Bluetooth: hci0: Controller not accepting commands anymore: ncmd = 0 Bluetooth: hci0: Injecting HCI hardware error event Bluetooth: hci0: hardware error 0x00 ====================================================== WARNING: possible circular locking dependency detected 6.1.60-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u5:1/4230 is trying to acquire lock: ffff0000c4912130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline] ffff0000c4912130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_del+0xec/0x498 net/bluetooth/sco.c:197 but task is already holding lock: ffff800017f37608 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1796 [inline] ffff800017f37608 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb0/0x27c net/bluetooth/hci_conn.c:2504 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (hci_cb_list_lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 hci_connect_cfm include/net/bluetooth/hci_core.h:1781 [inline] hci_remote_features_evt+0x458/0x8c4 net/bluetooth/hci_event.c:3769 hci_event_func net/bluetooth/hci_event.c:7496 [inline] hci_event_packet+0x748/0x109c net/bluetooth/hci_event.c:7548 hci_rx_work+0x318/0xa68 net/bluetooth/hci_core.c:4093 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 -> #1 (&hdev->lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 sco_sock_connect+0x170/0x84c net/bluetooth/sco.c:593 __sys_connect_file net/socket.c:1993 [inline] __sys_connect+0x268/0x290 net/socket.c:2010 __do_sys_connect net/socket.c:2020 [inline] __se_sys_connect net/socket.c:2017 [inline] __arm64_sys_connect+0x7c/0x94 net/socket.c:2017 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3824 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5048 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5661 lock_sock_nested+0x78/0x138 net/core/sock.c:3475 lock_sock include/net/sock.h:1744 [inline] sco_conn_del+0xec/0x498 net/bluetooth/sco.c:197 sco_disconn_cfm+0x8c/0xdc net/bluetooth/sco.c:1381 hci_disconn_cfm include/net/bluetooth/hci_core.h:1799 [inline] hci_conn_hash_flush+0x104/0x27c net/bluetooth/hci_conn.c:2504 hci_dev_close_sync+0x7e0/0xf1c net/bluetooth/hci_sync.c:4975 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline] hci_error_reset+0xf4/0x248 net/bluetooth/hci_core.c:1059 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 other info that might help us debug this: Chain exists of: sk_lock-AF_BLUETOOTH-BTPROTO_SCO --> &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(sk_lock-AF_BLUETOOTH-BTPROTO_SCO); *** DEADLOCK *** 5 locks held by kworker/u5:1/4230: #0: ffff0000d4d80138 ((wq_completion)hci0){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff80001dc87c20 ((work_completion)(&hdev->error_reset)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 #2: ffff0000d54f10b8 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:552 [inline] #2: ffff0000d54f10b8 (&hdev->req_lock){+.+.}-{3:3}, at: hci_error_reset+0xec/0x248 net/bluetooth/hci_core.c:1059 #3: ffff0000d54f0078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x39c/0xf1c net/bluetooth/hci_sync.c:4962 #4: ffff800017f37608 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1796 [inline] #4: ffff800017f37608 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb0/0x27c net/bluetooth/hci_conn.c:2504 stack backtrace: CPU: 1 PID: 4230 Comm: kworker/u5:1 Not tainted 6.1.60-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Workqueue: hci0 hci_error_reset Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3824 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5048 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5661 lock_sock_nested+0x78/0x138 net/core/sock.c:3475 lock_sock include/net/sock.h:1744 [inline] sco_conn_del+0xec/0x498 net/bluetooth/sco.c:197 sco_disconn_cfm+0x8c/0xdc net/bluetooth/sco.c:1381 hci_disconn_cfm include/net/bluetooth/hci_core.h:1799 [inline] hci_conn_hash_flush+0x104/0x27c net/bluetooth/hci_conn.c:2504 hci_dev_close_sync+0x7e0/0xf1c net/bluetooth/hci_sync.c:4975 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline] hci_error_reset+0xf4/0x248 net/bluetooth/hci_core.c:1059 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864