============================================
WARNING: possible recursive locking detected
6.12.0-rc5-syzkaller-00005-ge42b1a9a2557 #0 Not tainted
--------------------------------------------
syz.3.737/9278 is trying to acquire lock:
ffff88801f980078 (&hdev->lock){+.+.}-{3:3}, at: mgmt_remove_adv_monitor_complete+0x9e/0x2e0 net/bluetooth/mgmt.c:5454

but task is already holding lock:
ffff88801f980078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x3ab/0x11b0 net/bluetooth/hci_sync.c:5189

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&hdev->lock);
  lock(&hdev->lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz.3.737/9278:
 #0: ffff88801f980d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:481
 #1: ffff88801f980078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x3ab/0x11b0 net/bluetooth/hci_sync.c:5189
 #2: ffff88801f980690 (&hdev->cmd_sync_work_lock){+.+.}-{3:3}, at: hci_cmd_sync_dequeue+0x50/0x1f0 net/bluetooth/hci_sync.c:883

stack backtrace:
CPU: 3 UID: 0 PID: 9278 Comm: syz.3.737 Not tainted 6.12.0-rc5-syzkaller-00005-ge42b1a9a2557 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_deadlock_bug+0x2e3/0x410 kernel/locking/lockdep.c:3037
 check_deadlock kernel/locking/lockdep.c:3089 [inline]
 validate_chain kernel/locking/lockdep.c:3891 [inline]
 __lock_acquire+0x2185/0x3ce0 kernel/locking/lockdep.c:5202
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
 mgmt_remove_adv_monitor_complete+0x9e/0x2e0 net/bluetooth/mgmt.c:5454
 _hci_cmd_sync_cancel_entry.constprop.0+0x6c/0x1d0 net/bluetooth/hci_sync.c:641
 hci_cmd_sync_dequeue+0x178/0x1f0 net/bluetooth/hci_sync.c:886
 cmd_complete_rsp+0x46/0x1e0 net/bluetooth/mgmt.c:1461
 mgmt_pending_foreach+0xdf/0x140 net/bluetooth/mgmt_util.c:259
 __mgmt_power_off+0x12a/0x2c0 net/bluetooth/mgmt.c:9474
 hci_dev_close_sync+0xcbb/0x11b0 net/bluetooth/hci_sync.c:5197
 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:483
 hci_dev_close+0x183/0x1e0 net/bluetooth/hci_core.c:508
 hci_sock_ioctl+0x28c/0x880 net/bluetooth/hci_sock.c:1128
 sock_do_ioctl+0x116/0x280 net/socket.c:1227
 sock_ioctl+0x228/0x6c0 net/socket.c:1346
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x18f/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc92bf7e719
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc92cd1a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc92c135f80 RCX: 00007fc92bf7e719
RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000004
RBP: 00007fc92bff132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc92c135f80 R15: 00007fffdfb064b8
 </TASK>