MINIX-fs: deleted inode referenced: 9
======================================================
WARNING: possible circular locking dependency detected
6.1.85-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.1/6011 is trying to acquire lock:
ffff0000d3c08130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1745 [inline]
ffff0000d3c08130 (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:
ffff800017f6d448 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1805 [inline]
ffff800017f6d448 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb0/0x27c 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}:
       __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:1790 [inline]
       hci_remote_features_evt+0x458/0x8c4 net/bluetooth/hci_event.c:3803
       hci_event_func net/bluetooth/hci_event.c:7539 [inline]
       hci_event_packet+0x744/0x109c net/bluetooth/hci_event.c:7591
       hci_rx_work+0x318/0xa68 net/bluetooth/hci_core.c:4130
       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:2006 [inline]
       __sys_connect+0x268/0x290 net/socket.c:2023
       __do_sys_connect net/socket.c:2033 [inline]
       __se_sys_connect net/socket.c:2030 [inline]
       __arm64_sys_connect+0x7c/0x94 net/socket.c:2030
       __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:3825 [inline]
       __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
       lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
       lock_sock_nested+0x78/0x138 net/core/sock.c:3484
       lock_sock include/net/sock.h:1745 [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:1808 [inline]
       hci_conn_hash_flush+0x104/0x27c net/bluetooth/hci_conn.c:2441
       hci_dev_close_sync+0x7e0/0xf6c net/bluetooth/hci_sync.c:5018
       hci_dev_do_close net/bluetooth/hci_core.c:554 [inline]
       hci_unregister_dev+0x1e8/0x4ac net/bluetooth/hci_core.c:2738
       vhci_release+0x7c/0xcc drivers/bluetooth/hci_vhci.c:573
       __fput+0x30c/0x7bc fs/file_table.c:320
       ____fput+0x20/0x30 fs/file_table.c:348
       task_work_run+0x240/0x2f0 kernel/task_work.c:179
       exit_task_work include/linux/task_work.h:38 [inline]
       do_exit+0x554/0x1a88 kernel/exit.c:869
       do_group_exit+0x194/0x22c kernel/exit.c:1019
       __do_sys_exit_group kernel/exit.c:1030 [inline]
       __se_sys_exit_group kernel/exit.c:1028 [inline]
       __wake_up_parent+0x0/0x60 kernel/exit.c:1028
       __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

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.1/6011:
 #0: ffff0000d84ed0b8 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:552 [inline]
 #0: ffff0000d84ed0b8 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x1e0/0x4ac net/bluetooth/hci_core.c:2738
 #1: ffff0000d84ec078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x39c/0xf6c net/bluetooth/hci_sync.c:5005
 #2: ffff800017f6d448 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1805 [inline]
 #2: ffff800017f6d448 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb0/0x27c net/bluetooth/hci_conn.c:2441

stack backtrace:
CPU: 1 PID: 6011 Comm: syz-executor.1 Not tainted 6.1.85-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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/0x5c 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:3825 [inline]
 __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
 lock_sock_nested+0x78/0x138 net/core/sock.c:3484
 lock_sock include/net/sock.h:1745 [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:1808 [inline]
 hci_conn_hash_flush+0x104/0x27c net/bluetooth/hci_conn.c:2441
 hci_dev_close_sync+0x7e0/0xf6c net/bluetooth/hci_sync.c:5018
 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline]
 hci_unregister_dev+0x1e8/0x4ac net/bluetooth/hci_core.c:2738
 vhci_release+0x7c/0xcc drivers/bluetooth/hci_vhci.c:573
 __fput+0x30c/0x7bc fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x240/0x2f0 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x554/0x1a88 kernel/exit.c:869
 do_group_exit+0x194/0x22c kernel/exit.c:1019
 __do_sys_exit_group kernel/exit.c:1030 [inline]
 __se_sys_exit_group kernel/exit.c:1028 [inline]
 __wake_up_parent+0x0/0x60 kernel/exit.c:1028
 __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