===================================== WARNING: bad unlock balance detected! 6.3.0-rc7-syzkaller-g327bf9bb94cf #0 Not tainted ------------------------------------- kworker/u5:3/6039 is trying to release lock (&conn->chan_lock) at: [] l2cap_disconnect_rsp+0x210/0x30c net/bluetooth/l2cap_core.c:4697 but there are no more locks to release! other info that might help us debug this: 2 locks held by kworker/u5:3/6039: #0: ffff0000d902d938 ((wq_completion)hci3#2){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 kernel/workqueue.c:2363 #1: ffff80001e587c20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 kernel/workqueue.c:2365 stack backtrace: CPU: 1 PID: 6039 Comm: kworker/u5:3 Not tainted 6.3.0-rc7-syzkaller-g327bf9bb94cf #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: hci3 hci_rx_work Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_unlock_imbalance_bug+0x250/0x2a4 kernel/locking/lockdep.c:5109 lock_release+0x4ac/0x9ac kernel/locking/lockdep.c:5689 __mutex_unlock_slowpath+0xe0/0x6b4 kernel/locking/mutex.c:907 mutex_unlock+0x18/0x24 kernel/locking/mutex.c:543 l2cap_disconnect_rsp+0x210/0x30c net/bluetooth/l2cap_core.c:4697 l2cap_le_sig_cmd net/bluetooth/l2cap_core.c:6426 [inline] l2cap_le_sig_channel net/bluetooth/l2cap_core.c:6464 [inline] l2cap_recv_frame+0x18b4/0x6a14 net/bluetooth/l2cap_core.c:7796 l2cap_recv_acldata+0x4f4/0x163c net/bluetooth/l2cap_core.c:8504 hci_acldata_packet net/bluetooth/hci_core.c:3828 [inline] hci_rx_work+0x2cc/0x8b8 net/bluetooth/hci_core.c:4063 process_one_work+0x788/0x12d4 kernel/workqueue.c:2390 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2537 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Bluetooth: hci1: ACL packet for unknown connection handle 457 Bluetooth: Wrong link type (-22) Bluetooth: hci1: ACL packet for unknown connection handle 457 Bluetooth: Wrong link type (-22) Bluetooth: Wrong link type (-22) Bluetooth: hci2: ACL packet for unknown connection handle 73 Bluetooth: Wrong link type (-22) Bluetooth: Wrong link type (-22) Bluetooth: Wrong link type (-22) Bluetooth: hci3: SCO packet for unknown connection handle 172 Bluetooth: hci1: unexpected event 0x48 length: 9 > 3 Bluetooth: hci1: wrong event for mode 0 Bluetooth: hci1: unexpected event 0x48 length: 9 > 3 Bluetooth: hci1: wrong event for mode 0 Bluetooth: hci1: unexpected event 0x48 length: 9 > 3 Bluetooth: hci1: wrong event for mode 0