Bluetooth: hci2: Opcode 0x0c03 failed: -110
============================================
WARNING: possible recursive locking detected
6.8.0-rc7-syzkaller-g707081b61156 #0 Not tainted
--------------------------------------------
kworker/u5:3/6197 is trying to acquire lock:
ffff0000d5f88938 ((wq_completion)hci2){+.+.}-{0:0}, at: __flush_workqueue+0x120/0x11c4 kernel/workqueue.c:3146

but task is already holding lock:
ffff0000d5f88938 ((wq_completion)hci2){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606

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

       CPU0
       ----
  lock((wq_completion)hci2);
  lock((wq_completion)hci2);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by kworker/u5:3/6197:
 #0: ffff0000d5f88938 ((wq_completion)hci2){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606
 #1: ffff800097fd7c20 ((work_completion)(&hdev->error_reset)){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2608

stack backtrace:
CPU: 0 PID: 6197 Comm: kworker/u5:3 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: hci2 hci_error_reset
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 dump_stack+0x1c/0x28 lib/dump_stack.c:113
 print_deadlock_bug+0x4e4/0x660 kernel/locking/lockdep.c:3012
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain kernel/locking/lockdep.c:3856 [inline]
 __lock_acquire+0x5fe4/0x763c kernel/locking/lockdep.c:5137
 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754
 __flush_workqueue+0x14c/0x11c4 kernel/workqueue.c:3146
 drain_workqueue+0xb8/0x32c kernel/workqueue.c:3311
 destroy_workqueue+0xb8/0xdc4 kernel/workqueue.c:4793
 hci_release_dev+0x118/0x11a0 net/bluetooth/hci_core.c:2775
 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:3747
 hci_dev_put include/net/bluetooth/hci_core.h:1611 [inline]
 hci_error_reset+0x160/0x35c net/bluetooth/hci_core.c:1063
 process_one_work+0x694/0x1204 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2706 [inline]
 worker_thread+0x938/0xef4 kernel/workqueue.c:2787
 kthread+0x288/0x310 kernel/kthread.c:388
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860