======================================================
WARNING: possible circular locking dependency detected
6.6.0-rc7-syzkaller-00151-g56567a20b22b #0 Not tainted
------------------------------------------------------
kworker/1:2/5082 is trying to acquire lock:
ffff0000c62650b8 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:552 [inline]
ffff0000c62650b8 (&hdev->req_lock){+.+.}-{3:3}, at: hci_rfkill_set_block+0xe8/0x20c net/bluetooth/hci_core.c:956

but task is already holding lock:
ffff80008f73e988 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_epo+0x58/0x158 net/rfkill/core.c:462

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (rfkill_global_mutex){+.+.}-{3:3}:
       __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
       rfkill_register+0x44/0x7d4 net/rfkill/core.c:1075
       hci_register_dev+0x3e0/0x954 net/bluetooth/hci_core.c:2656
       __vhci_create_device drivers/bluetooth/hci_vhci.c:437 [inline]
       vhci_create_device+0x358/0x6c4 drivers/bluetooth/hci_vhci.c:478
       vhci_get_user drivers/bluetooth/hci_vhci.c:535 [inline]
       vhci_write+0x318/0x3b8 drivers/bluetooth/hci_vhci.c:615
       call_write_iter include/linux/fs.h:1956 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x628/0x93c fs/read_write.c:584
       ksys_write+0x15c/0x26c fs/read_write.c:637
       __do_sys_write fs/read_write.c:649 [inline]
       __se_sys_write fs/read_write.c:646 [inline]
       __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
       __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
       el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
       el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
       el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

-> #2 (&data->open_mutex){+.+.}-{3:3}:
       __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
       vhci_send_frame+0x8c/0x10c drivers/bluetooth/hci_vhci.c:78
       hci_send_frame+0x1c4/0x35c net/bluetooth/hci_core.c:3039
       hci_sched_acl_pkt net/bluetooth/hci_core.c:3651 [inline]
       hci_sched_acl net/bluetooth/hci_core.c:3736 [inline]
       hci_tx_work+0xba0/0x18e4 net/bluetooth/hci_core.c:3835
       process_one_work+0x694/0x1204 kernel/workqueue.c:2630
       process_scheduled_works kernel/workqueue.c:2703 [inline]
       worker_thread+0x938/0xef4 kernel/workqueue.c:2784
       kthread+0x288/0x310 kernel/kthread.c:388
       ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857

-> #1 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}:
       __flush_work+0xf8/0x1c0 kernel/workqueue.c:3403
       flush_work+0x24/0x38 kernel/workqueue.c:3428
       hci_dev_close_sync+0x1c8/0xf2c net/bluetooth/hci_sync.c:4982
       hci_dev_do_close net/bluetooth/hci_core.c:554 [inline]
       hci_unregister_dev+0x1e8/0x4ac net/bluetooth/hci_core.c:2737
       vhci_release+0x7c/0xd0 drivers/bluetooth/hci_vhci.c:672
       __fput+0x324/0x7f8 fs/file_table.c:384
       ____fput+0x20/0x30 fs/file_table.c:412
       task_work_run+0x230/0x2e0 kernel/task_work.c:180
       exit_task_work include/linux/task_work.h:38 [inline]
       do_exit+0x63c/0x1f58 kernel/exit.c:874
       do_group_exit+0x194/0x22c kernel/exit.c:1024
       get_signal+0x1500/0x15ec kernel/signal.c:2892
       do_signal arch/arm64/kernel/signal.c:1249 [inline]
       do_notify_resume+0x3cc/0x3c94 arch/arm64/kernel/signal.c:1302
       exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline]
       exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline]
       el0_svc+0xa0/0x16c arch/arm64/kernel/entry-common.c:679
       el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
       el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

-> #0 (&hdev->req_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3868 [inline]
       __lock_acquire+0x3370/0x75e8 kernel/locking/lockdep.c:5136
       lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5753
       __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
       hci_dev_do_close net/bluetooth/hci_core.c:552 [inline]
       hci_rfkill_set_block+0xe8/0x20c net/bluetooth/hci_core.c:956
       rfkill_set_block+0x18c/0x37c net/rfkill/core.c:346
       rfkill_epo+0x8c/0x158 net/rfkill/core.c:466
       __rfkill_handle_global_op net/rfkill/input.c:60 [inline]
       rfkill_op_handler+0x170/0x288 net/rfkill/input.c:108
       process_one_work+0x694/0x1204 kernel/workqueue.c:2630
       process_scheduled_works kernel/workqueue.c:2703 [inline]
       worker_thread+0x938/0xef4 kernel/workqueue.c:2784
       kthread+0x288/0x310 kernel/kthread.c:388
       ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857

other info that might help us debug this:

Chain exists of:
  &hdev->req_lock --> &data->open_mutex --> rfkill_global_mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(rfkill_global_mutex);
                               lock(&data->open_mutex);
                               lock(rfkill_global_mutex);
  lock(&hdev->req_lock);

 *** DEADLOCK ***

3 locks held by kworker/1:2/5082:
 #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2603
 #1: ffff80009a937c20 ((rfkill_op_work).work){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2605
 #2: ffff80008f73e988 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_epo+0x58/0x158 net/rfkill/core.c:462

stack backtrace:
CPU: 1 PID: 5082 Comm: kworker/1:2 Not tainted 6.6.0-rc7-syzkaller-00151-g56567a20b22b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: events rfkill_op_handler
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
 __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_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060
 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3868 [inline]
 __lock_acquire+0x3370/0x75e8 kernel/locking/lockdep.c:5136
 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5753
 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
 hci_dev_do_close net/bluetooth/hci_core.c:552 [inline]
 hci_rfkill_set_block+0xe8/0x20c net/bluetooth/hci_core.c:956
 rfkill_set_block+0x18c/0x37c net/rfkill/core.c:346
 rfkill_epo+0x8c/0x158 net/rfkill/core.c:466
 __rfkill_handle_global_op net/rfkill/input.c:60 [inline]
 rfkill_op_handler+0x170/0x288 net/rfkill/input.c:108
 process_one_work+0x694/0x1204 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x938/0xef4 kernel/workqueue.c:2784
 kthread+0x288/0x310 kernel/kthread.c:388
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857