node1-1:~# modprobe ath_pci
ath_hal: 0.9.17.2 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
wlan: 0.8.4.2 (0.9.2)
ath_rate_sample: 1.2 (0.9.2)
ath_pci: 0.9.4.5 (0.9.2)
pcifront pci-0: pciback not responding!!!
PCI: Enabling device 0000:00:09.0 (0000 -> 0002)
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
BUG: soft lockup detected on CPU#0!

Pid: 932, comm:             modprobe
EIP: 0061:[<c0101227>] CPU: 0
EIP is at 0xc0101227
 EFLAGS: 00000246    Tainted: P       (2.6.16.29-xenU #8)
EAX: 00030000 EBX: 00000000 ECX: 00000000 EDX: 00000000
ESI: 00000000 EDI: c70f9dc0 EBP: c5073c9c DS: 007b ES: 007b
CR0: 8005003b CR2: b7e34000 CR3: 013c2000 CR4: 00000600
 [<c0105de3>] show_trace+0x13/0x20
 [<c01032b0>] show_regs+0x190/0x1e0
 [<c013bf28>] softlockup_tick+0x88/0xa0
 [<c012685d>] do_timer+0x20d/0x400
 [<c010901c>] timer_interrupt+0x1bc/0x670
 [<c013c07f>] handle_IRQ_event+0x3f/0xd0
 [<c013c1a1>] __do_IRQ+0x91/0x110
 [<c0106bcd>] do_IRQ+0x1d/0x30
 [<c025660b>] evtchn_do_upcall+0x9b/0xb0
 [<c01052fd>] hypervisor_callback+0x3d/0x48
 [<c02d6e65>] _spin_unlock_irqrestore+0x35/0x40
 [<c022ec2a>] pci_bus_read_config_byte+0x5a/0x70
 [<c70f3bd8>] ath_pci_probe+0x68/0x440 [ath_pci]
 [<c0233124>] pci_device_probe+0x64/0x80
 [<c0251c0a>] driver_probe_device+0x4a/0xc0
 [<c0251d7d>] __driver_attach+0x6d/0x70
 [<c0251534>] bus_for_each_dev+0x54/0x80
 [<c0251b37>] driver_attach+0x27/0x30
 [<c02510c3>] bus_add_driver+0x83/0x170
 [<c0251fd5>] driver_register+0x75/0xb0
 [<c02332eb>] __pci_register_driver+0x6b/0xa0
 [<c708f039>] init_ath_pci+0x39/0x59 [ath_pci]
 [<c01393c3>] sys_init_module+0x183/0x1c95
 [<c0105129>] syscall_call+0x7/0xb
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
Failed to obtain physical IRQ 0
pcifront pci-0: pciback not responding!!!
wifi%d: unable to attach hardware: 'Hardware didn't respond as expected' (HAL status 3)
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!