============================================
WARNING: possible recursive locking detected
6.12.0-rc1-syzkaller-g80cb3fb61135 #0 Not tainted
--------------------------------------------
kworker/u9:2/6421 is trying to acquire lock:
ffff0000ef8d3948 ((wq_completion)hci4){+.+.}-{0:0}, at: touch_wq_lockdep_map+0x70/0x164 kernel/workqueue.c:3877

but task is already holding lock:
ffff0000ef8d3948 ((wq_completion)hci4){+.+.}-{0:0}, at: process_one_work+0x628/0x1600 kernel/workqueue.c:3203

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

       CPU0
       ----
  lock((wq_completion)hci4);
  lock((wq_completion)hci4);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by kworker/u9:2/6421:
 #0: ffff0000ef8d3948 ((wq_completion)hci4){+.+.}-{0:0}, at: process_one_work+0x628/0x1600 kernel/workqueue.c:3203
 #1: ffff8000a3ae7c20 ((work_completion)(&hdev->error_reset)){+.+.}-{0:0}, at: process_one_work+0x6bc/0x1600 kernel/workqueue.c:3203

stack backtrace:
CPU: 1 UID: 0 PID: 6421 Comm: kworker/u9:2 Not tainted 6.12.0-rc1-syzkaller-g80cb3fb61135 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: hci4 hci_error_reset
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_deadlock_bug+0x4e8/0x668 kernel/locking/lockdep.c:3037
 check_deadlock kernel/locking/lockdep.c:3089 [inline]
 validate_chain kernel/locking/lockdep.c:3891 [inline]
 __lock_acquire+0x6180/0x77c8 kernel/locking/lockdep.c:5202
 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825
 touch_wq_lockdep_map+0xa8/0x164 kernel/workqueue.c:3880
 __flush_workqueue+0x118/0x1174 kernel/workqueue.c:3922
 drain_workqueue+0xb8/0x32c kernel/workqueue.c:4086
 destroy_workqueue+0xb8/0xdc0 kernel/workqueue.c:5830
 hci_release_dev+0x118/0x11a4 net/bluetooth/hci_core.c:2733
 bt_host_release+0x70/0x88 net/bluetooth/hci_sysfs.c:94
 device_release+0x8c/0x1ac
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x2a8/0x41c lib/kobject.c:737
 put_device+0x28/0x40 drivers/base/core.c:3783
 hci_dev_put include/net/bluetooth/hci_core.h:1581 [inline]
 hci_error_reset+0x160/0x35c net/bluetooth/hci_core.c:1019
 process_one_work+0x7bc/0x1600 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3391
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860