===================================== WARNING: bad unlock balance detected! 5.15.112-syzkaller #0 Not tainted ------------------------------------- kworker/u5:2/3504 is trying to release lock (&conn->chan_lock) at: [] l2cap_bredr_sig_cmd+0xb07/0x9fb0 net/bluetooth/l2cap_core.c:5748 but there are no more locks to release! other info that might help us debug this: 2 locks held by kworker/u5:2/3504: #0: ffff88807d445138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2280 #1: ffffc90002c5fd20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2282 stack backtrace: CPU: 1 PID: 3504 Comm: kworker/u5:2 Not tainted 5.15.112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Workqueue: hci0 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_unlock_imbalance_bug+0x248/0x2b0 kernel/locking/lockdep.c:5064 __lock_release kernel/locking/lockdep.c:5301 [inline] lock_release+0x596/0x9a0 kernel/locking/lockdep.c:5642 __mutex_unlock_slowpath+0xde/0x750 kernel/locking/mutex.c:851 l2cap_bredr_sig_cmd+0xb07/0x9fb0 net/bluetooth/l2cap_core.c:5748 l2cap_sig_channel net/bluetooth/l2cap_core.c:6507 [inline] l2cap_recv_frame+0xa53/0x8870 net/bluetooth/l2cap_core.c:7786 hci_acldata_packet net/bluetooth/hci_core.c:4967 [inline] hci_rx_work+0x489/0x7d0 net/bluetooth/hci_core.c:5158 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2307