I've run into this same bug.
I was able to trace it to a null pointer exception when loading the ath_pci module.
To reproduce: 1. moved madwifi drivers out of the way 2. boot 3. move madwifi drivers back 4. modprobe ath_pci 5. see kernel NULL pointer dereference in kmesg
attached are /proc/interrupts and output to kmesg
I've run into this same bug.
I was able to trace it to a null pointer exception when loading the ath_pci module.
To reproduce:
1. moved madwifi drivers out of the way
2. boot
3. move madwifi drivers back
4. modprobe ath_pci
5. see kernel NULL pointer dereference in kmesg
attached are /proc/interrupts and output to kmesg