Here is the stack trace I get when I modprobe ath_pci with kernel
2.6.20-6-generic on my MacBook:

macbook kernel: [   84.696000] Oops: 0002 [#1]
macbook kernel: [   84.696000] SMP 
macbook kernel: [   84.696000] CPU:    0
macbook kernel: [   84.696000] EIP:    0060:[<f8f1b018>]    Tainted: P      VLI
macbook kernel: [   84.696000] EFLAGS: 00210286   (2.6.20-6-generic #2)
macbook kernel: [   84.696000] EIP is at ath_attach+0x148/0x1530 [ath_pci]
macbook kernel: [   84.696000] eax: 00000000   ebx: 0000001c   ecx: 00000000   
edx: f4385dd3
macbook kernel: [   84.696000] esi: df977000   edi: f437e400   ebp: f437e400   
esp: f4385d44
macbook kernel: [   84.696000] ds: 007b   es: 007b   ss: 0068
macbook kernel: [   84.696000] Process modprobe (pid: 5839, ti=f4384000 
task=dff8da90 task.ti=f4384000)
macbook kernel: [   84.696000] Stack: f8f80000 f4385dcc 00000000 00000000 
00000000 00000000 00000000 00000000 
macbook kernel: [   84.696000]        f437e000 001c0000 f437fa38 00000000 
00000000 00000000 00000000 00000000 
macbook kernel: [   84.696000]        00000000 00000000 00000000 00000000 
00000010 f41f3aa0 00000080 c03c0e00 
macbook kernel: [   84.696000] Call Trace:
macbook kernel: [   84.696000]  [setup_irq+241/480] setup_irq+0xf1/0x1e0
macbook kernel: [   84.696000]  [<f8f200f0>] ath_pci_probe+0x0/0x370 [ath_pci]
macbook kernel: [   84.696000]  [<f8f1d9b0>] ath_intr+0x0/0xb50 [ath_pci]
macbook kernel: [   84.696000]  [<f8f202c3>] ath_pci_probe+0x1d3/0x370 [ath_pci]
macbook kernel: [   84.696000]  [sysfs_create_link+110/352] 
sysfs_create_link+0x6e/0x160
macbook kernel: [   84.696000]  [<f8f200f0>] ath_pci_probe+0x0/0x370 [ath_pci]
macbook kernel: [   84.696000]  [really_probe+84/320] really_probe+0x54/0x140
macbook kernel: [   84.696000]  [driver_probe_device+73/192] 
driver_probe_device+0x49/0xc0
macbook kernel: [   84.696000]  [__driver_attach+158/160] 
__driver_attach+0x9e/0xa0
macbook kernel: [   84.696000]  [bus_for_each_dev+59/96] 
bus_for_each_dev+0x3b/0x60
macbook kernel: [   84.696000]  [driver_attach+22/32] driver_attach+0x16/0x20
macbook kernel: [   84.696000]  [pci_device_probe+86/128] 
pci_device_probe+0x56/0x80
macbook kernel: [   84.696000]  [__driver_attach+0/160] __driver_attach+0x0/0xa0
macbook kernel: [   84.696000]  [bus_add_driver+123/416] 
bus_add_driver+0x7b/0x1a0
macbook kernel: [   84.696000]  [__pci_register_driver+116/192] 
__pci_register_driver+0x74/0xc0
macbook kernel: [   84.696000]  [<f8dfe030>] init_ath_pci+0x30/0x54 [ath_pci]
macbook kernel: [   84.696000]  [sys_init_module+349/7072] 
sys_init_module+0x15d/0x1ba0
macbook kernel: [   84.696000]  [sys_mmap2+205/208] sys_mmap2+0xcd/0xd0
macbook kernel: [   84.696000]  [syscall_call+7/11] syscall_call+0x7/0xb
macbook kernel: [   84.696000]  =======================
macbook kernel: [   84.696000] Code: 89 40 04 c7 85 a4 17 00 00 e0 f6 f1 f8 8b 
54 24 20 8d 84 24 88 00 00 00 89 44 24 04 8b 42 1c 89 ea 89 04 24 89 d8 e8 58 
a2 01 00 <01> 00 00 00 24 2c 0f 84 98 05 00 00 8b 5c 24 2c 8b 43 04 3d 00 
macbook kernel: [   84.696000] EIP: [<f8f1b018>] ath_attach+0x148/0x1530 
[ath_pci] SS:ESP 0068:f4385d44

-- 
Madwifi driver prevents MacBook from booting
https://launchpad.net/bugs/82238

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