====================================================== WARNING: possible circular locking dependency detected 6.1.102-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/5893 is trying to acquire lock: ffff88814a1b6130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1748 [inline] ffff88814a1b6130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_del+0x104/0x300 net/bluetooth/sco.c:201 but task is already holding lock: ffffffff8e64e7c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1805 [inline] ffffffff8e64e7c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb8/0x2a0 net/bluetooth/hci_conn.c:2441 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (hci_cb_list_lock){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 hci_connect_cfm include/net/bluetooth/hci_core.h:1790 [inline] hci_remote_features_evt+0x664/0xab0 net/bluetooth/hci_event.c:3803 hci_event_func net/bluetooth/hci_event.c:7539 [inline] hci_event_packet+0xa9d/0x1510 net/bluetooth/hci_event.c:7591 hci_rx_work+0x3cd/0xce0 net/bluetooth/hci_core.c:4097 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #1 (&hdev->lock){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 sco_sock_connect+0x181/0x8f0 net/bluetooth/sco.c:589 __sys_connect_file net/socket.c:2006 [inline] __sys_connect+0x2c9/0x300 net/socket.c:2023 __do_sys_connect net/socket.c:2033 [inline] __se_sys_connect net/socket.c:2030 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:2030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #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+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 lock_sock_nested+0x44/0x100 net/core/sock.c:3485 lock_sock include/net/sock.h:1748 [inline] sco_conn_del+0x104/0x300 net/bluetooth/sco.c:201 hci_disconn_cfm include/net/bluetooth/hci_core.h:1808 [inline] hci_conn_hash_flush+0x10e/0x2a0 net/bluetooth/hci_conn.c:2441 hci_dev_close_sync+0x9a9/0x1020 net/bluetooth/hci_sync.c:5031 hci_dev_do_close net/bluetooth/hci_core.c:510 [inline] hci_unregister_dev+0x207/0x500 net/bluetooth/hci_core.c:2704 vhci_release+0x7f/0xd0 drivers/bluetooth/hci_vhci.c:573 __fput+0x3f6/0x8d0 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa73/0x26a0 kernel/exit.c:871 do_group_exit+0x202/0x2b0 kernel/exit.c:1021 __do_sys_exit_group kernel/exit.c:1032 [inline] __se_sys_exit_group kernel/exit.c:1030 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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/5893: #0: ffff8880748ad0b8 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:508 [inline] #0: ffff8880748ad0b8 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x1ff/0x500 net/bluetooth/hci_core.c:2704 #1: ffff8880748ac078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x48d/0x1020 net/bluetooth/hci_sync.c:5018 #2: ffffffff8e64e7c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1805 [inline] #2: ffffffff8e64e7c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb8/0x2a0 net/bluetooth/hci_conn.c:2441 stack backtrace: CPU: 0 PID: 5893 Comm: syz-executor Not tainted 6.1.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 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+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 lock_sock_nested+0x44/0x100 net/core/sock.c:3485 lock_sock include/net/sock.h:1748 [inline] sco_conn_del+0x104/0x300 net/bluetooth/sco.c:201 hci_disconn_cfm include/net/bluetooth/hci_core.h:1808 [inline] hci_conn_hash_flush+0x10e/0x2a0 net/bluetooth/hci_conn.c:2441 hci_dev_close_sync+0x9a9/0x1020 net/bluetooth/hci_sync.c:5031 hci_dev_do_close net/bluetooth/hci_core.c:510 [inline] hci_unregister_dev+0x207/0x500 net/bluetooth/hci_core.c:2704 vhci_release+0x7f/0xd0 drivers/bluetooth/hci_vhci.c:573 __fput+0x3f6/0x8d0 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa73/0x26a0 kernel/exit.c:871 do_group_exit+0x202/0x2b0 kernel/exit.c:1021 __do_sys_exit_group kernel/exit.c:1032 [inline] __se_sys_exit_group kernel/exit.c:1030 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f8aff3773b9 Code: Unable to access opcode bytes at 0x7f8aff37738f. RSP: 002b:00007ffca8a304d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f8aff3e47a9 RCX: 00007f8aff3773b9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000002 R08: 00007ffca8a2e277 R09: 00007ffca8a31790 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffca8a31790 R13: 00007f8aff3e4784 R14: 0000000000039523 R15: 00007ffca8a32850