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
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