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 '10.128.0.30' (ECDSA) to the list of known hosts. 2018/04/10 03:00:39 parsed 1 programs 2018/04/10 03:00:39 executed programs: 0 2018/04/10 03:00:44 executed programs: 234 2018/04/10 03:00:49 executed programs: 465 2018/04/10 03:00:54 executed programs: 700 2018/04/10 03:00:59 executed programs: 934 2018/04/10 03:01:04 executed programs: 1162 2018/04/10 03:01:09 executed programs: 1392 2018/04/10 03:01:14 executed programs: 1621 2018/04/10 03:01:19 executed programs: 1863 syzkaller login: [ 206.911775] ================================================================== [ 206.919198] BUG: KMSAN: uninit-value in update_cfs_rq_load_avg+0x1344/0x1aa0 [ 206.926366] CPU: 1 PID: 8 Comm: rcu_sched Not tainted 4.16.0+ #82 [ 206.932572] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 206.941902] Call Trace: [ 206.944471] dump_stack+0x185/0x1d0 [ 206.948080] ? update_cfs_rq_load_avg+0x1344/0x1aa0 [ 206.953076] kmsan_report+0x142/0x240 [ 206.956857] __msan_warning_32+0x6c/0xb0 [ 206.960900] update_cfs_rq_load_avg+0x1344/0x1aa0 [ 206.965726] update_load_avg+0xde6/0x2c20 [ 206.969861] dequeue_task_fair+0x12f/0x2ea0 [ 206.974164] ? __msan_poison_alloca+0x15c/0x1d0 [ 206.978810] ? __schedule+0x132/0x730 [ 206.982592] ? enqueue_task_fair+0x43a0/0x43a0 [ 206.987150] deactivate_task+0x50d/0x780 [ 206.991191] __schedule+0x164/0x730 [ 206.994793] ? schedule+0x1cc/0x2f0 [ 206.998398] schedule+0x1cc/0x2f0 [ 207.001831] schedule_timeout+0x3e7/0x570 [ 207.005960] ? run_local_timers+0x100/0x100 [ 207.010262] rcu_gp_kthread+0x21e1/0x38d0 [ 207.014396] ? rcu_barrier_func+0x120/0x120 [ 207.018693] kthread+0x539/0x720 [ 207.022039] ? rcu_barrier_func+0x120/0x120 [ 207.026343] ? kthread_blkcg+0xf0/0xf0 [ 207.030213] ret_from_fork+0x35/0x40 [ 207.033911] [ 207.035514] Uninit was stored to memory at: [ 207.039816] kmsan_internal_chain_origin+0x12b/0x210 [ 207.044895] __msan_chain_origin+0x69/0xc0 [ 207.049106] enqueue_task_fair+0x15b1/0x43a0 [ 207.053505] try_to_wake_up+0x13cc/0x20a0 [ 207.057630] wake_up_process+0x34/0x40 [ 207.061501] swake_up+0xfb/0x3b0 [ 207.064849] rcu_report_qs_rnp+0x767/0x880 [ 207.069062] rcu_process_callbacks+0x7b0/0x2070 [ 207.073713] __do_softirq+0x56d/0x93d [ 207.077492] Uninit was stored to memory at: [ 207.081791] kmsan_internal_chain_origin+0x12b/0x210 [ 207.086871] __msan_chain_origin+0x69/0xc0 [ 207.091089] reweight_entity+0x1607/0x1a30 [ 207.095312] task_tick_fair+0x5f1/0x1040 [ 207.099351] scheduler_tick+0x28b/0x490 [ 207.103312] update_process_times+0x157/0x1a0 [ 207.107786] tick_sched_timer+0x33b/0x4b0 [ 207.111916] __hrtimer_run_queues+0xc03/0x15d0 [ 207.116473] hrtimer_interrupt+0x426/0xaf0 [ 207.120690] local_apic_timer_interrupt+0x66/0x230 [ 207.125601] smp_apic_timer_interrupt+0x5a/0x90 [ 207.130240] Uninit was stored to memory at: [ 207.134539] kmsan_internal_chain_origin+0x12b/0x210 [ 207.139622] __msan_chain_origin+0x69/0xc0 [ 207.143836] reweight_entity+0x126b/0x1a30 [ 207.148046] task_tick_fair+0x5f1/0x1040 [ 207.152086] scheduler_tick+0x28b/0x490 [ 207.156035] update_process_times+0x157/0x1a0 [ 207.160510] tick_sched_timer+0x33b/0x4b0 [ 207.164635] __hrtimer_run_queues+0xc03/0x15d0 [ 207.169196] hrtimer_interrupt+0x426/0xaf0 [ 207.173408] local_apic_timer_interrupt+0x66/0x230 [ 207.178315] smp_apic_timer_interrupt+0x5a/0x90 [ 207.182958] Local variable description: ----flags.i.i.i.i@_raw_spin_lock_irqsave [ 207.190466] Variable was created at: [ 207.194159] _raw_spin_lock_irqsave+0x45/0xf0 [ 207.198633] hrtimer_interrupt+0x101/0xaf0 [ 207.202840] ================================================================== [ 207.210171] Disabling lock debugging due to kernel taint [ 207.215595] Kernel panic - not syncing: panic_on_warn set ... [ 207.215595] [ 207.222941] CPU: 1 PID: 8 Comm: rcu_sched Tainted: G B 4.16.0+ #82 [ 207.230447] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 207.239774] Call Trace: [ 207.242345] dump_stack+0x185/0x1d0 [ 207.245951] panic+0x39d/0x940 [ 207.249139] ? update_cfs_rq_load_avg+0x1344/0x1aa0 [ 207.254136] kmsan_report+0x238/0x240 [ 207.257916] __msan_warning_32+0x6c/0xb0 [ 207.261956] update_cfs_rq_load_avg+0x1344/0x1aa0 [ 207.266782] update_load_avg+0xde6/0x2c20 [ 207.270919] dequeue_task_fair+0x12f/0x2ea0 [ 207.275223] ? __msan_poison_alloca+0x15c/0x1d0 [ 207.279869] ? __schedule+0x132/0x730 [ 207.283654] ? enqueue_task_fair+0x43a0/0x43a0 [ 207.288213] deactivate_task+0x50d/0x780 [ 207.292257] __schedule+0x164/0x730 [ 207.295860] ? schedule+0x1cc/0x2f0 [ 207.299465] schedule+0x1cc/0x2f0 [ 207.302901] schedule_timeout+0x3e7/0x570 [ 207.307026] ? run_local_timers+0x100/0x100 [ 207.311331] rcu_gp_kthread+0x21e1/0x38d0 [ 207.315464] ? rcu_barrier_func+0x120/0x120 [ 207.319764] kthread+0x539/0x720 [ 207.323112] ? rcu_barrier_func+0x120/0x120 [ 207.327415] ? kthread_blkcg+0xf0/0xf0 [ 207.331284] ret_from_fork+0x35/0x40 [ 208.451540] Shutting down cpus with NMI [ 208.467126] Dumping ftrace buffer: [ 208.470650] (ftrace buffer empty) [ 208.474339] Kernel Offset: disabled [ 208.477942] Rebooting in 86400 seconds..