====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc4-syzkaller-00895-g0313afe8b83a #0 Not tainted ------------------------------------------------------ syz-executor.0/7500 is trying to acquire lock: ffff88802aaa3130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1725 [inline] ffff88802aaa3130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_del+0x12c/0x2b0 net/bluetooth/sco.c:197 but task is already holding lock: ffffffff8e2eae08 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1790 [inline] ffffffff8e2eae08 (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: -> #2 (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 -> #1 (&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:2001 __sys_connect+0x165/0x1a0 net/socket.c:2018 __do_sys_connect net/socket.c:2028 [inline] __se_sys_connect net/socket.c:2025 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2025 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 -> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{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 lock_sock_nested+0x3a/0xf0 net/core/sock.c:3472 lock_sock include/net/sock.h:1725 [inline] sco_conn_del+0x12c/0x2b0 net/bluetooth/sco.c:197 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_unregister_dev+0x1ce/0x580 net/bluetooth/hci_core.c:2702 vhci_release+0x80/0xf0 drivers/bluetooth/hci_vhci.c:568 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xaa8/0x2950 kernel/exit.c:867 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012 __do_sys_exit_group kernel/exit.c:1023 [inline] __se_sys_exit_group kernel/exit.c:1021 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021 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 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 *** 3 locks held by syz-executor.0/7500: #0: ffff88804d7f1028 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x29/0x70 net/bluetooth/hci_core.c:552 #1: ffff88804d7f0078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x306/0x1200 net/bluetooth/hci_sync.c:4837 #2: ffffffff8e2eae08 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1790 [inline] #2: ffffffff8e2eae08 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xd9/0x260 net/bluetooth/hci_conn.c:2437 stack backtrace: CPU: 1 PID: 7500 Comm: syz-executor.0 Not tainted 6.2.0-rc4-syzkaller-00895-g0313afe8b83a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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 lock_sock_nested+0x3a/0xf0 net/core/sock.c:3472 lock_sock include/net/sock.h:1725 [inline] sco_conn_del+0x12c/0x2b0 net/bluetooth/sco.c:197 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_unregister_dev+0x1ce/0x580 net/bluetooth/hci_core.c:2702 vhci_release+0x80/0xf0 drivers/bluetooth/hci_vhci.c:568 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xaa8/0x2950 kernel/exit.c:867 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012 __do_sys_exit_group kernel/exit.c:1023 [inline] __se_sys_exit_group kernel/exit.c:1021 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021 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 RIP: 0033:0x7f3305e8c0c9 Code: Unable to access opcode bytes at 0x7f3305e8c09f. RSP: 002b:00007ffc8aaa2fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007ffc8aaa3190 RCX: 00007f3305e8c0c9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000043 RBP: 0000000000000000 R08: 0000000000000025 R09: 00007ffc8aaa3190 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3305ee7aba R13: 000000000000001c R14: 0000000000000002 R15: 00007ffc8aaa31d0