc0c209c8
frame pointer         = 0x28:0xc0c209d8
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       = 0 (swapper)
[thread pid 0 tid 0]
Stopped at   fwip_attach+0xa2:    movl  0x4(%eax),%edx
db> trace
bus_generic_probe(c1aa3980,c1ad83cc,3e8,c04e5798,c1ad4000) at 
bus_generic_probe+0x46
firewire_attach(c1aa3980,c1aa3980,c1ad4000,c1ac8180,c0c20aa8) at 
firewire_attach+0xad
device_attach(c1aa3980,c1aa3980,c1ad4000) at device_attach+0x1be
fwohci_pci_add_child(c1ac8180,0,c0792a14,ffffffff) at 
fwohci_pci_add_child+0x38
firewire_identify(c07cee84,c1ac8180,c1ad4000,c1ac8180,c0c20aec) at 
firewire_identify+0x3e
bus_generic_probe(c1ac8180,0,c1ac8180,c1ac8180,c1ac8180) at 
bus_generic_probe+0x46
fwohci_pci_attach(c1ac8180,c1ac8180,c1aa2300,c1aa2300,c0c20b24) at 
fwohci_pci_attach+0x103
device_attach(c1ac8180) at device_attach+0x1be
bus_generic_attach(c1aa2300,6,c1a573c0,1,c04b1c84) at 
bus_generic_attach+0x12
acpi_pci_attach(c1aa2300,c1aa2300,0,c1a8bb0,c0c20b80) at 
acpi_pci_attach+0xd0
device_attach(c1aa2300) at device_attach+0x1be
bus_generic_attach(c1a8bb00,c1a8bb00,c1a8d000,c1a573c0,c1aaa100) at 
bus_generic_attach+0x12
acpi_pcib_attach(c1a8bb00,c1aaa130,2,c1a573c0,c1a8bb00) at 
acpi_pcib_attach+0x130
acpi_pcib_pci_attach(c1a8bb00,c1a8bb00,c1a8d000,c1a8d000,c0c20bf0) at 
acpi_pcib_pci_attach+0x7c
device_attach(c1a8bb00) at device_attach+0x1be
bus_generic_attach(c1a8d000,6,c1a28b20,1,c04b1c84) at 
bus_generic_attach+0x12
acpi_pci_attach(c1a8d000,c1a8d000,0,c19d1680,c0c20c4c) at 
acpi_pci_attach+0xd0
device_attach(c1a8d000) at device_attach+0x1be
bus_generic_attach(c19d1680,c19d1680,0,c1a28b20,c1a826e0) at 
bus_generic_attach+0x12
acpi_pcib_attach(c19d1680,c1a826f4,0,c07ddcc0,c19d1680) at 
acpi_pcib_attach+0x130
acpi_pcib_acpi_attach(c19d1680,c19d1680,c1a8e300,c1985700,c0c20cc8) at 
acpi_pcib_acpi_attach+0xcf
device_attach(c19d1680) at device_attach+0x1be
bus_generic_attach(c1985700,167f,1600,c1a761a8,4) at bus_generic_attach+0x12
acpi_attach(c1985700,c1985700,c1985d80,c1988a40,c0c20d28) at 
acpi_attach+0x631
device_attach(c1985700) at device_attach+0x1be
bus_generic_attach(c1985d80,c1985d80,c1985dcc,c0c20d54,c05b89a2) at 
bus_generic_attach+0x12
nexus_attach(c1985d80,c1985d80,c197b9b8,0,c0c20d64) at nexus_attach+0x13
device_attach(c1985d80,c07f6cb9,c0c20d6c,c07386a9,c0c20d88) at 
device_attach+0x1be
root_bus_configure(c0c20d88,c05770x37,0,c197bae4,c1ec00) at 
root_bus_configure+0x16
configure(0,c197bae4,c1ec00,c1e000,c25000) at configure+0x9
mi_startup() at mi_startup+0xb3
begin() at begin+0x2c
db>
---/end/---

The machine is IBM ThinkPad X31 running -CURRENT

kernel and loader conf are available at http://totalterror.net/freebsd/

P.S. i have been using this kernel conf for quite a while without problems.
But i haven't updated my system for probably a month or so, so i'm not 
sure when this
problem was introduced.

--niki