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 '10.128.0.61' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 303.238628] IPVS: ftp: loaded support on port[0] = 21 [ 428.281031] INFO: rcu_sched self-detected stall on CPU [ 428.286370] 1-....: (124999 ticks this GP) idle=622/1/4611686018427387906 softirq=10596/10596 fqs=31239 [ 428.296112] (t=125000 jiffies g=4952 c=4951 q=20) [ 428.301114] NMI backtrace for cpu 1 [ 428.304719] CPU: 1 PID: 4474 Comm: syzkaller631460 Not tainted 4.16.0+ #3 [ 428.311615] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 428.320940] Call Trace: [ 428.323494] [ 428.325674] dump_stack+0x1b9/0x294 [ 428.329282] ? dump_stack_print_info.cold.2+0x52/0x52 [ 428.334509] ? lock_release+0xa10/0xa10 [ 428.338467] nmi_cpu_backtrace.cold.4+0x19/0xce [ 428.343148] ? lapic_can_unplug_cpu.cold.26+0x3f/0x3f [ 428.348316] nmi_trigger_cpumask_backtrace+0x151/0x192 [ 428.353569] arch_trigger_cpumask_backtrace+0x14/0x20 [ 428.358766] rcu_dump_cpu_stacks+0x175/0x1c2 [ 428.363177] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 428.368177] check_cpu_stall.isra.61.cold.80+0x36c/0x59a [ 428.373606] ? print_other_cpu_stall+0x4a0/0x4a0 [ 428.378342] ? debug_check_no_locks_freed+0x310/0x310 [ 428.383508] ? find_held_lock+0x36/0x1c0 [ 428.387547] ? lock_downgrade+0x8e0/0x8e0 [ 428.391676] ? debug_check_no_locks_freed+0x310/0x310 [ 428.396840] ? lock_release+0xa10/0xa10 [ 428.400793] ? graph_lock+0x170/0x170 [ 428.404574] ? graph_lock+0x170/0x170 [ 428.408359] ? graph_lock+0x170/0x170 [ 428.412312] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 428.417827] ? graph_lock+0x170/0x170 [ 428.421605] ? graph_lock+0x170/0x170 [ 428.425391] ? __lock_is_held+0xb5/0x140 [ 428.429435] rcu_check_callbacks+0x21b/0xad0 [ 428.433823] ? rcu_cpu_stall_reset+0x210/0x210 [ 428.438384] ? trace_hardirqs_off+0xd/0x10 [ 428.442614] ? raise_softirq+0x1b2/0x450 [ 428.446652] ? raise_softirq_irqoff+0x310/0x310 [ 428.451331] ? read_boot_clock64+0x70/0x70 [ 428.455560] ? account_guest_time+0x3d0/0x3d0 [ 428.460038] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 428.465552] ? hrtimer_run_queues+0x70/0x300 [ 428.469940] ? run_local_timers+0x168/0x1d0 [ 428.474237] ? timer_clear_idle+0x50/0x50 [ 428.478361] ? account_system_time+0x7f/0xb0 [ 428.482745] ? account_process_tick+0x76/0x240 [ 428.487304] update_process_times+0x2d/0x70 [ 428.491643] tick_sched_handle+0xa0/0x180 [ 428.495772] tick_sched_timer+0x42/0x130 [ 428.499810] __hrtimer_run_queues+0x3e3/0x10a0 [ 428.504378] ? tick_sched_do_timer+0x100/0x100 [ 428.508939] ? hrtimer_start_range_ns+0xd10/0xd10 [ 428.513805] ? pvclock_read_flags+0x160/0x160 [ 428.518284] ? __local_bh_enable+0xef/0x130 [ 428.522583] ? kvm_clock_read+0x25/0x30 [ 428.526534] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 428.531525] ? ktime_get_update_offsets_now+0x3a6/0x570 [ 428.536866] ? do_timer+0x50/0x50 [ 428.540293] ? rcu_nmi_exit+0xd7/0x2b0 [ 428.544159] ? do_raw_spin_lock+0xc1/0x200 [ 428.548372] hrtimer_interrupt+0x286/0x650 [ 428.552606] smp_apic_timer_interrupt+0x15d/0x710 [ 428.557426] ? smp_call_function_single_interrupt+0x650/0x650 [ 428.563287] ? _raw_spin_lock+0x32/0x40 [ 428.567239] ? _raw_spin_unlock+0x22/0x30 [ 428.571384] ? handle_edge_irq+0x330/0x870 [ 428.575610] ? task_prio+0x50/0x50 [ 428.579163] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 428.583984] apic_timer_interrupt+0xf/0x20 [ 428.588192] [ 428.590456] RIP: 0010:__snd_pcm_lib_xfer+0x768/0x1d10 [ 428.595618] RSP: 0018:ffff8801b7b76ea8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 428.603302] RAX: 0000000000000000 RBX: ffffffffffffffe0 RCX: ffffed0036f6edec [ 428.610553] RDX: 0000000000000000 RSI: ffffffff859ff04e RDI: ffffed0036f6edf0 [ 428.617808] RBP: ffff8801b7b77148 R08: ffff8801afeae9b8 R09: 0000000000000006 [ 428.625056] R10: ffff8801afeae140 R11: 0000000000000000 R12: 0000000000000004 [ 428.632306] R13: 00000000ffffffe0 R14: ffff8801af2165c0 R15: ffff8801ceaec000 [ 428.639561] ? __snd_pcm_lib_xfer+0x73e/0x1d10 [ 428.644122] ? __snd_pcm_lib_xfer+0x73e/0x1d10 [ 428.648680] ? print_usage_bug+0xc0/0xc0 [ 428.652719] ? print_usage_bug+0xc0/0xc0 [ 428.656761] ? __lock_acquire+0x7f5/0x5130 [ 428.660971] ? snd_pcm_hw_rule_noresample_func+0x110/0x110 [ 428.666573] ? __bpf_trace_applptr+0x40/0x40 [ 428.670979] ? pcm_lib_apply_appl_ptr+0x5a0/0x5a0 [ 428.675799] ? mark_held_locks+0xc9/0x160 [ 428.679922] ? retint_kernel+0x10/0x10 [ 428.683787] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 428.688783] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 428.693517] ? retint_kernel+0x10/0x10 [ 428.697419] ? snd_pcm_oss_write3+0x17b/0x220 [ 428.701896] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 428.707409] ? snd_pcm_oss_prepare+0x87/0x1b0 [ 428.711880] snd_pcm_oss_write3+0xe9/0x220 [ 428.716096] io_playback_transfer+0x274/0x310 [ 428.720567] ? lock_downgrade+0x8e0/0x8e0 [ 428.724704] snd_pcm_plug_write_transfer+0x36c/0x470 [ 428.729786] ? snd_pcm_plug_client_channels_buf+0x450/0x450 [ 428.735480] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 428.740472] ? snd_pcm_plug_client_channels_buf+0x212/0x450 [ 428.746795] snd_pcm_oss_write2+0x25c/0x460 [ 428.751097] ? snd_pcm_oss_write3+0x220/0x220 [ 428.755632] ? kasan_check_read+0x11/0x20 [ 428.759760] ? do_raw_spin_unlock+0x9e/0x2e0 [ 428.764144] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 428.768705] snd_pcm_oss_sync1+0x332/0x5a0 [ 428.772917] ? snd_pcm_oss_write2+0x460/0x460 [ 428.777446] ? debug_object_active_state+0x2e7/0x4e0 [ 428.782527] ? kasan_check_read+0x11/0x20 [ 428.786653] ? rcu_is_watching+0x85/0x140 [ 428.790778] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 428.795944] ? wake_up_q+0x100/0x100 [ 428.799635] ? snd_pcm_format_set_silence+0x203/0x540 [ 428.804809] snd_pcm_oss_sync.isra.29+0x790/0x980 [ 428.809628] ? snd_pcm_oss_sync1+0x5a0/0x5a0 [ 428.814063] ? fsnotify_first_mark+0x330/0x330 [ 428.818626] snd_pcm_oss_release+0x214/0x290 [ 428.823012] ? snd_pcm_oss_sync.isra.29+0x980/0x980 [ 428.828045] __fput+0x34d/0x890 [ 428.831305] ? fput+0x1a0/0x1a0 [ 428.834559] ? check_same_owner+0x320/0x320 [ 428.838866] ____fput+0x15/0x20 [ 428.842144] task_work_run+0x1e4/0x290 [ 428.846010] ? task_work_cancel+0x240/0x240 [ 428.850317] ? switch_task_namespaces+0xbd/0xd0 [ 428.854964] do_exit+0x1aee/0x2730 [ 428.858482] ? mm_update_next_owner+0x980/0x980 [ 428.863128] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 428.868642] ? snd_pcm_oss_write3+0x1c5/0x220 [ 428.873556] ? debug_check_no_locks_freed+0x310/0x310 [ 428.878724] ? kasan_check_write+0x14/0x20 [ 428.882937] ? __mutex_unlock_slowpath+0x180/0x8a0 [ 428.887845] ? wait_for_completion+0x870/0x870 [ 428.892404] ? lock_release+0xa10/0xa10 [ 428.896358] ? check_same_owner+0x320/0x320 [ 428.900657] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 428.905657] ? __check_object_size+0x95/0x5d9 [ 428.910131] ? __might_sleep+0x95/0x190 [ 428.914084] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 428.919598] ? __radix_tree_lookup+0x3d5/0x6c0 [ 428.924159] ? graph_lock+0x170/0x170 [ 428.927939] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 428.932954] ? __fget_light+0x2ef/0x430 [ 428.936903] ? fget_raw+0x20/0x20 [ 428.940335] ? find_held_lock+0x36/0x1c0 [ 428.944374] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 428.949366] ? __fget_light+0x2ef/0x430 [ 428.953329] ? fget_raw+0x20/0x20 [ 428.956761] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 428.962325] ? sockfd_lookup_light+0xc5/0x160 [ 428.966796] ? __sys_connect+0x1d1/0x4c0 [ 428.970836] ? SyS_accept+0x30/0x30 [ 428.974438] ? fget_raw+0x20/0x20 [ 428.977867] ? __fget_light+0x2ef/0x430 [ 428.981817] ? fget_raw+0x20/0x20 [ 428.985247] ? __sys_setsockopt+0x24f/0x390 [ 428.989548] do_group_exit+0x16f/0x430 [ 428.993416] ? SyS_exit+0x30/0x30 [ 428.996845] ? ksys_ioctl+0x81/0xd0 [ 429.000448] ? do_syscall_64+0xb7/0x9d0 [ 429.004399] ? do_group_exit+0x430/0x430 [ 429.008439] SyS_exit_group+0x1d/0x20 [ 429.012216] do_syscall_64+0x29e/0x9d0 [ 429.016077] ? vmalloc_sync_all+0x30/0x30 [ 429.020203] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 429.025033] ? syscall_return_slowpath+0x5c0/0x5c0 [ 429.029937] ? syscall_return_slowpath+0x30f/0x5c0 [ 429.034861] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 429.040203] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 429.045030] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 429.050201] RIP: 0033:0x4446e9 [ 429.053367] RSP: 002b:00007ffe29466408 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 429.061052] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00000000004446e9 [ 429.068305] RDX: 00000000004446e9 RSI: 0000000000000080 RDI: 0000000000000001 [ 429.075555] RBP: 00000000006cf018 R08: 0000000000000000 R09: 0000000000000000 [ 429.082800] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401ff0 [ 429.090046] R13: 0000000000402080 R14: 0000000000000000 R15: 0000000000000000