Bluetooth: hci4: Controller not accepting commands anymore: ncmd = 0 Bluetooth: hci4: Injecting HCI hardware error event Bluetooth: hci4: hardware error 0x00 ====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc8-syzkaller-00098-gec35307e18ba #0 Not tainted ------------------------------------------------------ kworker/u5:2/5095 is trying to acquire lock: ffff888023c2be70 ((work_completion)(&(&conn->timeout_work)->work)){+.+.}-{0:0}, at: __flush_work+0xdd/0xaf0 kernel/workqueue.c:3066 but task is already holding lock: ffffffff8e2fefa8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1790 [inline] ffffffff8e2fefa8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xd9/0x260 net/bluetooth/hci_conn.c:2437 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (hci_cb_list_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747 hci_connect_cfm include/net/bluetooth/hci_core.h:1775 [inline] hci_remote_features_evt+0x49e/0xa20 net/bluetooth/hci_event.c:3768 hci_event_func net/bluetooth/hci_event.c:7485 [inline] hci_event_packet+0x956/0xfd0 net/bluetooth/hci_event.c:7537 hci_rx_work+0xaeb/0x1230 net/bluetooth/hci_core.c:4043 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 -> #2 (&hdev->lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747 sco_sock_connect+0x1ea/0xa60 net/bluetooth/sco.c:593 __sys_connect_file+0x153/0x1a0 net/socket.c:1979 __sys_connect+0x165/0x1a0 net/socket.c:1996 __do_sys_connect net/socket.c:2006 [inline] __se_sys_connect net/socket.c:2003 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2003 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}: lock_sock_nested+0x3a/0xf0 net/core/sock.c:3471 lock_sock include/net/sock.h:1725 [inline] sco_sock_timeout+0xd1/0x290 net/bluetooth/sco.c:97 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 -> #0 ((work_completion)(&(&conn->timeout_work)->work)){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __flush_work+0x109/0xaf0 kernel/workqueue.c:3069 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3160 sco_conn_del+0x1b5/0x2b0 net/bluetooth/sco.c:205 sco_disconn_cfm+0x75/0xb0 net/bluetooth/sco.c:1379 hci_disconn_cfm include/net/bluetooth/hci_core.h:1793 [inline] hci_conn_hash_flush+0x126/0x260 net/bluetooth/hci_conn.c:2437 hci_dev_close_sync+0x5fb/0x1200 net/bluetooth/hci_sync.c:4850 hci_dev_do_close+0x31/0x70 net/bluetooth/hci_core.c:554 hci_error_reset+0xa2/0x140 net/bluetooth/hci_core.c:1059 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 other info that might help us debug this: Chain exists of: (work_completion)(&(&conn->timeout_work)->work) --> &hdev->lock --> hci_cb_list_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(hci_cb_list_lock); lock(&hdev->lock); lock(hci_cb_list_lock); lock((work_completion)(&(&conn->timeout_work)->work)); *** DEADLOCK *** 5 locks held by kworker/u5:2/5095: #0: ffff888072435938 ((wq_completion)hci4){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888072435938 ((wq_completion)hci4){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888072435938 ((wq_completion)hci4){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888072435938 ((wq_completion)hci4){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff888072435938 ((wq_completion)hci4){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff888072435938 ((wq_completion)hci4){+.+.}-{0:0}, at: process_one_work+0x86d/0x1710 kernel/workqueue.c:2260 #1: ffffc900035efda8 ((work_completion)(&hdev->error_reset)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1710 kernel/workqueue.c:2264 #2: ffff88802022d028 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x29/0x70 net/bluetooth/hci_core.c:552 #3: ffff88802022c078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x306/0x1200 net/bluetooth/hci_sync.c:4837 #4: ffffffff8e2fefa8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1790 [inline] #4: ffffffff8e2fefa8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xd9/0x260 net/bluetooth/hci_conn.c:2437 stack backtrace: CPU: 1 PID: 5095 Comm: kworker/u5:2 Not tainted 6.2.0-rc8-syzkaller-00098-gec35307e18ba #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Workqueue: hci4 hci_error_reset Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177 check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __flush_work+0x109/0xaf0 kernel/workqueue.c:3069 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3160 sco_conn_del+0x1b5/0x2b0 net/bluetooth/sco.c:205 sco_disconn_cfm+0x75/0xb0 net/bluetooth/sco.c:1379 hci_disconn_cfm include/net/bluetooth/hci_core.h:1793 [inline] hci_conn_hash_flush+0x126/0x260 net/bluetooth/hci_conn.c:2437 hci_dev_close_sync+0x5fb/0x1200 net/bluetooth/hci_sync.c:4850 hci_dev_do_close+0x31/0x70 net/bluetooth/hci_core.c:554 hci_error_reset+0xa2/0x140 net/bluetooth/hci_core.c:1059 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Bluetooth: hci4: Opcode 0x c03 failed: -110