===================================== WARNING: bad unlock balance detected! 5.15.167-syzkaller #0 Not tainted ------------------------------------- kworker/u5:4/3576 is trying to release lock (&chan->lock) at: [] l2cap_chan_unlock include/net/bluetooth/l2cap.h:860 [inline] [] l2cap_conless_channel net/bluetooth/l2cap_core.c:7770 [inline] [] l2cap_recv_frame+0x136f/0x8ae0 net/bluetooth/l2cap_core.c:7823 but there are no more locks to release! other info that might help us debug this: 2 locks held by kworker/u5:4/3576: #0: ffff888073d17938 ((wq_completion)hci1#2){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc90002e97d20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 stack backtrace: CPU: 1 PID: 3576 Comm: kworker/u5:4 Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: hci1 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_unlock_imbalance_bug+0x248/0x2b0 kernel/locking/lockdep.c:5065 __lock_release kernel/locking/lockdep.c:5302 [inline] lock_release+0x596/0x9a0 kernel/locking/lockdep.c:5643 __mutex_unlock_slowpath+0xde/0x750 kernel/locking/mutex.c:851 l2cap_chan_unlock include/net/bluetooth/l2cap.h:860 [inline] l2cap_conless_channel net/bluetooth/l2cap_core.c:7770 [inline] l2cap_recv_frame+0x136f/0x8ae0 net/bluetooth/l2cap_core.c:7823 hci_acldata_packet net/bluetooth/hci_core.c:4969 [inline] hci_rx_work+0x48f/0x990 net/bluetooth/hci_core.c:5160 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287