======================================================
WARNING: possible circular locking dependency detected
6.7.0-rc6-syzkaller-gaafe7ad77b91 #0 Not tainted
------------------------------------------------------
kworker/1:0/23 is trying to acquire lock:
ffff000126380e10 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}, at: __flush_work+0xd0/0x1c0 kernel/workqueue.c:3400
but task is already holding lock:
ffff000126381108 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:552 [inline]
ffff000126381108 (&hdev->req_lock){+.+.}-{3:3}, at: hci_rfkill_set_block+0xe8/0x20c net/bluetooth/hci_core.c:956
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&hdev->req_lock){+.+.}-{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
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:2627
process_scheduled_works kernel/workqueue.c:2700 [inline]
worker_thread+0x938/0xef4 kernel/workqueue.c:2781
kthread+0x288/0x310 kernel/kthread.c:388
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857
-> #2 (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:2658
__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:2020 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x610/0x910 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+0x54/0x158 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
-> #1 (&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:3042
hci_sched_acl_pkt net/bluetooth/hci_core.c:3654 [inline]
hci_sched_acl net/bluetooth/hci_core.c:3739 [inline]
hci_tx_work+0xba0/0x18e4 net/bluetooth/hci_core.c:3838
process_one_work+0x694/0x1204 kernel/workqueue.c:2627
process_scheduled_works kernel/workqueue.c:2700 [inline]
worker_thread+0x938/0xef4 kernel/workqueue.c:2781
kthread+0x288/0x310 kernel/kthread.c:388
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857
-> #0 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137
lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754
__flush_work+0xf8/0x1c0 kernel/workqueue.c:3400
flush_work+0x24/0x38 kernel/workqueue.c:3425
hci_dev_close_sync+0x1c8/0xf30 net/bluetooth/hci_sync.c:4982
hci_dev_do_close net/bluetooth/hci_core.c:554 [inline]
hci_rfkill_set_block+0xf0/0x20c 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:2627
process_scheduled_works kernel/workqueue.c:2700 [inline]
worker_thread+0x938/0xef4 kernel/workqueue.c:2781
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:
(work_completion)(&hdev->tx_work) --> rfkill_global_mutex --> &hdev->req_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&hdev->req_lock);
lock(rfkill_global_mutex);
lock(&hdev->req_lock);
lock((work_completion)(&hdev->tx_work));
*** DEADLOCK ***
4 locks held by kworker/1:0/23:
#0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2600
#1: ffff800093fe7c20 ((rfkill_op_work).work){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2602
#2: ffff80009122cca8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_epo+0x58/0x158 net/rfkill/core.c:462
#3: ffff000126381108 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:552 [inline]
#3: ffff000126381108 (&hdev->req_lock){+.+.}-{3:3}, at: hci_rfkill_set_block+0xe8/0x20c net/bluetooth/hci_core.c:956
stack backtrace:
CPU: 1 PID: 23 Comm: kworker/1:0 Not tainted 6.7.0-rc6-syzkaller-gaafe7ad77b91 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: events rfkill_op_handler
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_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:3869 [inline]
__lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137
lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754
__flush_work+0xf8/0x1c0 kernel/workqueue.c:3400
flush_work+0x24/0x38 kernel/workqueue.c:3425
hci_dev_close_sync+0x1c8/0xf30 net/bluetooth/hci_sync.c:4982
hci_dev_do_close net/bluetooth/hci_core.c:554 [inline]
hci_rfkill_set_block+0xf0/0x20c 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:2627
process_scheduled_works kernel/workqueue.c:2700 [inline]
worker_thread+0x938/0xef4 kernel/workqueue.c:2781
kthread+0x288/0x310 kernel/kthread.c:388
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857