Panic when loading if_ath

Hello list,

A panic with if_ath (Atheros 2413)

root /sys/modules/ath_rate_amrr# make
root /sys/modules/ath_rate_amrr# make install
root ~# kldload if_ath
warning: KLD '/boot/kernel/if_ath.ko' is newer than the linker.hints file
ath0: <Atheros 2413> mem 0xc9000000-0xc900ffff irq 18 at device 1.0 on pci5
ath0: [ITHREAD]

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x0
fault code = supervisor read, page not present
instruction pointer = 0x20:0x0
stack pointer = 0x28:0xc43cc748
frame pointer = 0x28:0xc43cc75c
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 = 993 (kldload)
trap number = 12
panic: page fault
cpuid = 0

[dump]
[reboot]
WARNING: /tmp was not properly dismounted
WARNING: /usr was not properly dismounted
WARNING: /var was not properly dismounted

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x5bbfe499
fault code = supervisor read, page not present
instruction pointer  = 0x20:0xc0684c37
stack pointer = 0x28:0xc4364a5c
frame pointer = 0x28:0xc4364c28
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 = 136 (ifconfig)
trap number = 12
panic: page fault
cpuid = 0

[a few crashes later, when it comes to mind to get a backtrace]
root ~# kldload ath_rate
root ~# kldload if_ath
ath0: <Atheros 2413> mem 0xc9000000-0xc900ffff irq 18 at device 1.0 on pci5
ath0: [ITHREAD]
[panic]
uart_z8530_class(c4ac5000, 0, 1, 1, c4390000, ...) at 0
ar5212Attach(1a, c48b0000, 1, c4389000, c437c8ec, ...) at ar5212Attach+0x211
ath_hal_attach(1a, c48b0000, 1, c4389000, c437c8ec, ...) at
ath_hal_attach+0x56
ath_attach(1a, c48b0000, 3, c437c940, ffffffff, ...) at ath_attach+0x9e
ath_pci_attach(c46bb200, c4823854, c09fcf80, c099dc60, 80000000, ...) at
ath_pci_attach+0x332
device_attach([snip]) at device_attach+0x36f
device_probe_and_attach([snip) at ...+0x43
pci_driver_added([snip]) at +0x104
devclass_add_driver([snip]) at +0xe8
driver_module_handler([snip]) at +0x79
module_register_init()
linker_load_module()
kern_kldload()

(Please don't tell me you want any of that snips.)

Any extra information I can provide to you ?
I am willing to help debugging / crashing.

-- Jille