===================================== WARNING: bad unlock balance detected! 6.1.27-syzkaller #0 Not tainted ------------------------------------- kworker/u5:5/3599 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/u5:5/3599: #0: ffff888076318138 ((wq_completion)hci1#2){+.+.}-{0:0}, at: process_one_work+0x77a/0x11f0 #1: ffffc90003e5fd20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x7bd/0x11f0 kernel/workqueue.c:2264 stack backtrace: CPU: 1 PID: 3599 Comm: kworker/u5:5 Not tainted 6.1.27-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 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 print_unlock_imbalance_bug+0x24e/0x2c0 kernel/locking/lockdep.c:5109 __lock_release kernel/locking/lockdep.c:5346 [inline] lock_release+0x5ad/0xa20 kernel/locking/lockdep.c:5689 __mutex_unlock_slowpath+0xde/0x750 kernel/locking/mutex.c:907 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+0xa59/0x8890 net/bluetooth/l2cap_core.c:7786 hci_acldata_packet net/bluetooth/hci_core.c:3828 [inline] hci_rx_work+0x39b/0xa80 net/bluetooth/hci_core.c:4063 process_one_work+0x8aa/0x11f0 kernel/workqueue.c:2289 worker_thread+0xa5f/0x1210 kernel/workqueue.c:2436 kthread+0x26e/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Bluetooth: Wrong link type (-22)