====================================================== WARNING: possible circular locking dependency detected 6.10.0-syzkaller-04472-g51835949dda3 #0 Not tainted ------------------------------------------------------ syz-executor/5082 is trying to acquire lock: ffff88807f73c078 (&hdev->lock){+.+.}-{3:3}, at: mgmt_remove_adv_monitor_complete+0xaf/0x550 net/bluetooth/mgmt.c:5425 but task is already holding lock: ffff88807f73c690 (&hdev->cmd_sync_work_lock){+.+.}-{3:3}, at: hci_cmd_sync_clear+0x4e/0x220 net/bluetooth/hci_sync.c:654 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&hdev->cmd_sync_work_lock){+.+.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5753 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 hci_cmd_sync_lookup_entry net/bluetooth/hci_sync.c:796 [inline] hci_cmd_sync_queue_once+0x43/0x240 net/bluetooth/hci_sync.c:778 le_conn_complete_evt+0xae1/0x12e0 net/bluetooth/hci_event.c:5775 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5786 hci_event_func net/bluetooth/hci_event.c:7442 [inline] hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7497 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4029 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 (&hdev->lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5136 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5753 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 mgmt_remove_adv_monitor_complete+0xaf/0x550 net/bluetooth/mgmt.c:5425 _hci_cmd_sync_cancel_entry net/bluetooth/hci_sync.c:641 [inline] hci_cmd_sync_clear+0x107/0x220 net/bluetooth/hci_sync.c:656 hci_unregister_dev+0x181/0x510 net/bluetooth/hci_core.c:2695 vhci_release+0x83/0xd0 drivers/bluetooth/hci_vhci.c:666 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:222 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x27f0 kernel/exit.c:877 do_group_exit+0x207/0x2c0 kernel/exit.c:1026 __do_sys_exit_group kernel/exit.c:1037 [inline] __se_sys_exit_group kernel/exit.c:1035 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&hdev->cmd_sync_work_lock); lock(&hdev->lock); lock(&hdev->cmd_sync_work_lock); lock(&hdev->lock); *** DEADLOCK *** 1 lock held by syz-executor/5082: #0: ffff88807f73c690 (&hdev->cmd_sync_work_lock){+.+.}-{3:3}, at: hci_cmd_sync_clear+0x4e/0x220 net/bluetooth/hci_sync.c:654 stack backtrace: CPU: 1 PID: 5082 Comm: syz-executor Not tainted 6.10.0-syzkaller-04472-g51835949dda3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186 check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5136 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5753 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 mgmt_remove_adv_monitor_complete+0xaf/0x550 net/bluetooth/mgmt.c:5425 _hci_cmd_sync_cancel_entry net/bluetooth/hci_sync.c:641 [inline] hci_cmd_sync_clear+0x107/0x220 net/bluetooth/hci_sync.c:656 hci_unregister_dev+0x181/0x510 net/bluetooth/hci_core.c:2695 vhci_release+0x83/0xd0 drivers/bluetooth/hci_vhci.c:666 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:222 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x27f0 kernel/exit.c:877 do_group_exit+0x207/0x2c0 kernel/exit.c:1026 __do_sys_exit_group kernel/exit.c:1037 [inline] __se_sys_exit_group kernel/exit.c:1035 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbc44d75a99 Code: Unable to access opcode bytes at 0x7fbc44d75a6f. RSP: 002b:00007fff46984498 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fbc44de34be RCX: 00007fbc44d75a99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000016 R08: 00007fff46982236 R09: 00007fff46985750 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff46985750 R13: 00007fbc44de344c R14: 000055558413b4a8 R15: 0000000000029969