Please don't ignore my message.
This is not harmless problem, because when I pairing game pad system hangs for a second.
And when I pairing headset I have no sound and pulse audio has crashed when I off headset.
$ uname -r
4.16.1-300.fc28.x86_64+debug
When I pairing headset SONY MDR-XB950B1:
[ 4488.566046] ============================================
[ 4488.566047] WARNING: possible recursive locking detected
[ 4488.566049] 4.16.1-300.fc28.x86_64+debug #1 Not tainted
[ 4488.566050] --------------------------------------------
[ 4488.566052] kworker/u17:2/680 is trying to acquire lock:
[ 4488.566054] (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}, at: [<000000008d97dbdd>] bt_accept_enqueue+0x3c/0xb0 [bluetooth]
[ 4488.566073]
but task is already holding lock:
[ 4488.566075] (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}, at: [<0000000033ac331c>] l2cap_sock_new_connection_cb+0x18/0xa0 [bluetooth]
[ 4488.566090]
other info that might help us debug this:
[ 4488.566092] Possible unsafe locking scenario:
[ 4488.566093] CPU0
[ 4488.566095] ----
[ 4488.566096] lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP);
[ 4488.566098] lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP);
[ 4488.566100]
*** DEADLOCK ***
[ 4488.566102] May be due to missing lock nesting notation
[ 4488.566104] 5 locks held by kworker/u17:2/680:
[ 4488.566105] #0: ((wq_completion)"%s"hdev->name#2){+.+.}, at: [<0000000087e4bbc5>] process_one_work+0x1d7/0x630
[ 4488.566112] #1: ((work_completion)(&hdev->rx_work)){+.+.}, at: [<0000000087e4bbc5>] process_one_work+0x1d7/0x630
[ 4488.566116] #2: (&conn->chan_lock){+.+.}, at: [<00000000ffc63d0c>] l2cap_connect+0x8f/0x5a0 [bluetooth]
[ 4488.566132] #3: (&chan->lock/2){+.+.}, at: [<00000000393c41d7>] l2cap_connect+0xa9/0x5a0 [bluetooth]
[ 4488.566155] #4: (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}, at: [<0000000033ac331c>] l2cap_sock_new_connection_cb+0x18/0xa0 [bluetooth]
[ 4488.566168]
stack backtrace:
[ 4488.566171] CPU: 0 PID: 680 Comm: kworker/u17:2 Not tainted 4.16.1-300.fc28.x86_64+debug #1
[ 4488.566173] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H, BIOS F11 08/12/2014
[ 4488.566183] Workqueue: hci0 hci_rx_work [bluetooth]
[ 4488.566185] Call Trace:
[ 4488.566190] dump_stack+0x85/0xbf
[ 4488.566193] __lock_acquire.cold.62+0x158/0x227
[ 4488.566198] ? mark_held_locks+0x57/0x80
[ 4488.566201] ? lock_acquire+0x9e/0x1b0
[ 4488.566211] ? bt_accept_enqueue+0x3c/0xb0 [bluetooth]
[ 4488.566215] ? lock_sock_nested+0x72/0xa0
[ 4488.566224] ? bt_accept_enqueue+0x3c/0xb0 [bluetooth]
[ 4488.566233] ? bt_accept_enqueue+0x3c/0xb0 [bluetooth]
[ 4488.566244] ? l2cap_sock_new_connection_cb+0x5d/0xa0 [bluetooth]
[ 4488.566255] ? l2cap_connect+0x110/0x5a0 [bluetooth]
[ 4488.566276] ? l2cap_recv_frame+0x6d0/0x2cb0 [bluetooth]
[ 4488.566281] ? __mutex_unlock_slowpath+0x4b/0x2b0
[ 4488.566291] ? l2cap_recv_frame+0x6e8/0x2cb0 [bluetooth]
[ 4488.566295] ? __mutex_unlock_slowpath+0x4b/0x2b0
[ 4488.566304] ? hci_rx_work+0x1c6/0x5d0 [bluetooth]
[ 4488.566307] ? process_one_work+0x261/0x630
[ 4488.566310] ? worker_thread+0x3a/0x390
[ 4488.566313] ? process_one_work+0x630/0x630
[ 4488.566315] ? kthread+0x120/0x140
[ 4488.566318] ? kthread_create_worker_on_cpu+0x70/0x70
[ 4488.566320] ? ret_from_fork+0x3a/0x50
[ 4488.626592] BUG: sleeping function called from invalid context at net/core/sock.c:2768
[ 4488.626597] in_atomic(): 1, irqs_disabled(): 0, pid: 1804, name: krfcommd
[ 4488.626599] INFO: lockdep is turned off.
[ 4488.626603] CPU: 6 PID: 1804 Comm: krfcommd Not tainted 4.16.1-300.fc28.x86_64+debug #1
[ 4488.626606] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H, BIOS F11 08/12/2014
[ 4488.626609] Call Trace:
[ 4488.626615] dump_stack+0x85/0xbf
[ 4488.626621] ___might_sleep.cold.72+0xac/0xbc
[ 4488.626626] ? lock_sock_nested+0x29/0xa0
[ 4488.626642] ? bt_accept_enqueue+0x3c/0xb0 [bluetooth]
[ 4488.626648] ? rfcomm_connect_ind+0x21b/0x260 [rfcomm]
[ 4488.626652] ? rfcomm_run+0x1620/0x1830 [rfcomm]
[ 4488.626657] ? do_wait_intr_irq+0xb0/0xb0
[ 4488.626664] ? rfcomm_check_accept+0x90/0x90 [rfcomm]
[ 4488.626667] ? kthread+0x120/0x140
[ 4488.626670] ? kthread_create_worker_on_cpu+0x70/0x70
[ 4488.626676] ? ret_from_fork+0x3a/0x50
When I pairing dualshock 4 game pad:
[ 1448.267449] ============================================
[ 1448.267450] WARNING: possible recursive locking detected
[ 1448.267452] 4.16.1-300.fc28.x86_64+debug #1 Not tainted
[ 1448.267453] --------------------------------------------
[ 1448.267455] kworker/u17:2/668 is trying to acquire lock:
[ 1448.267457] (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}, at: [<000000008dfc4ec7>] bt_accept_enqueue+0x3c/0xb0 [bluetooth]
[ 1448.267477]
but task is already holding lock:
[ 1448.267478] (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}, at: [<00000000b2d78b70>] l2cap_sock_new_connection_cb+0x18/0xa0 [bluetooth]
[ 1448.267491]
other info that might help us debug this:
[ 1448.267493] Possible unsafe locking scenario:
[ 1448.267494] CPU0
[ 1448.267495] ----
[ 1448.267496] lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP);
[ 1448.267498] lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP);
[ 1448.267500]
*** DEADLOCK ***
[ 1448.267501] May be due to missing lock nesting notation
[ 1448.267503] 5 locks held by kworker/u17:2/668:
[ 1448.267504] #0: ((wq_completion)"%s"hdev->name#2){+.+.}, at: [<000000003908f3cc>] process_one_work+0x1d7/0x630
[ 1448.267510] #1: ((work_completion)(&hdev->rx_work)){+.+.}, at: [<000000003908f3cc>] process_one_work+0x1d7/0x630
[ 1448.267514] #2: (&conn->chan_lock){+.+.}, at: [<0000000082009ad9>] l2cap_connect+0x8f/0x5a0 [bluetooth]
[ 1448.267527] #3: (&chan->lock/2){+.+.}, at: [<0000000006821ecb>] l2cap_connect+0xa9/0x5a0 [bluetooth]
[ 1448.267543] #4: (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}, at: [<00000000b2d78b70>] l2cap_sock_new_connection_cb+0x18/0xa0 [bluetooth]
[ 1448.267557]
stack backtrace:
[ 1448.267560] CPU: 6 PID: 668 Comm: kworker/u17:2 Not tainted 4.16.1-300.fc28.x86_64+debug #1
[ 1448.267561] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H, BIOS F11 08/12/2014
[ 1448.267571] Workqueue: hci0 hci_rx_work [bluetooth]
[ 1448.267573] Call Trace:
[ 1448.267579] dump_stack+0x85/0xbf
[ 1448.267582] __lock_acquire.cold.62+0x158/0x227
[ 1448.267586] ? mark_held_locks+0x57/0x80
[ 1448.267589] ? lock_acquire+0x9e/0x1b0
[ 1448.267598] ? bt_accept_enqueue+0x3c/0xb0 [bluetooth]
[ 1448.267602] ? lock_sock_nested+0x72/0xa0
[ 1448.267611] ? bt_accept_enqueue+0x3c/0xb0 [bluetooth]
[ 1448.267621] ? bt_accept_enqueue+0x3c/0xb0 [bluetooth]
[ 1448.267634] ? l2cap_sock_new_connection_cb+0x5d/0xa0 [bluetooth]
[ 1448.267644] ? l2cap_connect+0x110/0x5a0 [bluetooth]
[ 1448.267655] ? l2cap_recv_frame+0x6d0/0x2cb0 [bluetooth]
[ 1448.267659] ? __mutex_unlock_slowpath+0x4b/0x2b0
[ 1448.267671] ? l2cap_recv_frame+0x6e8/0x2cb0 [bluetooth]
[ 1448.267674] ? __mutex_unlock_slowpath+0x4b/0x2b0
[ 1448.267684] ? hci_rx_work+0x1c6/0x5d0 [bluetooth]
[ 1448.267687] ? process_one_work+0x261/0x630
[ 1448.267690] ? worker_thread+0x3a/0x390
[ 1448.267693] ? process_one_work+0x630/0x630
[ 1448.267695] ? kthread+0x120/0x140
[ 1448.267698] ? kthread_create_worker_on_cpu+0x70/0x70
[ 1448.267700] ? ret_from_fork+0x3a/0x50
[ 1448.378725] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[ 1448.378734] Bluetooth: HIDP socket layer initialized
[ 1448.397524] sony 0005:054C:09CC.0009: unknown main item tag 0x0
[ 1448.407894] input: Wireless Controller Touchpad as /devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9.1/1-9.1.7/1-9.1.7:1.0/bluetooth/hci0/hci0:71/0005:054C:09CC.0009/input/input23
[ 1448.408413] input: Wireless Controller Motion Sensors as /devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9.1/1-9.1.7/1-9.1.7:1.0/bluetooth/hci0/hci0:71/0005:054C:09CC.0009/input/input24
[ 1448.409153] input: Wireless Controller as /devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9.1/1-9.1.7/1-9.1.7:1.0/bluetooth/hci0/hci0:71/0005:054C:09CC.0009/input/input22
[ 1448.409597] sony 0005:054C:09CC.0009: input,hidraw6: BLUETOOTH HID v81.00 Gamepad [Wireless Controller] on 00:1a:7d:da:71:0a