[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.32' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.014416] [ 31.016340] ====================================================== [ 31.022870] WARNING: possible circular locking dependency detected [ 31.029640] 4.14.212-syzkaller #0 Not tainted [ 31.034333] ------------------------------------------------------ [ 31.041061] syz-executor783/7989 is trying to acquire lock: [ 31.046910] (event_mutex){+.+.}, at: [] perf_trace_destroy+0x23/0xf0 [ 31.055357] [ 31.055357] but task is already holding lock: [ 31.061528] (&event->child_mutex){+.+.}, at: [] perf_event_release_kernel+0x208/0x8a0 [ 31.071374] [ 31.071374] which lock already depends on the new lock. [ 31.071374] [ 31.079819] [ 31.079819] the existing dependency chain (in reverse order) is: [ 31.088201] [ 31.088201] -> #5 (&event->child_mutex){+.+.}: [ 31.095220] __mutex_lock+0xc4/0x1310 [ 31.100619] perf_event_for_each_child+0x82/0x140 [ 31.106336] _perf_ioctl+0x471/0x1a40 [ 31.111055] perf_ioctl+0x55/0x80 [ 31.115839] do_vfs_ioctl+0x75a/0xff0 [ 31.120282] SyS_ioctl+0x7f/0xb0 [ 31.124491] do_syscall_64+0x1d5/0x640 [ 31.129029] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 31.135184] [ 31.135184] -> #4 (&cpuctx_mutex){+.+.}: [ 31.141158] __mutex_lock+0xc4/0x1310 [ 31.145869] perf_event_init_cpu+0xb7/0x170 [ 31.150921] perf_event_init+0x2cc/0x308 [ 31.156052] start_kernel+0x46a/0x770 [ 31.160607] secondary_startup_64+0xa5/0xb0 [ 31.165687] [ 31.165687] -> #3 (pmus_lock){+.+.}: [ 31.170884] __mutex_lock+0xc4/0x1310 [ 31.175817] perf_event_init_cpu+0x2c/0x170 [ 31.181053] cpuhp_invoke_callback+0x1e6/0x1a80 [ 31.186232] _cpu_up+0x219/0x500 [ 31.190162] do_cpu_up+0x9a/0x160 [ 31.194128] smp_init+0x197/0x1ac [ 31.198387] kernel_init_freeable+0x3f4/0x614 [ 31.203617] kernel_init+0xd/0x165 [ 31.208034] ret_from_fork+0x24/0x30 [ 31.212605] [ 31.212605] -> #2 (cpu_hotplug_lock.rw_sem){++++}: [ 31.219239] cpus_read_lock+0x39/0xc0 [ 31.223841] static_key_slow_inc+0xe/0x20 [ 31.229356] tracepoint_add_func+0x517/0x750 [ 31.235148] tracepoint_probe_register+0x8c/0xc0 [ 31.240645] trace_event_reg+0x272/0x330 [ 31.245511] perf_trace_init+0x424/0xa30 [ 31.250262] perf_tp_event_init+0x79/0xf0 [ 31.255719] perf_try_init_event+0x15b/0x1f0 [ 31.261272] perf_event_alloc.part.0+0xe2d/0x2640 [ 31.267354] SyS_perf_event_open+0x67f/0x24b0 [ 31.272389] do_syscall_64+0x1d5/0x640 [ 31.277432] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 31.283611] [ 31.283611] -> #1 (tracepoints_mutex){+.+.}: [ 31.290264] __mutex_lock+0xc4/0x1310 [ 31.295663] tracepoint_probe_register+0x68/0xc0 [ 31.302272] trace_event_reg+0x272/0x330 [ 31.306896] perf_trace_init+0x424/0xa30 [ 31.311671] perf_tp_event_init+0x79/0xf0 [ 31.317419] perf_try_init_event+0x15b/0x1f0 [ 31.324614] perf_event_alloc.part.0+0xe2d/0x2640 [ 31.330377] SyS_perf_event_open+0x67f/0x24b0 [ 31.336551] do_syscall_64+0x1d5/0x640 [ 31.341605] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 31.347549] [ 31.347549] -> #0 (event_mutex){+.+.}: [ 31.353249] lock_acquire+0x170/0x3f0 [ 31.358150] __mutex_lock+0xc4/0x1310 [ 31.363011] perf_trace_destroy+0x23/0xf0 [ 31.368954] _free_event+0x321/0xe20 [ 31.373697] free_event+0x32/0x40 [ 31.378375] perf_event_release_kernel+0x368/0x8a0 [ 31.385039] perf_release+0x33/0x40 [ 31.390544] __fput+0x25f/0x7a0 [ 31.395128] task_work_run+0x11f/0x190 [ 31.399617] do_exit+0xa44/0x2850 [ 31.403687] do_group_exit+0x100/0x2e0 [ 31.408683] get_signal+0x38d/0x1ca0 [ 31.413946] do_signal+0x7c/0x1550 [ 31.421302] exit_to_usermode_loop+0x160/0x200 [ 31.432701] do_syscall_64+0x4a3/0x640 [ 31.439174] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 31.449362] [ 31.449362] other info that might help us debug this: [ 31.449362] [ 31.466848] Chain exists of: [ 31.466848] event_mutex --> &cpuctx_mutex --> &event->child_mutex [ 31.466848] [ 31.478841] Possible unsafe locking scenario: [ 31.478841] [ 31.485862] CPU0 CPU1 [ 31.491019] ---- ---- [ 31.496402] lock(&event->child_mutex); [ 31.500963] lock(&cpuctx_mutex); [ 31.508211] lock(&event->child_mutex); [ 31.516203] lock(event_mutex); [ 31.520864] [ 31.520864] *** DEADLOCK *** [ 31.520864] [ 31.529614] 2 locks held by syz-executor783/7989: [ 31.537284] #0: (&ctx->mutex){+.+.}, at: [] perf_event_release_kernel+0x1fe/0x8a0 [ 31.550536] #1: (&event->child_mutex){+.+.}, at: [] perf_event_release_kernel+0x208/0x8a0 [ 31.563232] [ 31.563232] stack backtrace: [ 31.568562] CPU: 1 PID: 7989 Comm: syz-executor783 Not tainted 4.14.212-syzkaller #0 [ 31.579314] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.590051] Call Trace: [ 31.592882] dump_stack+0x1b2/0x283 [ 31.596642] print_circular_bug.constprop.0.cold+0x2d7/0x41e [ 31.604584] __lock_acquire+0x2e0e/0x3f20 [ 31.609176] ? list_del_event+0x56c/0x870 [ 31.613424] ? trace_hardirqs_on+0x10/0x10 [ 31.619008] ? do_raw_spin_unlock+0x164/0x220 [ 31.625397] ? mark_held_locks+0xa6/0xf0 [ 31.630278] ? perf_group_detach+0x7f0/0x7f0 [ 31.636057] ? generic_exec_single+0x27e/0x420 [ 31.641622] ? generic_exec_single+0x127/0x420 [ 31.646676] lock_acquire+0x170/0x3f0 [ 31.651477] ? perf_trace_destroy+0x23/0xf0 [ 31.656413] ? perf_trace_destroy+0x23/0xf0 [ 31.660916] __mutex_lock+0xc4/0x1310 [ 31.664724] ? perf_trace_destroy+0x23/0xf0 [ 31.670925] ? task_function_call+0xed/0x130 [ 31.681421] ? pmu_dev_release+0x20/0x20 [ 31.688767] ? perf_trace_destroy+0x23/0xf0 [ 31.693378] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 31.700416] ? event_function_call+0x1fa/0x3c0 [ 31.705638] ? event_sched_out+0x11b0/0x11b0 [ 31.710840] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 31.718595] ? perf_tp_event_init+0xf0/0xf0 [ 31.723107] perf_trace_destroy+0x23/0xf0 [ 31.727654] ? perf_tp_event_init+0xf0/0xf0 [ 31.732484] _free_event+0x321/0xe20 [ 31.736207] free_event+0x32/0x40 [ 31.740458] perf_event_release_kernel+0x368/0x8a0 [ 31.745797] ? perf_event_release_kernel+0x8a0/0x8a0 [ 31.752048] perf_release+0x33/0x40 [ 31.755863] __fput+0x25f/0x7a0 [ 31.759459] task_work_run+0x11f/0x190 [ 31.763515] do_exit+0xa44/0x2850 [ 31.767112] ? mm_update_next_owner+0x5b0/0x5b0 [ 31.772840] ? get_signal+0x323/0x1ca0 [ 31.777626] ? lock_acquire+0x170/0x3f0 [ 31.785117] ? lock_downgrade+0x740/0x740 [ 31.790945] do_group_exit+0x100/0x2e0 [ 31.797127] get_signal+0x38d/0x1ca0 [ 31.801563] ? lock_downgrade+0x740/0x740 [ 31.806518] do_signal+0x7c/0x1550 [ 31.810847] ? wait_for_completion_io+0x10/0x10 [ 31.815953] ? perf_event_ctx_lock_nested+0x247/0x2c0 [ 31.822397] ? setup_sigcontext+0x820/0x820 [ 31.827567] ? put_ctx+0xa/0xe0 [ 31.831161] ? _perf_ioctl+0x1a40/0x1a40 [ 31.836311] ? perf_ioctl+0x69/0x80 [ 31.840735] ? do_vfs_ioctl+0xe2/0xff0 [ 31.844886] ? ioctl_preallocate+0x1a0/0x1a0 [ 31.849494] ? lock_downgrade+0x740/0x740 [ 31.853942] ? SyS_futex+0x1da/0x290 [ 31.857970] ? SyS_futex+0x1e3/0x290 [ 31.862225] ? exit_to_usermode_loop+0x41/0x200 executing program [ 31.868010] exit_to_usermode_loop+0x160/0x200 [ 31.873135] do_syscall_64+0x4a3/0x640 [ 31.877475] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 31.883167] RIP: 0033:0x4469b9 [ 31.886979] RSP: 002b:00007f73c1726db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 31.897900] RAX: fffffffffffffe00 RBX: 00000000006dbc38 RCX: 00000000004469b9 [ 31.906668] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc38 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.918109] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 [ 31.926515] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 31.934350] R13: 00007ffd9b71570f R14: 00007f73c17279c0 R15: 20c49ba5e353f7cf executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program