INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 438.262962] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 496.993131] random: crng init done executing program executing program executing program executing program [ 626.631021] INFO: rcu_sched self-detected stall on CPU [ 626.636373] 1-....: (124999 ticks this GP) idle=77e/1/4611686018427387906 softirq=11130/11130 fqs=31243 [ 626.646116] (t=125000 jiffies g=5013 c=5012 q=3) [ 626.651031] NMI backtrace for cpu 1 [ 626.654637] CPU: 1 PID: 4590 Comm: syzkaller664164 Not tainted 4.16.0+ #16 [ 626.661628] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 626.670952] Call Trace: [ 626.673506] [ 626.675636] dump_stack+0x1b9/0x294 [ 626.679240] ? dump_stack_print_info.cold.2+0x52/0x52 [ 626.684408] ? lock_release+0xa10/0xa10 [ 626.688363] nmi_cpu_backtrace.cold.4+0x19/0xce [ 626.693011] ? lapic_can_unplug_cpu.cold.26+0x3f/0x3f [ 626.698183] nmi_trigger_cpumask_backtrace+0x151/0x192 [ 626.703435] arch_trigger_cpumask_backtrace+0x14/0x20 [ 626.708602] rcu_dump_cpu_stacks+0x175/0x1c2 [ 626.712987] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 626.717984] check_cpu_stall.isra.61.cold.80+0x36c/0x59a [ 626.723413] ? print_other_cpu_stall+0x4a0/0x4a0 [ 626.728151] ? debug_check_no_locks_freed+0x310/0x310 [ 626.733314] ? find_held_lock+0x36/0x1c0 [ 626.737353] ? lock_downgrade+0x8e0/0x8e0 [ 626.741476] ? debug_check_no_locks_freed+0x310/0x310 [ 626.746641] ? lock_release+0xa10/0xa10 [ 626.750591] ? graph_lock+0x170/0x170 [ 626.754370] ? graph_lock+0x170/0x170 [ 626.758145] ? graph_lock+0x170/0x170 [ 626.761921] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 626.767433] ? graph_lock+0x170/0x170 [ 626.771209] ? graph_lock+0x170/0x170 [ 626.774989] ? __lock_is_held+0xb5/0x140 [ 626.779040] rcu_check_callbacks+0x21b/0xad0 [ 626.783426] ? rcu_cpu_stall_reset+0x210/0x210 [ 626.787984] ? trace_hardirqs_off+0xd/0x10 [ 626.792203] ? raise_softirq+0x1b2/0x450 [ 626.796240] ? raise_softirq_irqoff+0x310/0x310 [ 626.800884] ? read_boot_clock64+0x70/0x70 [ 626.805097] ? account_guest_time+0x3d0/0x3d0 [ 626.809568] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 626.815082] ? hrtimer_run_queues+0x70/0x300 [ 626.819470] ? run_local_timers+0x168/0x1d0 [ 626.823764] ? timer_clear_idle+0x50/0x50 [ 626.827889] ? account_system_time+0x7f/0xb0 [ 626.832273] ? account_process_tick+0x76/0x240 [ 626.836832] update_process_times+0x2d/0x70 [ 626.841131] tick_sched_handle+0xa0/0x180 [ 626.845254] tick_sched_timer+0x42/0x130 [ 626.849290] __hrtimer_run_queues+0x3e3/0x10a0 [ 626.853848] ? tick_sched_do_timer+0x100/0x100 [ 626.858408] ? hrtimer_start_range_ns+0xd10/0xd10 [ 626.863229] ? pvclock_read_flags+0x160/0x160 [ 626.867701] ? __local_bh_enable+0xef/0x130 [ 626.871998] ? kvm_clock_read+0x25/0x30 [ 626.875953] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 626.880945] ? ktime_get_update_offsets_now+0x3a6/0x570 [ 626.886283] ? do_timer+0x50/0x50 [ 626.889713] ? rcu_nmi_exit+0xd7/0x2b0 [ 626.893577] ? do_raw_spin_lock+0xc1/0x200 [ 626.897788] hrtimer_interrupt+0x286/0x650 [ 626.902013] smp_apic_timer_interrupt+0x15d/0x710 [ 626.906837] ? smp_call_function_single_interrupt+0x650/0x650 [ 626.912696] ? _raw_spin_lock+0x32/0x40 [ 626.916646] ? _raw_spin_unlock+0x22/0x30 [ 626.920772] ? handle_edge_irq+0x330/0x870 [ 626.924982] ? task_prio+0x50/0x50 [ 626.928503] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 626.933321] apic_timer_interrupt+0xf/0x20 [ 626.937524] [ 626.939738] RIP: 0010:snd_pcm_stream_unlock_irq+0xb7/0xf0 [ 626.945243] RSP: 0018:ffff8801bc2eeb60 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 626.952927] RAX: ffff8801b80f0140 RBX: 0000000000000000 RCX: 1ffff1003701e13b [ 626.960170] RDX: 0000000000000000 RSI: ffffffff85a14e10 RDI: ffffffff88b17bf8 [ 626.967412] RBP: ffff8801bc2eeb68 R08: ffff8801b80f09b8 R09: 0000000000000006 [ 626.974656] R10: ffff8801b80f0140 R11: 0000000000000000 R12: 0000000000000004 [ 626.981904] R13: 00000000ffffffe0 R14: ffff8801b82e9240 R15: ffff8801ceb4f200 [ 626.989155] ? snd_pcm_stream_unlock_irq+0xb0/0xf0 [ 626.994062] __snd_pcm_lib_xfer+0x739/0x1d10 [ 626.998445] ? print_usage_bug+0xc0/0xc0 [ 627.002481] ? print_usage_bug+0xc0/0xc0 [ 627.006518] ? lock_release+0xa10/0xa10 [ 627.010468] ? snd_pcm_hw_rule_noresample_func+0x110/0x110 [ 627.016071] ? dummy_proc_read+0x6e0/0x6e0 [ 627.020281] ? pcm_lib_apply_appl_ptr+0x5a0/0x5a0 [ 627.025102] ? mark_held_locks+0xc9/0x160 [ 627.029226] ? retint_kernel+0x10/0x10 [ 627.033088] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 627.038078] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 627.042810] ? retint_kernel+0x10/0x10 [ 627.046677] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 627.052190] ? snd_pcm_oss_prepare+0x87/0x1b0 [ 627.056676] snd_pcm_oss_write3+0xe9/0x220 [ 627.060889] snd_pcm_oss_write2+0x34c/0x460 [ 627.065192] ? snd_pcm_oss_write3+0x220/0x220 [ 627.069670] ? find_held_lock+0x36/0x1c0 [ 627.073707] snd_pcm_oss_sync1+0x332/0x5a0 [ 627.077918] ? snd_pcm_oss_write2+0x460/0x460 [ 627.082393] ? kasan_check_read+0x11/0x20 [ 627.086517] ? rcu_is_watching+0x85/0x140 [ 627.090640] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 627.095810] ? wake_up_q+0x100/0x100 [ 627.099501] ? snd_pcm_format_set_silence+0x203/0x540 [ 627.104668] snd_pcm_oss_sync.isra.29+0x790/0x980 [ 627.109486] ? snd_pcm_oss_sync1+0x5a0/0x5a0 [ 627.113872] ? fsnotify_first_mark+0x330/0x330 [ 627.118430] ? kobject_put+0x8e/0x280 [ 627.122206] snd_pcm_oss_release+0x214/0x290 [ 627.126588] ? snd_pcm_oss_sync.isra.29+0x980/0x980 [ 627.131578] __fput+0x34d/0x890 [ 627.134835] ? fput+0x1a0/0x1a0 [ 627.138091] ? check_same_owner+0x320/0x320 [ 627.142389] ? _raw_spin_unlock_irq+0x27/0x70 [ 627.146860] ____fput+0x15/0x20 [ 627.150116] task_work_run+0x1e4/0x290 [ 627.153979] ? task_work_cancel+0x240/0x240 [ 627.158279] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 627.163790] ? switch_task_namespaces+0xa2/0xd0 [ 627.168438] do_exit+0x1aee/0x2730 [ 627.171953] ? plist_add+0x770/0x770 [ 627.175645] ? mm_update_next_owner+0x980/0x980 [ 627.180292] ? print_usage_bug+0xc0/0xc0 [ 627.184327] ? graph_lock+0x170/0x170 [ 627.188103] ? do_raw_spin_unlock+0x9e/0x2e0 [ 627.192487] ? rcu_note_context_switch+0x710/0x710 [ 627.197391] ? lock_acquire+0x1dc/0x520 [ 627.201340] ? __might_sleep+0x95/0x190 [ 627.205291] ? __lock_acquire+0x7f5/0x5130 [ 627.209505] ? debug_check_no_locks_freed+0x310/0x310 [ 627.214670] ? do_raw_spin_unlock+0x9e/0x2e0 [ 627.219055] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 627.223613] ? kasan_check_write+0x14/0x20 [ 627.227824] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 627.232992] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 627.238507] ? drop_futex_key_refs.isra.13+0x6d/0xe0 [ 627.243583] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 627.249094] ? futex_wait+0x5c1/0x9f0 [ 627.252873] ? futex_wait_setup+0x400/0x400 [ 627.257170] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 627.262336] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 627.267847] ? drop_futex_key_refs.isra.13+0x6d/0xe0 [ 627.272922] ? futex_wake+0x2f6/0x750 [ 627.276697] ? graph_lock+0x170/0x170 [ 627.280474] ? memset+0x31/0x40 [ 627.283730] ? find_held_lock+0x36/0x1c0 [ 627.287769] ? lock_downgrade+0x8e0/0x8e0 [ 627.291895] do_group_exit+0x16f/0x430 [ 627.295759] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 627.300314] ? SyS_exit+0x30/0x30 [ 627.303745] ? _raw_spin_unlock_irq+0x27/0x70 [ 627.308218] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 627.313219] get_signal+0x886/0x1960 [ 627.316914] ? ptrace_notify+0x130/0x130 [ 627.320953] ? lock_downgrade+0x8e0/0x8e0 [ 627.325076] ? kasan_check_read+0x11/0x20 [ 627.329200] ? rcu_is_watching+0x85/0x140 [ 627.333324] ? idr_find+0x44/0x50 [ 627.336759] do_signal+0x98/0x2040 [ 627.340283] ? shmctl_do_lock+0x14d/0xa70 [ 627.344406] ? shmctl_stat+0x6d0/0x6d0 [ 627.348269] ? setup_sigcontext+0x7d0/0x7d0 [ 627.352567] ? ksys_shmctl+0x2e0/0x3f0 [ 627.356430] ? SyS_shmget+0x230/0x230 [ 627.360217] ? exit_to_usermode_loop+0x87/0x310 [ 627.364862] exit_to_usermode_loop+0x28a/0x310 [ 627.369421] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 627.374252] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 627.378807] ? do_syscall_64+0xb7/0x9d0 [ 627.382757] do_syscall_64+0x792/0x9d0 [ 627.386619] ? kasan_check_write+0x14/0x20 [ 627.390831] ? syscall_return_slowpath+0x5c0/0x5c0 [ 627.395733] ? syscall_return_slowpath+0x30f/0x5c0 [ 627.400641] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 627.405982] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 627.410805] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 627.415967] RIP: 0033:0x448029 [ 627.419132] RSP: 002b:00007f7284f83da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 627.426814] RAX: fffffffffffffe00 RBX: 00000000006e59fc RCX: 0000000000448029 [ 627.434058] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006e59fc [ 627.441301] RBP: 00000000006e59f8 R08: 0000000000000000 R09: 0000000000000000 [ 627.448545] R10: 0000000000000000 R11: 0000000000000246 R12: 0100000000000000 [ 627.455788] R13: 7073642f7665642f R14: ffffffffffff8e97 R15: 0000000000000004