Bluetooth: hci3: command 0x0406 tx timeout BUG: workqueue leaked lock or atomic: kworker/u5:9/0x00000000/3659 last function: hci_rx_work 1 lock held by kworker/u5:9/3659: #0: ffff88807dd39530 (&chan->lock/1){+.+.}-{3:3}, at: l2cap_chan_lock include/net/bluetooth/l2cap.h:863 [inline] #0: ffff88807dd39530 (&chan->lock/1){+.+.}-{3:3}, at: l2cap_conless_channel net/bluetooth/l2cap_core.c:7801 [inline] #0: ffff88807dd39530 (&chan->lock/1){+.+.}-{3:3}, at: l2cap_recv_frame+0x6fe/0x8bf0 net/bluetooth/l2cap_core.c:7867 CPU: 0 PID: 3659 Comm: kworker/u5:9 Not tainted 6.1.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: hci1 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 process_one_work+0xd1e/0x11d0 kernel/workqueue.c:2307 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ====================================================== WARNING: possible circular locking dependency detected 6.1.102-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u5:9/3659 is trying to acquire lock: ffff88805b2ab938 ((wq_completion)hci1#2){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267 but task is already holding lock: ffff88807dd39530 (&chan->lock/1){+.+.}-{3:3}, at: l2cap_chan_lock include/net/bluetooth/l2cap.h:863 [inline] ffff88807dd39530 (&chan->lock/1){+.+.}-{3:3}, at: l2cap_conless_channel net/bluetooth/l2cap_core.c:7801 [inline] ffff88807dd39530 (&chan->lock/1){+.+.}-{3:3}, at: l2cap_recv_frame+0x6fe/0x8bf0 net/bluetooth/l2cap_core.c:7867 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&chan->lock/1){+.+.}-{3:3}: reacquire_held_locks+0x3a4/0x660 kernel/locking/lockdep.c:5187 __lock_release kernel/locking/lockdep.c:5376 [inline] lock_release+0x378/0xa20 kernel/locking/lockdep.c:5682 process_one_work+0x988/0x11d0 kernel/workqueue.c:2298 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #0 ((wq_completion)hci1#2){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 process_one_work+0x7bf/0x11d0 kernel/workqueue.c:2267 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&chan->lock/1); lock((wq_completion)hci1#2); lock(&chan->lock/1); lock((wq_completion)hci1#2); *** DEADLOCK *** 1 lock held by kworker/u5:9/3659: #0: ffff88807dd39530 (&chan->lock/1){+.+.}-{3:3}, at: l2cap_chan_lock include/net/bluetooth/l2cap.h:863 [inline] #0: ffff88807dd39530 (&chan->lock/1){+.+.}-{3:3}, at: l2cap_conless_channel net/bluetooth/l2cap_core.c:7801 [inline] #0: ffff88807dd39530 (&chan->lock/1){+.+.}-{3:3}, at: l2cap_recv_frame+0x6fe/0x8bf0 net/bluetooth/l2cap_core.c:7867 stack backtrace: CPU: 0 PID: 3659 Comm: kworker/u5:9 Not tainted 6.1.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: hci1 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 process_one_work+0x7bf/0x11d0 kernel/workqueue.c:2267 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Bluetooth: hci0: command tx timeout Bluetooth: hci4: command tx timeout Bluetooth: hci0: command tx timeout