Bluetooth: hci6: hardware error 0x00 ====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc4-syzkaller-g59caa87f9dfb #0 Not tainted ------------------------------------------------------ kworker/u5:4/5986 is trying to acquire lock: ffff00012ada5130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1697 [inline] ffff00012ada5130 (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: ffff800018355908 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1791 [inline] ffff800018355908 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb8/0x208 net/bluetooth/hci_conn.c:2440 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:1776 [inline] hci_remote_features_evt+0x458/0x8a8 net/bluetooth/hci_event.c:3768 hci_event_func net/bluetooth/hci_event.c:7485 [inline] hci_event_packet+0x644/0xf3c net/bluetooth/hci_event.c:7537 hci_rx_work+0x32c/0x8b8 net/bluetooth/hci_core.c:4058 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 -> #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+0x170/0x838 net/bluetooth/sco.c:593 __sys_connect_file net/socket.c:2001 [inline] __sys_connect+0x268/0x290 net/socket.c:2018 __do_sys_connect net/socket.c:2028 [inline] __se_sys_connect net/socket.c:2025 [inline] __arm64_sys_connect+0x7c/0x94 net/socket.c:2025 __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+0x64/0x198 arch/arm64/kernel/syscall.c:193 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+0x190/0x194 arch/arm64/kernel/entry.S:591 -> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x238/0x718 kernel/locking/lockdep.c:5669 lock_sock_nested+0x78/0x138 net/core/sock.c:3474 lock_sock include/net/sock.h:1697 [inline] sco_conn_del+0xec/0x498 net/bluetooth/sco.c:197 sco_disconn_cfm+0x8c/0xdc net/bluetooth/sco.c:1379 hci_disconn_cfm include/net/bluetooth/hci_core.h:1794 [inline] hci_conn_hash_flush+0x104/0x208 net/bluetooth/hci_conn.c:2440 hci_dev_close_sync+0x894/0xf8c net/bluetooth/hci_sync.c:4893 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline] hci_error_reset+0xd4/0x1e0 net/bluetooth/hci_core.c:1059 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 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/u5:4/5986: #0: ffff0000d1454938 ((wq_completion)hci6){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 kernel/workqueue.c:2363 #1: ffff80001e337c20 ((work_completion)(&hdev->error_reset)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 kernel/workqueue.c:2365 #2: ffff000127ee5028 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:552 [inline] #2: ffff000127ee5028 (&hdev->req_lock){+.+.}-{3:3}, at: hci_error_reset+0xcc/0x1e0 net/bluetooth/hci_core.c:1059 #3: ffff000127ee4078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x39c/0xf8c net/bluetooth/hci_sync.c:4880 #4: ffff800018355908 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1791 [inline] #4: ffff800018355908 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb8/0x208 net/bluetooth/hci_conn.c:2440 stack backtrace: CPU: 0 PID: 5986 Comm: kworker/u5:4 Not tainted 6.3.0-rc4-syzkaller-g59caa87f9dfb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Workqueue: hci6 hci_error_reset Call trace: dump_backtrace+0x1b8/0x1e4 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+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2056 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x238/0x718 kernel/locking/lockdep.c:5669 lock_sock_nested+0x78/0x138 net/core/sock.c:3474 lock_sock include/net/sock.h:1697 [inline] sco_conn_del+0xec/0x498 net/bluetooth/sco.c:197 sco_disconn_cfm+0x8c/0xdc net/bluetooth/sco.c:1379 hci_disconn_cfm include/net/bluetooth/hci_core.h:1794 [inline] hci_conn_hash_flush+0x104/0x208 net/bluetooth/hci_conn.c:2440 hci_dev_close_sync+0x894/0xf8c net/bluetooth/hci_sync.c:4893 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline] hci_error_reset+0xd4/0x1e0 net/bluetooth/hci_core.c:1059 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: hci6: Opcode 0x c03 failed: -110