program:
r0 = syz_init_net_socket$bt_l2cap(0x1f, 0x2, 0x0)
connect$bt_l2cap(r0, &(0x7f0000000080)={0x1f, 0x0, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x7ff}, 0xe)
r1 = syz_init_net_socket$bt_hidp(0x1f, 0x3, 0x6)
ioctl$sock_bt_hidp_HIDPCONNADD(r1, 0x400448c8, &(0x7f0000000280)={r0, r0, 0xc, 0x0, 0x0, 0x9, 0x1, 0x1, 0x9, 0x9, 0x1, 0x1, 'syz1\x00'})
r2 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1)
ioctl$HCIINQUIRY(r2, 0x400448ca, 0x0) (fail_nth: 7)
[ 84.865251][ T5317] input: Bluetooth HID Boot Protocol Device as /devices/virtual/bluetooth/hci0/hci0:200/input5
[ 84.941226][ T5318] FAULT_INJECTION: forcing a failure.
[ 84.941226][ T5318] name failslab, interval 1, probability 0, space 0, times 1
[ 84.986334][ T5318] CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
[ 84.986353][ T5318] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 84.986360][ T5318] Call Trace:
[ 84.986365][ T5318]
[ 84.986370][ T5318] dump_stack_lvl+0xe8/0x150
[ 84.986455][ T5318] should_fail_ex+0x412/0x560
[ 84.986502][ T5318] should_failslab+0xa8/0x100
[ 84.986515][ T5318] __kmalloc_noprof+0xe8/0x760
[ 84.986531][ T5318] ? kobject_get_path+0xc5/0x2f0
[ 84.986567][ T5318] ? __kasan_kmalloc+0x93/0xb0
[ 84.986585][ T5318] kobject_get_path+0xc5/0x2f0
[ 84.986594][ T5318] ? kobject_uevent_env+0x28c/0x9e0
[ 84.986609][ T5318] kobject_uevent_env+0x2a1/0x9e0
[ 84.986627][ T5318] device_del+0x750/0x8f0
[ 84.986649][ T5318] ? __pfx_device_del+0x10/0x10
[ 84.986661][ T5318] ? do_raw_spin_lock+0x12b/0x2f0
[ 84.986677][ T5318] cdev_device_del+0x27/0xf0
[ 84.986690][ T5318] evdev_disconnect+0x4c/0xb0
[ 84.986703][ T5318] __input_unregister_device+0x3a3/0x640
[ 84.986723][ T5318] input_unregister_device+0x9b/0x100
[ 84.986739][ T5318] hidp_session_remove+0x135/0x260
[ 84.986753][ T5318] l2cap_conn_del+0x249/0x5c0
[ 84.986771][ T5318] ? __pfx_l2cap_disconn_cfm+0x10/0x10
[ 84.986784][ T5318] hci_conn_hash_flush+0x10d/0x260
[ 84.986801][ T5318] hci_dev_close_sync+0x821/0x10e0
[ 84.986818][ T5318] ? __pfx_hci_dev_close_sync+0x10/0x10
[ 84.986829][ T5318] ? lockdep_hardirqs_on+0x7a/0x110
[ 84.986844][ T5318] ? enable_work+0x1fd/0x230
[ 84.986865][ T5318] hci_dev_close+0x108/0x260
[ 84.986878][ T5318] sock_do_ioctl+0x101/0x320
[ 84.986896][ T5318] ? __pfx_sock_do_ioctl+0x10/0x10
[ 84.986910][ T5318] ? __mutex_unlock_slowpath+0x1bd/0x7d0
[ 84.986936][ T5318] sock_ioctl+0x5c6/0x7f0
[ 84.986953][ T5318] ? __pfx_sock_ioctl+0x10/0x10
[ 84.986968][ T5318] ? __fget_files+0x2a/0x420
[ 84.986981][ T5318] ? __fget_files+0x3a0/0x420
[ 84.986993][ T5318] ? __fget_files+0x2a/0x420
[ 84.987007][ T5318] ? bpf_lsm_file_ioctl+0x9/0x20
[ 84.987017][ T5318] ? __pfx_sock_ioctl+0x10/0x10
[ 84.987031][ T5318] __se_sys_ioctl+0xfc/0x170
[ 84.987048][ T5318] do_syscall_64+0x14d/0xf80
[ 84.987061][ T5318] ? trace_irq_disable+0x3b/0x150
[ 84.987075][ T5318] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 84.987087][ T5318] ? clear_bhb_loop+0x40/0x90
[ 84.987106][ T5318] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 84.987117][ T5318] RIP: 0033:0x7fa7d159c799
[ 84.987127][ T5318] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
[ 84.987135][ T5318] RSP: 002b:00007fa7d246f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 84.987148][ T5318] RAX: ffffffffffffffda RBX: 00007fa7d1816090 RCX: 00007fa7d159c799
[ 84.987155][ T5318] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000006
[ 84.987160][ T5318] RBP: 00007fa7d246f090 R08: 0000000000000000 R09: 0000000000000000
[ 84.987166][ T5318] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
[ 84.987171][ T5318] R13: 00007fa7d1816128 R14: 00007fa7d1816090 R15: 00007ffeb404faa8
[ 84.987190][ T5318]
[ 85.127668][ T5295] Bluetooth: hci0: command tx timeout
[ 85.138323][ T5318]
[ 85.139449][ T5318] ======================================================
[ 85.142414][ T5318] WARNING: possible circular locking dependency detected
[ 85.145421][ T5318] syzkaller #0 Not tainted
[ 85.147345][ T5318] ------------------------------------------------------
[ 85.150338][ T5318] syz.0.0/5318 is trying to acquire lock:
[ 85.152802][ T5318] ffff8880124dc840 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0x100/0xc50
[ 85.157589][ T5318]
[ 85.157589][ T5318] but task is already holding lock:
[ 85.160785][ T5318] ffff8880124dcaf8 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5c0
[ 85.164645][ T5318]
[ 85.164645][ T5318] which lock already depends on the new lock.
[ 85.164645][ T5318]
[ 85.169164][ T5318]
[ 85.169164][ T5318] the existing dependency chain (in reverse order) is:
[ 85.173037][ T5318]
[ 85.173037][ T5318] -> #1 (&conn->lock#2){+.+.}-{4:4}:
[ 85.176293][ T5318] __mutex_lock+0x19f/0x1300
[ 85.178558][ T5318] l2cap_info_timeout+0x60/0xa0
[ 85.180866][ T5318] process_scheduled_works+0xb02/0x1830
[ 85.183469][ T5318] worker_thread+0xa50/0xfc0
[ 85.185724][ T5318] kthread+0x388/0x470
[ 85.187702][ T5318] ret_from_fork+0x51e/0xb90
[ 85.189966][ T5318] ret_from_fork_asm+0x1a/0x30
[ 85.192240][ T5318]
[ 85.192240][ T5318] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}:
[ 85.196649][ T5318] __lock_acquire+0x15a5/0x2cf0
[ 85.198999][ T5318] lock_acquire+0xf0/0x2e0
[ 85.201205][ T5318] __flush_work+0x700/0xc50
[ 85.203336][ T5318] __cancel_work_sync+0xbe/0x110
[ 85.205682][ T5318] l2cap_conn_del+0x40f/0x5c0
[ 85.207903][ T5318] hci_conn_hash_flush+0x10d/0x260
[ 85.210473][ T5318] hci_dev_close_sync+0x821/0x10e0
[ 85.212929][ T5318] hci_dev_close+0x108/0x260
[ 85.215235][ T5318] sock_do_ioctl+0x101/0x320
[ 85.217518][ T5318] sock_ioctl+0x5c6/0x7f0
[ 85.219678][ T5318] __se_sys_ioctl+0xfc/0x170
[ 85.221987][ T5318] do_syscall_64+0x14d/0xf80
[ 85.224297][ T5318] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 85.227188][ T5318]
[ 85.227188][ T5318] other info that might help us debug this:
[ 85.227188][ T5318]
[ 85.231980][ T5318] Possible unsafe locking scenario:
[ 85.231980][ T5318]
[ 85.235265][ T5318] CPU0 CPU1
[ 85.237567][ T5318] ---- ----
[ 85.239848][ T5318] lock(&conn->lock#2);
[ 85.241769][ T5318] lock((work_completion)(&(&conn->info_timer)->work));
[ 85.245923][ T5318] lock(&conn->lock#2);
[ 85.248993][ T5318] lock((work_completion)(&(&conn->info_timer)->work));
[ 85.252078][ T5318]
[ 85.252078][ T5318] *** DEADLOCK ***
[ 85.252078][ T5318]
[ 85.255624][ T5318] 5 locks held by syz.0.0/5318:
[ 85.257837][ T5318] #0: ffff888038678ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x260
[ 85.262004][ T5318] #1: ffff8880386780c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x10e0
[ 85.266305][ T5318] #2: ffffffff8fd5b3e8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260
[ 85.270843][ T5318] #3: ffff8880124dcaf8 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5c0
[ 85.274934][ T5318] #4: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x100/0xc50
[ 85.279002][ T5318]
[ 85.279002][ T5318] stack backtrace:
[ 85.281693][ T5318] CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
[ 85.281704][ T5318] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 85.281709][ T5318] Call Trace:
[ 85.281714][ T5318]
[ 85.281718][ T5318] dump_stack_lvl+0xe8/0x150
[ 85.281731][ T5318] print_circular_bug+0x2e1/0x300
[ 85.281743][ T5318] check_noncircular+0x12e/0x150
[ 85.281753][ T5318] __lock_acquire+0x15a5/0x2cf0
[ 85.281763][ T5318] ? do_raw_spin_lock+0x12b/0x2f0
[ 85.281771][ T5318] ? do_raw_spin_unlock+0x4d/0x210
[ 85.281777][ T5318] lock_acquire+0xf0/0x2e0
[ 85.281785][ T5318] ? __flush_work+0x100/0xc50
[ 85.281796][ T5318] ? __flush_work+0x100/0xc50
[ 85.281814][ T5318] __flush_work+0x700/0xc50
[ 85.281827][ T5318] ? __flush_work+0x100/0xc50
[ 85.281840][ T5318] ? __flush_work+0x100/0xc50
[ 85.281850][ T5318] ? __pfx___flush_work+0x10/0x10
[ 85.281863][ T5318] ? __pfx_wq_barrier_func+0x10/0x10
[ 85.281880][ T5318] ? __cancel_work_sync+0x5c/0x110
[ 85.281895][ T5318] __cancel_work_sync+0xbe/0x110
[ 85.281906][ T5318] l2cap_conn_del+0x40f/0x5c0
[ 85.281919][ T5318] ? __pfx_l2cap_disconn_cfm+0x10/0x10
[ 85.281931][ T5318] hci_conn_hash_flush+0x10d/0x260
[ 85.281945][ T5318] hci_dev_close_sync+0x821/0x10e0
[ 85.281957][ T5318] ? __pfx_hci_dev_close_sync+0x10/0x10
[ 85.281967][ T5318] ? lockdep_hardirqs_on+0x7a/0x110
[ 85.281983][ T5318] ? enable_work+0x1fd/0x230
[ 85.281998][ T5318] hci_dev_close+0x108/0x260
[ 85.282010][ T5318] sock_do_ioctl+0x101/0x320
[ 85.282025][ T5318] ? __pfx_sock_do_ioctl+0x10/0x10
[ 85.282037][ T5318] ? __mutex_unlock_slowpath+0x1bd/0x7d0
[ 85.282055][ T5318] sock_ioctl+0x5c6/0x7f0
[ 85.282068][ T5318] ? __pfx_sock_ioctl+0x10/0x10
[ 85.282081][ T5318] ? __fget_files+0x2a/0x420
[ 85.282093][ T5318] ? __fget_files+0x3a0/0x420
[ 85.282104][ T5318] ? __fget_files+0x2a/0x420
[ 85.282116][ T5318] ? bpf_lsm_file_ioctl+0x9/0x20
[ 85.282126][ T5318] ? __pfx_sock_ioctl+0x10/0x10
[ 85.282140][ T5318] __se_sys_ioctl+0xfc/0x170
[ 85.282156][ T5318] do_syscall_64+0x14d/0xf80
[ 85.282171][ T5318] ? trace_irq_disable+0x3b/0x150
[ 85.282184][ T5318] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 85.282195][ T5318] ? clear_bhb_loop+0x40/0x90
[ 85.282206][ T5318] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 85.282216][ T5318] RIP: 0033:0x7fa7d159c799
[ 85.282228][ T5318] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
[ 85.282236][ T5318] RSP: 002b:00007fa7d246f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 85.282249][ T5318] RAX: ffffffffffffffda RBX: 00007fa7d1816090 RCX: 00007fa7d159c799
[ 85.282256][ T5318] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000006
[ 85.282262][ T5318] RBP: 00007fa7d246f090 R08: 0000000000000000 R09: 0000000000000000
[ 85.282268][ T5318] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
[ 85.282273][ T5318] R13: 00007fa7d1816128 R14: 00007fa7d1816090 R15: 00007ffeb404faa8
[ 85.282283][ T5318]
[ 87.142203][ T4662] Bluetooth: hci0: command tx timeout
[ 89.222787][ T4662] Bluetooth: hci0: command tx timeout