Bluetooth: hci1: Opcode 0x0c03 failed: -110
============================================
WARNING: possible recursive locking detected
6.8.0-rc7-syzkaller #0 Not tainted
--------------------------------------------
kworker/u17:1/4612 is trying to acquire lock:
ffff888011404138 ((wq_completion)hci1){+.+.}-{0:0}, at: __flush_workqueue+0x141/0x1340 kernel/workqueue.c:3146

but task is already holding lock:
ffff888011404138 ((wq_completion)hci1){+.+.}-{0:0}, at: process_one_work+0x789/0x15e0 kernel/workqueue.c:2608

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

       CPU0
       ----
  lock((wq_completion)hci1);
  lock((wq_completion)hci1);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by kworker/u17:1/4612:
 #0: ffff888011404138 ((wq_completion)hci1){+.+.}-{0:0}, at: process_one_work+0x789/0x15e0 kernel/workqueue.c:2608
 #1: ffffc90002f9fd80 ((work_completion)(&hdev->error_reset)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15e0 kernel/workqueue.c:2609

stack backtrace:
CPU: 0 PID: 4612 Comm: kworker/u17:1 Not tainted 6.8.0-rc7-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: hci1 hci_error_reset
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain kernel/locking/lockdep.c:3856 [inline]
 __lock_acquire+0x2111/0x3b40 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
 __flush_workqueue+0x14b/0x1340 kernel/workqueue.c:3146
 drain_workqueue+0x18f/0x3d0 kernel/workqueue.c:3311
 destroy_workqueue+0xc3/0xb10 kernel/workqueue.c:4793
 hci_release_dev+0x14e/0x620 net/bluetooth/hci_core.c:2775
 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:94
 device_release+0xa1/0x240 drivers/base/core.c:2499
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1fa/0x5b0 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3747
 process_one_work+0x889/0x15e0 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2706 [inline]
 worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787
 kthread+0x2c6/0x3b0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
 </TASK>