INFO: possible irq lock inversion dependency detected

From: Arne Ahrend
Date: Sat Jul 08 2006 - 12:23:31 EST

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2.6.17-mm6 produces the following warning, but appears to be working perfectly fine.

Cheers,
Arne

=========================================================
[ INFO: possible irq lock inversion dependency detected ]
---------------------------------------------------------
swapper/0 just changed the state of lock:
(&bfusb->lock){..?+}, at: [<e28e59e2>] bfusb_rx_complete+0x34/0x468 [bfusb]
but this lock took another, hard-irq-unsafe lock in the past:
(&skb_queue_lock_key){-+..}

and interrupts could create inverse lock ordering between them.

other info that might help us debug this:
no locks held by swapper/0.

the first lock's dependencies:
-> (&bfusb->lock){..?+} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265f0f>] _write_lock_irqsave+0x2d/0x3c
[<e28e528d>] bfusb_open+0x27/0x5c [bfusb]
[<e291f8b5>] hci_dev_open+0x55/0x1e0 [bluetooth]
[<e2922ab2>] hci_sock_ioctl+0xd1/0x229 [bluetooth]
[<c02118b8>] sock_ioctl+0x193/0x1b9
[<c015d868>] do_ioctl+0x24/0x66
[<c015daf4>] vfs_ioctl+0x24a/0x25d
[<c015db35>] sys_ioctl+0x2e/0x4d
[<c010246b>] syscall_call+0x7/0xb
in-hardirq-R at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265d7e>] _read_lock+0x24/0x32
[<e28e59e2>] bfusb_rx_complete+0x34/0x468 [bfusb]
[<e2884c0d>] usb_hcd_giveback_urb+0x18/0x46 [usbcore]
[<e086c74c>] uhci_giveback_urb+0x120/0x14a [uhci_hcd]
[<e086cda9>] uhci_scan_schedule+0x536/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4
in-softirq-R at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265d7e>] _read_lock+0x24/0x32
[<e28e6096>] bfusb_send_frame+0x280/0x2b6 [bfusb]
[<e291ee60>] hci_send_frame+0x55/0x5d [bluetooth]
[<e291f14a>] hci_cmd_task+0x94/0xcd [bluetooth]
[<c011786f>] tasklet_action+0x45/0x75
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
hardirq-on-R at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265d7e>] _read_lock+0x24/0x32
[<e28e6096>] bfusb_send_frame+0x280/0x2b6 [bfusb]
[<e291ee60>] hci_send_frame+0x55/0x5d [bluetooth]
[<e291f14a>] hci_cmd_task+0x94/0xcd [bluetooth]
[<c011786f>] tasklet_action+0x45/0x75
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<e28e8284>] __key.23218+0x0/0xffffde58 [bfusb]
-> (modlist_lock){.+..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c012ed3b>] is_module_address+0x12/0x6e
[<c0127b3d>] static_obj+0x25/0x2f
[<c012861e>] lockdep_init_map+0x6c/0xab
[<c01a60c7>] __spin_lock_init+0x25/0x6e
[<e0842c6f>] rtl8139_init_one+0x57e/0x81b [8139too]
[<c01aa8b0>] pci_device_probe+0x3a/0x61
[<c01f0165>] driver_probe_device+0x46/0x9a
[<c01f025b>] __driver_attach+0x3b/0x66
[<c01efbee>] bus_for_each_dev+0x46/0x6d
[<c01f00b4>] driver_attach+0x16/0x1b
[<c01ef876>] bus_add_driver+0x6e/0x113
[<c01f04fa>] driver_register+0xa3/0xa8
[<c01aaa33>] __pci_register_driver+0x55/0x7a
[<e080f01c>] ____versions+0x12fc/0xfffffcb8 [firmware_class]
[<c01304c8>] sys_init_module+0x13c5/0x1570
[<c010246b>] syscall_call+0x7/0xb
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c012ed3b>] is_module_address+0x12/0x6e
[<c0127b3d>] static_obj+0x25/0x2f
[<c012861e>] lockdep_init_map+0x6c/0xab
[<c01a60c7>] __spin_lock_init+0x25/0x6e
[<e28865a0>] usb_init_urb+0x30/0x3a [usbcore]
[<e28865e5>] usb_alloc_urb+0x3b/0x46 [usbcore]
[<e28e5302>] bfusb_tx_wakeup+0x40/0x160 [bfusb]
[<e28e60ad>] bfusb_send_frame+0x297/0x2b6 [bfusb]
[<e291ee60>] hci_send_frame+0x55/0x5d [bluetooth]
[<e291f14a>] hci_cmd_task+0x94/0xcd [bluetooth]
[<c011786f>] tasklet_action+0x45/0x75
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<c02b2338>] modlist_lock+0x38/0x60
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c012ed3b>] is_module_address+0x12/0x6e
[<c0127b3d>] static_obj+0x25/0x2f
[<c012861e>] lockdep_init_map+0x6c/0xab
[<c01a60c7>] __spin_lock_init+0x25/0x6e
[<e28865a0>] usb_init_urb+0x30/0x3a [usbcore]
[<e28865e5>] usb_alloc_urb+0x3b/0x46 [usbcore]
[<e28e514e>] bfusb_rx_submit+0x20/0x138 [bfusb]
[<e28e5299>] bfusb_open+0x33/0x5c [bfusb]
[<e291f8b5>] hci_dev_open+0x55/0x1e0 [bluetooth]
[<e2922ab2>] hci_sock_ioctl+0xd1/0x229 [bluetooth]
[<c02118b8>] sock_ioctl+0x193/0x1b9
[<c015d868>] do_ioctl+0x24/0x66
[<c015daf4>] vfs_ioctl+0x24a/0x25d
[<c015db35>] sys_ioctl+0x2e/0x4d
[<c010246b>] syscall_call+0x7/0xb

-> (&parent->list_lock){.+..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<c014b01d>] cache_alloc_refill+0x61/0x48d
[<c014b4f8>] kmem_cache_zalloc+0x34/0x78
[<c014bb4b>] kmem_cache_create+0x153/0x414
[<c033569f>] kmem_cache_init+0x144/0x318
[<c0328514>] start_kernel+0x137/0x2be
[<c0100199>] 0xc0100199
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<c014ac65>] free_block+0xd5/0x10e
[<c014aa0e>] __cache_free+0xb1/0xf5
[<c014aaa8>] kmem_cache_free+0x56/0x70
[<c0111218>] free_task+0x21/0x29
[<c0112b4e>] __put_task_struct+0xc3/0xcd
[<c01143ec>] delayed_put_task_struct+0x3b/0x43
[<c012238e>] __rcu_process_callbacks+0xfc/0x155
[<c01223f9>] rcu_process_callbacks+0x12/0x23
[<c011786f>] tasklet_action+0x45/0x75
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<c04abe0c>] __key.15401+0x0/0x8
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<c014b01d>] cache_alloc_refill+0x61/0x48d
[<c014b49f>] __kmalloc+0x56/0x7b
[<c0216ade>] __alloc_skb+0x53/0x101
[<e28e5168>] bfusb_rx_submit+0x3a/0x138 [bfusb]
[<e28e5299>] bfusb_open+0x33/0x5c [bfusb]
[<e291f8b5>] hci_dev_open+0x55/0x1e0 [bluetooth]
[<e2922ab2>] hci_sock_ioctl+0xd1/0x229 [bluetooth]
[<c02118b8>] sock_ioctl+0x193/0x1b9
[<c015d868>] do_ioctl+0x24/0x66
[<c015daf4>] vfs_ioctl+0x24a/0x25d
[<c015db35>] sys_ioctl+0x2e/0x4d
[<c010246b>] syscall_call+0x7/0xb

-> (&skb_queue_lock_key){-+..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c02158f8>] skb_queue_tail+0x16/0x34
[<c0225ebe>] netlink_broadcast+0x1ba/0x2ba
[<c0197f2d>] kobject_uevent+0x347/0x3be
[<c01f09a2>] store_uevent+0x11/0x16
[<c01f14cf>] class_device_attr_store+0x1e/0x23
[<c017e33c>] sysfs_write_file+0x96/0xbd
[<c014e2c7>] vfs_write+0x8e/0x135
[<c014e81c>] sys_write+0x3a/0x61
[<c010246b>] syscall_call+0x7/0xb
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c02158f8>] skb_queue_tail+0x16/0x34
[<c0215232>] sock_queue_rcv_skb+0xca/0x104
[<c02479eb>] udp_queue_rcv_skb+0x1fd/0x222
[<c0248f6d>] udp_rcv+0x38c/0x4ae
[<c022d568>] ip_local_deliver+0x157/0x1e7
[<c022d3e4>] ip_rcv+0x3a6/0x3d3
[<c021a5d9>] netif_receive_skb+0x13d/0x1a4
[<c021bfb4>] process_backlog+0x7c/0x112
[<c021bdbe>] net_rx_action+0x5b/0xed
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
hardirq-on-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265e29>] _spin_lock_bh+0x29/0x37
[<c02480a7>] udp_poll+0x4f/0xc6
[<c0211105>] sock_poll+0x17/0x19
[<c015e205>] do_sys_poll+0x207/0x3c0
[<c015e3ff>] sys_poll+0x41/0x43
[<c010246b>] syscall_call+0x7/0xb
}
... key at: [<c04b41a8>] skb_queue_lock_key+0x0/0x18
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c02158f8>] skb_queue_tail+0x16/0x34
[<e28e5209>] bfusb_rx_submit+0xdb/0x138 [bfusb]
[<e28e5299>] bfusb_open+0x33/0x5c [bfusb]
[<e291f8b5>] hci_dev_open+0x55/0x1e0 [bluetooth]
[<e2922ab2>] hci_sock_ioctl+0xd1/0x229 [bluetooth]
[<c02118b8>] sock_ioctl+0x193/0x1b9
[<c015d868>] do_ioctl+0x24/0x66
[<c015daf4>] vfs_ioctl+0x24a/0x25d
[<c015db35>] sys_ioctl+0x2e/0x4d
[<c010246b>] syscall_call+0x7/0xb

-> (hcd_data_lock){++..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<e28859f1>] hcd_submit_urb+0x35/0x823 [usbcore]
[<e288650a>] usb_submit_urb+0x1f7/0x21d [usbcore]
[<e2886ca4>] usb_start_wait_urb+0x70/0x125 [usbcore]
[<e2886f9b>] usb_control_msg+0xd2/0xee [usbcore]
[<e2887773>] usb_get_descriptor+0x6d/0xa3 [usbcore]
[<e2887a84>] usb_get_device_descriptor+0x43/0x79 [usbcore]
[<e288550d>] usb_add_hcd+0x3b6/0x4cd [usbcore]
[<e288d245>] usb_hcd_pci_probe+0x1db/0x26a [usbcore]
[<c01aa8b0>] pci_device_probe+0x3a/0x61
[<c01f0165>] driver_probe_device+0x46/0x9a
[<c01f025b>] __driver_attach+0x3b/0x66
[<c01efbee>] bus_for_each_dev+0x46/0x6d
[<c01f00b4>] driver_attach+0x16/0x1b
[<c01ef876>] bus_add_driver+0x6e/0x113
[<c01f04fa>] driver_register+0xa3/0xa8
[<c01aaa33>] __pci_register_driver+0x55/0x7a
[<e080f04e>] ____versions+0x132e/0xfffffcb8 [firmware_class]
[<c01304c8>] sys_init_module+0x13c5/0x1570
[<c010246b>] syscall_call+0x7/0xb
in-hardirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<e2884bce>] urb_unlink+0x35/0x5c [usbcore]
[<e2884c03>] usb_hcd_giveback_urb+0xe/0x46 [usbcore]
[<e086c74c>] uhci_giveback_urb+0x120/0x14a [uhci_hcd]
[<e086cda9>] uhci_scan_schedule+0x536/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<e2884bce>] urb_unlink+0x35/0x5c [usbcore]
[<e2884c03>] usb_hcd_giveback_urb+0xe/0x46 [usbcore]
[<e288500d>] usb_hcd_poll_rh_status+0x18c/0x19c [usbcore]
[<e2885028>] rh_timer_func+0xb/0xe [usbcore]
[<c011ac7c>] run_timer_softirq+0xf1/0x14a
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<e289d498>] hcd_data_lock+0x38/0xffff1403 [usbcore]
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<e28859f1>] hcd_submit_urb+0x35/0x823 [usbcore]
[<e288650a>] usb_submit_urb+0x1f7/0x21d [usbcore]
[<e28e5211>] bfusb_rx_submit+0xe3/0x138 [bfusb]
[<e28e5299>] bfusb_open+0x33/0x5c [bfusb]
[<e291f8b5>] hci_dev_open+0x55/0x1e0 [bluetooth]
[<e2922ab2>] hci_sock_ioctl+0xd1/0x229 [bluetooth]
[<c02118b8>] sock_ioctl+0x193/0x1b9
[<c015d868>] do_ioctl+0x24/0x66
[<c015daf4>] vfs_ioctl+0x24a/0x25d
[<c015db35>] sys_ioctl+0x2e/0x4d
[<c010246b>] syscall_call+0x7/0xb

-> (&uhci->lock){++..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<e086e4fe>] uhci_hub_control+0x64/0x34c [uhci_hcd]
[<e2885fe4>] hcd_submit_urb+0x628/0x823 [usbcore]
[<e288650a>] usb_submit_urb+0x1f7/0x21d [usbcore]
[<e2886ca4>] usb_start_wait_urb+0x70/0x125 [usbcore]
[<e2886f9b>] usb_control_msg+0xd2/0xee [usbcore]
[<e2883635>] hub_probe+0x1c4/0x5f8 [usbcore]
[<e28882db>] usb_probe_interface+0x60/0x95 [usbcore]
[<c01f0165>] driver_probe_device+0x46/0x9a
[<c01f01c7>] __device_attach+0xe/0x10
[<c01efae8>] bus_for_each_drv+0x46/0x77
[<c01f020c>] device_attach+0x43/0x57
[<c01ef7eb>] bus_attach_device+0x18/0x35
[<c01eec1b>] device_add+0x2ef/0x3dc
[<e2887694>] usb_set_configuration+0x335/0x3a7 [usbcore]
[<e2883224>] usb_new_device+0x2a9/0x301 [usbcore]
[<e2885534>] usb_add_hcd+0x3dd/0x4cd [usbcore]
[<e288d245>] usb_hcd_pci_probe+0x1db/0x26a [usbcore]
[<c01aa8b0>] pci_device_probe+0x3a/0x61
[<c01f0165>] driver_probe_device+0x46/0x9a
[<c01f025b>] __driver_attach+0x3b/0x66
[<c01efbee>] bus_for_each_dev+0x46/0x6d
[<c01f00b4>] driver_attach+0x16/0x1b
[<c01ef876>] bus_add_driver+0x6e/0x113
[<c01f04fa>] driver_register+0xa3/0xa8
[<c01aaa33>] __pci_register_driver+0x55/0x7a
[<e080f04e>] ____versions+0x132e/0xfffffcb8 [firmware_class]
[<c01304c8>] sys_init_module+0x13c5/0x1570
[<c010246b>] syscall_call+0x7/0xb
in-hardirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<e086e8fb>] uhci_irq+0x115/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<e086e0a2>] uhci_hub_status_data+0x22/0x136 [uhci_hcd]
[<e2884eb4>] usb_hcd_poll_rh_status+0x33/0x19c [usbcore]
[<e2885028>] rh_timer_func+0xb/0xe [usbcore]
[<c011ac7c>] run_timer_softirq+0xf1/0x14a
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<e0871940>] __key.18912+0x0/0xffffd523 [uhci_hcd]
-> (&parent->list_lock){.+..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<c014b01d>] cache_alloc_refill+0x61/0x48d
[<c014b4f8>] kmem_cache_zalloc+0x34/0x78
[<c014bb4b>] kmem_cache_create+0x153/0x414
[<c033569f>] kmem_cache_init+0x144/0x318
[<c0328514>] start_kernel+0x137/0x2be
[<c0100199>] 0xc0100199
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<c014ac65>] free_block+0xd5/0x10e
[<c014aa0e>] __cache_free+0xb1/0xf5
[<c014aaa8>] kmem_cache_free+0x56/0x70
[<c0111218>] free_task+0x21/0x29
[<c0112b4e>] __put_task_struct+0xc3/0xcd
[<c01143ec>] delayed_put_task_struct+0x3b/0x43
[<c012238e>] __rcu_process_callbacks+0xfc/0x155
[<c01223f9>] rcu_process_callbacks+0x12/0x23
[<c011786f>] tasklet_action+0x45/0x75
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<c04abe0c>] __key.15401+0x0/0x8
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<c014b01d>] cache_alloc_refill+0x61/0x48d
[<c014af98>] kmem_cache_alloc+0x33/0x57
[<e086d862>] uhci_urb_enqueue+0x46/0x70e [uhci_hcd]
[<e288615a>] hcd_submit_urb+0x79e/0x823 [usbcore]
[<e288650a>] usb_submit_urb+0x1f7/0x21d [usbcore]
[<e2886ca4>] usb_start_wait_urb+0x70/0x125 [usbcore]
[<e2886f9b>] usb_control_msg+0xd2/0xee [usbcore]
[<e28822cc>] hub_port_init+0x1d6/0x45a [usbcore]
[<e2884035>] hub_thread+0x4bd/0x932 [usbcore]
[<c01242f2>] kthread+0xb0/0xde
[<c01006e9>] kernel_thread_helper+0x5/0xb

-> (&retval->lock){++..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c01f22f2>] dma_pool_alloc+0x14/0x189
[<e086d373>] uhci_alloc_td+0x14/0x42 [uhci_hcd]
[<e086eb62>] uhci_start+0x1b3/0x3a7 [uhci_hcd]
[<e288546d>] usb_add_hcd+0x316/0x4cd [usbcore]
[<e288d245>] usb_hcd_pci_probe+0x1db/0x26a [usbcore]
[<c01aa8b0>] pci_device_probe+0x3a/0x61
[<c01f0165>] driver_probe_device+0x46/0x9a
[<c01f025b>] __driver_attach+0x3b/0x66
[<c01efbee>] bus_for_each_dev+0x46/0x6d
[<c01f00b4>] driver_attach+0x16/0x1b
[<c01ef876>] bus_add_driver+0x6e/0x113
[<c01f04fa>] driver_register+0xa3/0xa8
[<c01aaa33>] __pci_register_driver+0x55/0x7a
[<e080f04e>] ____versions+0x132e/0xfffffcb8 [firmware_class]
[<c01304c8>] sys_init_module+0x13c5/0x1570
[<c010246b>] syscall_call+0x7/0xb
in-hardirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c01f21c4>] dma_pool_free+0x14/0x12e
[<e086c4cb>] uhci_free_td+0x6a/0x75 [uhci_hcd]
[<e086cbc9>] uhci_scan_schedule+0x356/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c01f21c4>] dma_pool_free+0x14/0x12e
[<e086c4cb>] uhci_free_td+0x6a/0x75 [uhci_hcd]
[<e086cbc9>] uhci_scan_schedule+0x356/0x7a8 [uhci_hcd]
[<e086e0ae>] uhci_hub_status_data+0x2e/0x136 [uhci_hcd]
[<e2884eb4>] usb_hcd_poll_rh_status+0x33/0x19c [usbcore]
[<e2885028>] rh_timer_func+0xb/0xe [usbcore]
[<c011ac7c>] run_timer_softirq+0xf1/0x14a
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<c04b3444>] __key.14448+0x0/0x8
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c01f22f2>] dma_pool_alloc+0x14/0x189
[<e086d6a9>] uhci_alloc_qh+0x21/0xc2 [uhci_hcd]
[<e086d8b7>] uhci_urb_enqueue+0x9b/0x70e [uhci_hcd]
[<e288615a>] hcd_submit_urb+0x79e/0x823 [usbcore]
[<e288650a>] usb_submit_urb+0x1f7/0x21d [usbcore]
[<e2886ca4>] usb_start_wait_urb+0x70/0x125 [usbcore]
[<e2886f9b>] usb_control_msg+0xd2/0xee [usbcore]
[<e28822cc>] hub_port_init+0x1d6/0x45a [usbcore]
[<e2884035>] hub_thread+0x4bd/0x932 [usbcore]
[<c01242f2>] kthread+0xb0/0xde
[<c01006e9>] kernel_thread_helper+0x5/0xb

-> (&urb->lock){+...} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<e288607f>] hcd_submit_urb+0x6c3/0x823 [usbcore]
[<e288650a>] usb_submit_urb+0x1f7/0x21d [usbcore]
[<e2886ca4>] usb_start_wait_urb+0x70/0x125 [usbcore]
[<e2886f9b>] usb_control_msg+0xd2/0xee [usbcore]
[<e2887773>] usb_get_descriptor+0x6d/0xa3 [usbcore]
[<e2887a84>] usb_get_device_descriptor+0x43/0x79 [usbcore]
[<e288550d>] usb_add_hcd+0x3b6/0x4cd [usbcore]
[<e288d245>] usb_hcd_pci_probe+0x1db/0x26a [usbcore]
[<c01aa8b0>] pci_device_probe+0x3a/0x61
[<c01f0165>] driver_probe_device+0x46/0x9a
[<c01f025b>] __driver_attach+0x3b/0x66
[<c01efbee>] bus_for_each_dev+0x46/0x6d
[<c01f00b4>] driver_attach+0x16/0x1b
[<c01ef876>] bus_add_driver+0x6e/0x113
[<c01f04fa>] driver_register+0xa3/0xa8
[<c01aaa33>] __pci_register_driver+0x55/0x7a
[<e080f04e>] ____versions+0x132e/0xfffffcb8 [firmware_class]
[<c01304c8>] sys_init_module+0x13c5/0x1570
[<c010246b>] syscall_call+0x7/0xb
in-hardirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<e086cd45>] uhci_scan_schedule+0x4d2/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4
}
... key at: [<e289e558>] __key.16238+0x0/0xffff030b [usbcore]
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<e086cd45>] uhci_scan_schedule+0x4d2/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4

-> (&waitqueue_lock_key){++..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265df2>] _spin_lock_irq+0x2a/0x38
[<c0263e7f>] wait_for_completion+0x15/0xc1
[<c01240e1>] keventd_create_kthread+0x2e/0x5e
[<c01241f6>] kthread_create+0xe5/0x131
[<c0117675>] cpu_callback+0x4d/0x97
[<c033373d>] spawn_ksoftirqd+0x11/0x23
[<c0100246>] _stext+0x26/0x1e6
[<c01006e9>] kernel_thread_helper+0x5/0xb
in-hardirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c010f489>] complete+0x12/0x3e
[<c0200185>] ata_qc_complete_internal+0x11/0x13
[<c01fddf7>] __ata_qc_complete+0x1cd/0x1d6
[<c01fdf18>] ata_qc_complete+0xa6/0xae
[<c01fe57c>] ata_hsm_qc_complete+0x1be/0x1ce
[<c01febba>] ata_hsm_move+0x62e/0x644
[<c01fec7d>] ata_host_intr+0xad/0xc7
[<c0205d07>] pata_via_interrupt+0xd7/0x10a
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133290>] handle_edge_irq+0xc1/0x10d
[<c010490c>] do_IRQ+0xa0/0xc4
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c010f489>] complete+0x12/0x3e
[<c0122155>] wakeme_after_rcu+0xe/0x10
[<c012238e>] __rcu_process_callbacks+0xfc/0x155
[<c01223f9>] rcu_process_callbacks+0x12/0x23
[<c011786f>] tasklet_action+0x45/0x75
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<c0375cd4>] waitqueue_lock_key+0x0/0x8
-> (&rq->rq_lock_key){++..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c010f651>] init_idle+0x4b/0x70
[<c03331d5>] sched_init+0xb6/0xbf
[<c0328437>] start_kernel+0x5a/0x2be
[<c0100199>] 0xc0100199
in-hardirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<c010f71a>] scheduler_tick+0xa4/0x2a1
[<c011b7e7>] update_process_times+0x51/0x5f
[<c0105810>] timer_interrupt+0x5f/0x9b
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133655>] handle_level_irq+0x76/0xc5
[<c010490c>] do_IRQ+0xa0/0xc4
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<c010fb9c>] task_rq_lock+0x17/0x1e
[<c010fcc6>] try_to_wake_up+0x18/0xed
[<c010fdaf>] default_wake_function+0x14/0x16
[<c010f118>] __wake_up_common+0x2b/0x50
[<c010f4a2>] complete+0x2b/0x3e
[<c0122155>] wakeme_after_rcu+0xe/0x10
[<c012238e>] __rcu_process_callbacks+0xfc/0x155
[<c01223f9>] rcu_process_callbacks+0x12/0x23
[<c011786f>] tasklet_action+0x45/0x75
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<c036326c>] per_cpu__runqueues+0x98c/0x994
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<c010fb9c>] task_rq_lock+0x17/0x1e
[<c010fcc6>] try_to_wake_up+0x18/0xed
[<c010fdaf>] default_wake_function+0x14/0x16
[<c010f118>] __wake_up_common+0x2b/0x50
[<c010f4a2>] complete+0x2b/0x3e
[<c01242d1>] kthread+0x8f/0xde
[<c01006e9>] kernel_thread_helper+0x5/0xb

... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c010f50e>] __wake_up+0x15/0x3b
[<e086c816>] uhci_make_qh_idle+0xa0/0xa8 [uhci_hcd]
[<e086cf54>] uhci_scan_schedule+0x6e1/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4

-> (base_lock_keys + cpu){++..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c011b5ce>] lock_timer_base+0x18/0x33
[<c011b65c>] __mod_timer+0x24/0x96
[<c011b738>] mod_timer+0x2d/0x31
[<c03398a6>] con_init+0xb5/0x1e5
[<c0339369>] console_init+0x20/0x30
[<c03284e6>] start_kernel+0x109/0x2be
[<c0100199>] 0xc0100199
in-hardirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c011b5ce>] lock_timer_base+0x18/0x33
[<c011b605>] del_timer+0x1c/0x4f
[<c01f66de>] scsi_delete_timer+0x10/0x23
[<c01f41a7>] scsi_done+0xd/0x1e
[<c0201f88>] atapi_qc_complete+0x202/0x212
[<c01fddf7>] __ata_qc_complete+0x1cd/0x1d6
[<c01fdf18>] ata_qc_complete+0xa6/0xae
[<c01fe57c>] ata_hsm_qc_complete+0x1be/0x1ce
[<c01febba>] ata_hsm_move+0x62e/0x644
[<c01fec7d>] ata_host_intr+0xad/0xc7
[<c0205d07>] pata_via_interrupt+0xd7/0x10a
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133290>] handle_edge_irq+0xc1/0x10d
[<c010490c>] do_IRQ+0xa0/0xc4
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265df2>] _spin_lock_irq+0x2a/0x38
[<c011abb4>] run_timer_softirq+0x29/0x14a
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<c0374fa8>] base_lock_keys+0x0/0x18
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c011b5ce>] lock_timer_base+0x18/0x33
[<c011b65c>] __mod_timer+0x24/0x96
[<c011b738>] mod_timer+0x2d/0x31
[<e086cfd5>] uhci_scan_schedule+0x762/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4

-> (&urb->lock#3){++..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<e086cd45>] uhci_scan_schedule+0x4d2/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4
in-hardirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<e086cd45>] uhci_scan_schedule+0x4d2/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<e086cd45>] uhci_scan_schedule+0x4d2/0x7a8 [uhci_hcd]
[<e086e0ae>] uhci_hub_status_data+0x2e/0x136 [uhci_hcd]
[<e2884eb4>] usb_hcd_poll_rh_status+0x33/0x19c [usbcore]
[<e2885028>] rh_timer_func+0xb/0xe [usbcore]
[<c011ac7c>] run_timer_softirq+0xf1/0x14a
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
}
... key at: [<e289e550>] __key.16249+0x0/0xffff0313 [usbcore]
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<e086cd45>] uhci_scan_schedule+0x4d2/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4

-> (&urb->lock#4){+...} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<e086cd45>] uhci_scan_schedule+0x4d2/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4
in-hardirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<e086cd45>] uhci_scan_schedule+0x4d2/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4
}
... key at: [<e28e8294>] __key.17448+0x0/0xffffde48 [bfusb]
... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265fb1>] _spin_lock+0x24/0x32
[<e086cd45>] uhci_scan_schedule+0x4d2/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4

... acquired at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<e086d83e>] uhci_urb_enqueue+0x22/0x70e [uhci_hcd]
[<e288615a>] hcd_submit_urb+0x79e/0x823 [usbcore]
[<e288650a>] usb_submit_urb+0x1f7/0x21d [usbcore]
[<e28e5211>] bfusb_rx_submit+0xe3/0x138 [bfusb]
[<e28e5299>] bfusb_open+0x33/0x5c [bfusb]
[<e291f8b5>] hci_dev_open+0x55/0x1e0 [bluetooth]
[<e2922ab2>] hci_sock_ioctl+0xd1/0x229 [bluetooth]
[<c02118b8>] sock_ioctl+0x193/0x1b9
[<c015d868>] do_ioctl+0x24/0x66
[<c015daf4>] vfs_ioctl+0x24a/0x25d
[<c015db35>] sys_ioctl+0x2e/0x4d
[<c010246b>] syscall_call+0x7/0xb

the second lock's dependencies:
-> (&skb_queue_lock_key){-+..} ops: 0 {
initial-use at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c02158f8>] skb_queue_tail+0x16/0x34
[<c0225ebe>] netlink_broadcast+0x1ba/0x2ba
[<c0197f2d>] kobject_uevent+0x347/0x3be
[<c01f09a2>] store_uevent+0x11/0x16
[<c01f14cf>] class_device_attr_store+0x1e/0x23
[<c017e33c>] sysfs_write_file+0x96/0xbd
[<c014e2c7>] vfs_write+0x8e/0x135
[<c014e81c>] sys_write+0x3a/0x61
[<c010246b>] syscall_call+0x7/0xb
in-softirq-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265db9>] _spin_lock_irqsave+0x2d/0x3c
[<c02158f8>] skb_queue_tail+0x16/0x34
[<c0215232>] sock_queue_rcv_skb+0xca/0x104
[<c02479eb>] udp_queue_rcv_skb+0x1fd/0x222
[<c0248f6d>] udp_rcv+0x38c/0x4ae
[<c022d568>] ip_local_deliver+0x157/0x1e7
[<c022d3e4>] ip_rcv+0x3a6/0x3d3
[<c021a5d9>] netif_receive_skb+0x13d/0x1a4
[<c021bfb4>] process_backlog+0x7c/0x112
[<c021bdbe>] net_rx_action+0x5b/0xed
[<c0117a76>] __do_softirq+0x45/0x9f
[<c010480e>] do_softirq+0x4d/0xab
hardirq-on-W at:
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265e29>] _spin_lock_bh+0x29/0x37
[<c02480a7>] udp_poll+0x4f/0xc6
[<c0211105>] sock_poll+0x17/0x19
[<c015e205>] do_sys_poll+0x207/0x3c0
[<c015e3ff>] sys_poll+0x41/0x43
[<c010246b>] syscall_call+0x7/0xb
}
... key at: [<c04b41a8>] skb_queue_lock_key+0x0/0x18

stack backtrace:
[<c0103433>] show_trace+0x16/0x19
[<c0103913>] dump_stack+0x1a/0x1f
[<c01285a5>] print_irq_inversion_bug+0xe3/0xf0
[<c012881d>] check_usage_forwards+0x32/0x3b
[<c01289d5>] mark_lock+0x1af/0x35a
[<c0129504>] __lock_acquire+0x328/0x929
[<c012a05e>] lock_acquire+0x4f/0x6d
[<c0265d7e>] _read_lock+0x24/0x32
[<e28e59e2>] bfusb_rx_complete+0x34/0x468 [bfusb]
[<e2884c0d>] usb_hcd_giveback_urb+0x18/0x46 [usbcore]
[<e086c74c>] uhci_giveback_urb+0x120/0x14a [uhci_hcd]
[<e086cda9>] uhci_scan_schedule+0x536/0x7a8 [uhci_hcd]
[<e086e907>] uhci_irq+0x121/0x137 [uhci_hcd]
[<e28857a7>] usb_hcd_irq+0x27/0x58 [usbcore]
[<c0132452>] handle_IRQ_event+0x18/0x4a
[<c0133349>] handle_fasteoi_irq+0x6d/0xae
[<c010490c>] do_IRQ+0xa0/0xc4
=======================
[<c0102e59>] common_interrupt+0x25/0x2c
[<c01013de>] cpu_idle+0x3c/0x65
[<c010043d>] rest_init+0x37/0x3e
[<c0328699>] start_kernel+0x2bc/0x2be
[<c0100199>] 0xc0100199

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