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 'ci-upstream-mmots-kasan-gce-9,10.128.15.223' (ECDSA) to the list of known hosts. 2017/11/04 07:58:24 parsed 1 programs 2017/11/04 07:58:24 executed programs: 0 syzkaller login: [ 35.757134] ------------[ cut here ]------------ [ 35.757924] WARNING: CPU: 0 PID: 3051 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 35.759375] Kernel panic - not syncing: panic_on_warn set ... [ 35.759375] [ 35.760410] CPU: 0 PID: 3051 Comm: syz-executor1 Not tainted 4.14.0-rc5-mm1+ #20 [ 35.761420] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.762687] Call Trace: [ 35.763050] [ 35.763370] dump_stack+0x194/0x257 [ 35.763897] ? arch_local_irq_restore+0x53/0x53 [ 35.764567] ? vsnprintf+0x1ed/0x1900 [ 35.765216] panic+0x1e4/0x41c [ 35.765871] ? refcount_error_report+0x214/0x214 [ 35.766877] ? show_regs_print_info+0x65/0x65 [ 35.767788] ? __warn+0x1a9/0x1e0 [ 35.768281] ? free_kthread_struct+0xa2/0xe0 [ 35.768902] __warn+0x1c4/0x1e0 [ 35.769418] ? free_kthread_struct+0xa2/0xe0 [ 35.770047] report_bug+0x211/0x2d0 [ 35.770564] fixup_bug+0x40/0x90 [ 35.771033] do_trap+0x260/0x390 [ 35.771522] do_error_trap+0x120/0x390 [ 35.772060] ? save_stack+0xa3/0xd0 [ 35.772762] ? do_trap+0x390/0x390 [ 35.773390] ? delayed_put_task_struct+0xca/0x3d0 [ 35.774049] ? free_kthread_struct+0xa2/0xe0 [ 35.774790] ? smp_apic_timer_interrupt+0x16b/0x700 [ 35.775471] ? apic_timer_interrupt+0x9d/0xb0 [ 35.776106] ? debug_lockdep_rcu_enabled.part.3+0x37/0x60 [ 35.776855] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 35.777534] ? ___might_sleep+0x8a/0x470 [ 35.781582] ? __might_sleep+0x95/0x190 [ 35.785544] ? __might_fault+0xab/0x1d0 [ 35.789512] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.794359] do_invalid_op+0x1b/0x20 [ 35.798060] invalid_op+0x18/0x20 [ 35.801508] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 35.806508] RSP: 0018:ffff8801db207768 EFLAGS: 00010206 [ 35.811860] RAX: ffff8801d22ae480 RBX: ffff8801c429c700 RCX: ffffffff8148d7e2 [ 35.819120] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801c429c7b8 [ 35.826382] RBP: ffff8801db207770 R08: 0000000000000001 R09: 1ffff1003b640edc [ 35.833638] R10: ffff8801db2076a8 R11: 0000000000000001 R12: 1ffff1003b640ef0 [ 35.840893] R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0 [ 35.848170] ? free_kthread_struct+0xa2/0xe0 [ 35.852582] ? free_kthread_struct+0xa2/0xe0 [ 35.856978] free_task+0x134/0x1a0 [ 35.860515] ? arch_release_task_struct+0x10/0x10 [ 35.865351] ? atomic_notifier_call_chain+0xb9/0x140 [ 35.870448] __put_task_struct+0x229/0x3b0 [ 35.874684] ? free_task+0x1a0/0x1a0 [ 35.878403] delayed_put_task_struct+0xca/0x3d0 [ 35.883065] ? child_wait_callback+0x210/0x210 [ 35.887632] ? put_pid+0x183/0x1f0 [ 35.891162] ? rcu_pm_notify+0xc0/0xc0 [ 35.895051] ? rcu_process_callbacks+0x115c/0x17d0 [ 35.899979] ? child_wait_callback+0x210/0x210 [ 35.904550] rcu_process_callbacks+0xd74/0x17d0 [ 35.909202] ? note_gp_changes+0x650/0x650 [ 35.913411] ? timerqueue_add+0x1e9/0x280 [ 35.917537] ? enqueue_hrtimer+0x162/0x490 [ 35.921744] ? __remove_hrtimer+0x190/0x190 [ 35.926043] ? find_held_lock+0x35/0x1d0 [ 35.930084] ? lock_downgrade+0x990/0x990 [ 35.934215] ? rcu_pm_notify+0xc0/0xc0 [ 35.938091] __do_softirq+0x2d7/0xb85 [ 35.941866] ? lock_downgrade+0x990/0x990 [ 35.945987] ? __irqentry_text_end+0x4/0x4 [ 35.950189] ? do_raw_spin_trylock+0x190/0x190 [ 35.954741] ? do_timer+0x50/0x50 [ 35.958166] ? native_apic_msr_write+0x5c/0x80 [ 35.962719] ? lapic_next_event+0x54/0x80 [ 35.966839] ? clockevents_program_event+0x108/0x2e0 [ 35.971914] ? tick_program_event+0x7f/0xd0 [ 35.976207] ? hrtimer_interrupt+0x46e/0x5e0 [ 35.980586] ? rcu_pm_notify+0xc0/0xc0 [ 35.984454] irq_exit+0x1cc/0x200 [ 35.987879] smp_apic_timer_interrupt+0x16b/0x700 [ 35.992688] ? smp_reschedule_interrupt+0xe6/0x670 [ 35.997588] ? smp_call_function_single_interrupt+0x640/0x640 [ 36.003443] ? _raw_spin_lock+0x32/0x40 [ 36.007395] ? handle_edge_irq+0x2b4/0x7c0 [ 36.011614] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.016434] apic_timer_interrupt+0x9d/0xb0 [ 36.020734] [ 36.022943] RIP: 0010:debug_lockdep_rcu_enabled.part.3+0x37/0x60 [ 36.029054] RSP: 0018:ffff8801d1cb7cc8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff11 [ 36.036732] RAX: 0000000000000007 RBX: ffff8801d22ae480 RCX: ffffffff819768ae [ 36.043973] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff8801d22aecec [ 36.051214] RBP: ffff8801d1cb7cd0 R08: ffff88021fff901c R09: ffff88021fff9008 [ 36.058453] R10: ffff88021fff9010 R11: ffff88021fff901d R12: 0000000000000000 [ 36.065700] R13: ffffffff851e1880 R14: 0000000000000018 R15: 0000000000000023 [ 36.072956] ? __might_fault+0x9e/0x1d0 [ 36.076913] debug_lockdep_rcu_enabled+0x77/0x90 [ 36.081640] ___might_sleep+0x8a/0x470 [ 36.085503] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 36.091359] ? ktime_get_ts64+0x15f/0x4d0 [ 36.095480] __might_sleep+0x95/0x190 [ 36.099255] ? kvm_clock_get_cycles+0x25/0x30 [ 36.103723] __might_fault+0xab/0x1d0 [ 36.107499] _copy_to_user+0x2c/0xc0 [ 36.112334] put_timespec64+0xef/0x180 [ 36.116192] ? nsecs_to_jiffies+0x30/0x30 [ 36.120323] SyS_clock_gettime+0x12f/0x160 [ 36.124529] ? SyS_clock_settime+0x190/0x190 [ 36.128905] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.133892] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 36.138626] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 36.143348] RIP: 0033:0x45560a [ 36.146506] RSP: 002b:0000000000a6f9f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 [ 36.154182] RAX: ffffffffffffffda RBX: 000000000131f914 RCX: 000000000045560a [ 36.161418] RDX: 0000000000000000 RSI: 0000000000a6fa00 RDI: 0000000000000001 [ 36.168655] RBP: 0000000000000082 R08: 0000000000000001 R09: 000000000131f940 [ 36.175892] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000003f [ 36.183138] R13: 0000000000000013 R14: 0000000000008b34 R15: 0000000000000016 [ 36.190984] Dumping ftrace buffer: [ 36.194559] (ftrace buffer empty) [ 36.198238] Kernel Offset: disabled [ 36.201833] Rebooting in 86400 seconds..