======================================================
WARNING: possible circular locking dependency detected
5.10.226 #1 Not tainted
------------------------------------------------------
syz-executor.3/5453 is trying to acquire lock:
ffff88800e760b78 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}, at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050
but task is already holding lock:
ffffffff8561cc88 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (rfkill_global_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:968 [inline]
__mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109
rfkill_register+0x36/0xa10 net/rfkill/core.c:1016
hci_register_dev+0x42e/0xc00 net/bluetooth/hci_core.c:3774
__vhci_create_device+0x2c8/0x5c0 drivers/bluetooth/hci_vhci.c:129
vhci_create_device drivers/bluetooth/hci_vhci.c:153 [inline]
vhci_open_timeout+0x38/0x50 drivers/bluetooth/hci_vhci.c:310
process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282
worker_thread+0x61d/0x1310 kernel/workqueue.c:2428
kthread+0x38f/0x470 kernel/kthread.c:328
ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298
-> #3 (&data->open_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:968 [inline]
__mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109
vhci_send_frame+0x63/0xa0 drivers/bluetooth/hci_vhci.c:71
hci_send_frame+0x1b9/0x320 net/bluetooth/hci_core.c:4065
hci_sched_acl_pkt net/bluetooth/hci_core.c:4590 [inline]
hci_sched_acl net/bluetooth/hci_core.c:4675 [inline]
hci_tx_work+0xfb4/0x15d0 net/bluetooth/hci_core.c:4741
process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282
worker_thread+0x61d/0x1310 kernel/workqueue.c:2428
kthread+0x38f/0x470 kernel/kthread.c:328
ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298
-> #2 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}:
__flush_work+0x105/0xa90 kernel/workqueue.c:3053
hci_dev_do_close+0x131/0x1240 net/bluetooth/hci_core.c:1745
hci_unregister_dev+0x179/0x460 net/bluetooth/hci_core.c:3854
vhci_release+0x70/0xf0 drivers/bluetooth/hci_vhci.c:345
__fput+0x285/0x9f0 fs/file_table.c:281
task_work_run+0xe2/0x1a0 kernel/task_work.c:185
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0xb6f/0x2600 kernel/exit.c:860
do_group_exit+0x125/0x310 kernel/exit.c:982
get_signal+0x4bc/0x2350 kernel/signal.c:2759
arch_do_signal_or_restart+0x2b7/0x1990 arch/x86/kernel/signal.c:805
handle_signal_work kernel/entry/common.c:145 [inline]
exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
exit_to_user_mode_prepare+0x10f/0x190 kernel/entry/common.c:199
syscall_exit_to_user_mode+0x38/0x1d0 kernel/entry/common.c:274
entry_SYSCALL_64_after_hwframe+0x67/0xd1
-> #1 (&hdev->req_lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:968 [inline]
__mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109
hci_req_sync net/bluetooth/hci_request.c:277 [inline]
bg_scan_update+0x82/0x500 net/bluetooth/hci_request.c:2897
process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282
worker_thread+0x61d/0x1310 kernel/workqueue.c:2428
kthread+0x38f/0x470 kernel/kthread.c:328
ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298
-> #0 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:2988 [inline]
check_prevs_add kernel/locking/lockdep.c:3113 [inline]
validate_chain kernel/locking/lockdep.c:3729 [inline]
__lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4955
lock_acquire kernel/locking/lockdep.c:5566 [inline]
lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531
__flush_work+0x105/0xa90 kernel/workqueue.c:3053
__cancel_work_timer+0x368/0x4c0 kernel/workqueue.c:3144
hci_request_cancel_all+0x73/0x230 net/bluetooth/hci_request.c:3440
hci_dev_do_close+0xd9/0x1240 net/bluetooth/hci_core.c:1733
hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223
rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341
rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240
vfs_write+0x29a/0xb10 fs/read_write.c:603
ksys_write+0x1f6/0x260 fs/read_write.c:658
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x67/0xd1
other info that might help us debug this:
Chain exists of:
(work_completion)(&hdev->bg_scan_update) --> &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((work_completion)(&hdev->bg_scan_update));
*** DEADLOCK ***
1 lock held by syz-executor.3/5453:
#0: ffffffff8561cc88 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232
stack backtrace:
CPU: 0 PID: 5453 Comm: syz-executor.3 Not tainted 5.10.226 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x107/0x167 lib/dump_stack.c:118
check_noncircular+0x263/0x2e0 kernel/locking/lockdep.c:2123
check_prev_add kernel/locking/lockdep.c:2988 [inline]
check_prevs_add kernel/locking/lockdep.c:3113 [inline]
validate_chain kernel/locking/lockdep.c:3729 [inline]
__lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4955
lock_acquire kernel/locking/lockdep.c:5566 [inline]
lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531
__flush_work+0x105/0xa90 kernel/workqueue.c:3053
__cancel_work_timer+0x368/0x4c0 kernel/workqueue.c:3144
hci_request_cancel_all+0x73/0x230 net/bluetooth/hci_request.c:3440
hci_dev_do_close+0xd9/0x1240 net/bluetooth/hci_core.c:1733
hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223
rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341
rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240
vfs_write+0x29a/0xb10 fs/read_write.c:603
ksys_write+0x1f6/0x260 fs/read_write.c:658
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x67/0xd1
RIP: 0033:0x7fdf3aa87b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdf37ffd188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fdf3ab9af60 RCX: 00007fdf3aa87b19
RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00007fdf3aae1f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff9c2ef41f R14: 00007fdf37ffd300 R15: 0000000000022000
device veth0_vlan entered promiscuous mode