syzbot

============================================
WARNING: possible recursive locking detected
6.13.0-rc3-syzkaller-00301-gbcde95ce32b6 #0 Not tainted
--------------------------------------------
syz.4.423/7568 is trying to acquire lock:
ffff888068c48078 (&hdev->lock){+.+.}-{4:4}, at: mgmt_remove_adv_monitor_complete+0x9e/0x2e0 net/bluetooth/mgmt.c:5524

but task is already holding lock:
ffff888068c48078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ab/0x11a0 net/bluetooth/hci_sync.c:5200

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.4.423/7568:
 #0: ffff888068c48d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:480
 #1: ffff888068c48078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ab/0x11a0 net/bluetooth/hci_sync.c:5200
 #2: ffff888068c48690 (&hdev->cmd_sync_work_lock){+.+.}-{4:4}, at: hci_cmd_sync_dequeue+0x50/0x1f0 net/bluetooth/hci_sync.c:887

stack backtrace:
CPU: 1 UID: 0 PID: 7568 Comm: syz.4.423 Not tainted 6.13.0-rc3-syzkaller-00301-gbcde95ce32b6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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+0x2117/0x3c40 kernel/locking/lockdep.c:5226
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735
 mgmt_remove_adv_monitor_complete+0x9e/0x2e0 net/bluetooth/mgmt.c:5524
 _hci_cmd_sync_cancel_entry.constprop.0+0x6c/0x1d0 net/bluetooth/hci_sync.c:645
 hci_cmd_sync_dequeue+0x178/0x1f0 net/bluetooth/hci_sync.c:890
 cmd_complete_rsp+0x46/0x1e0 net/bluetooth/mgmt.c:1469
 mgmt_pending_foreach+0xdf/0x140 net/bluetooth/mgmt_util.c:259
 __mgmt_power_off+0x12a/0x2c0 net/bluetooth/mgmt.c:9550
 hci_dev_close_sync+0xcbb/0x11a0 net/bluetooth/hci_sync.c:5208
 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:482
 hci_dev_close+0x183/0x1e0 net/bluetooth/hci_core.c:507
 hci_sock_ioctl+0x2b5/0x7d0 net/bluetooth/hci_sock.c:1128
 sock_do_ioctl+0x116/0x280 net/socket.c:1209
 sock_ioctl+0x228/0x6c0 net/socket.c:1328
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl fs/ioctl.c:892 [inline]
 __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
 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: 0033:0x7fce98985d29
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:00007fce99732038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fce98b75fa0 RCX: 00007fce98985d29
RDX: 0000000000000000 RSI: 00000000400448ca RDI: 000000000000000e
RBP: 00007fce98a01aa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fce98b75fa0 R15: 00007ffefc6c2228
 </TASK>