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-next-kasan-gce-6,10.128.15.210' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 45.734108] ------------[ cut here ]------------ [ 45.734109] ------------[ cut here ]------------ [ 45.734125] WARNING: CPU: 1 PID: 4966 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 45.734132] Kernel panic - not syncing: panic_on_warn set ... [ 45.734132] [ 45.734138] CPU: 1 PID: 4966 Comm: syzkaller782882 Not tainted 4.14.0-rc7-next-20171103+ #38 [ 45.734142] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.734144] Call Trace: [ 45.734147] [ 45.734155] dump_stack+0x194/0x257 [ 45.734166] ? arch_local_irq_restore+0x53/0x53 [ 45.734180] ? vsnprintf+0x1ed/0x1900 [ 45.734194] panic+0x1e4/0x41c [ 45.734202] ? refcount_error_report+0x214/0x214 [ 45.734209] ? show_regs_print_info+0x65/0x65 [ 45.734229] ? __warn+0x1a9/0x1e0 [ 45.734243] ? free_kthread_struct+0xa2/0xe0 [ 45.734250] __warn+0x1c4/0x1e0 [ 45.734258] ? free_kthread_struct+0xa2/0xe0 [ 45.734269] report_bug+0x211/0x2d0 [ 45.734289] fixup_bug+0x40/0x90 [ 45.734298] do_trap+0x260/0x390 [ 45.734318] do_error_trap+0x120/0x390 [ 45.734326] ? save_stack+0xa3/0xd0 [ 45.734339] ? do_trap+0x390/0x390 [ 45.734363] ? free_kthread_struct+0xa2/0xe0 [ 45.734388] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.734406] do_invalid_op+0x1b/0x20 [ 45.734414] invalid_op+0x18/0x20 [ 45.734421] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 45.734425] RSP: 0018:ffff8801db307768 EFLAGS: 00010206 [ 45.734432] RAX: ffff8801c2b42500 RBX: ffff8801c24c7080 RCX: ffffffff814937d2 [ 45.734437] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801c24c7208 [ 45.734441] RBP: ffff8801db307770 R08: 0000000000000000 R09: 1ffff1003b660ed4 [ 45.734445] R10: ffff8801c2b42500 R11: 0000000000000001 R12: 1ffff1003b660ef0 [ 45.734449] R13: 1ffff1003b660ef4 R14: 0000000000000000 R15: ffff8801db3077e0 [ 45.734470] ? free_kthread_struct+0xa2/0xe0 [ 45.734487] ? free_kthread_struct+0xa2/0xe0 [ 45.734496] free_task+0x134/0x1a0 [ 45.734505] ? arch_release_task_struct+0x10/0x10 [ 45.734523] ? atomic_notifier_call_chain+0xb9/0x140 [ 45.734539] __put_task_struct+0x229/0x3b0 [ 45.734547] ? free_task+0x1a0/0x1a0 [ 45.734574] delayed_put_task_struct+0xca/0x3d0 [ 45.734583] ? child_wait_callback+0x210/0x210 [ 45.734589] ? put_pid+0x183/0x1f0 [ 45.734599] ? task_active_pid_ns+0xd0/0xd0 [ 45.734614] ? rcu_process_callbacks+0x115c/0x17d0 [ 45.734622] ? put_pid+0x1f0/0x1f0 [ 45.734631] ? child_wait_callback+0x210/0x210 [ 45.734642] rcu_process_callbacks+0xd74/0x17d0 [ 45.734667] ? rcu_gp_kthread+0x18e0/0x18e0 [ 45.734678] ? timerqueue_add+0x1e9/0x280 [ 45.734695] ? find_held_lock+0x39/0x1d0 [ 45.734721] ? lock_downgrade+0x990/0x990 [ 45.734740] ? lock_acquire+0x1d5/0x580 [ 45.734748] ? clockevents_program_event+0x163/0x2e0 [ 45.734778] ? rcu_pm_notify+0xc0/0xc0 [ 45.734808] __do_softirq+0x29d/0xbb2 [ 45.734832] ? __irqentry_text_end+0x4/0x4 [ 45.734838] ? do_raw_spin_trylock+0x190/0x190 [ 45.734846] ? do_timer+0x50/0x50 [ 45.734857] ? native_apic_msr_write+0x5c/0x80 [ 45.734867] ? lapic_next_event+0x54/0x80 [ 45.734876] ? clockevents_program_event+0x108/0x2e0 [ 45.734890] ? tick_program_event+0x7f/0xd0 [ 45.734901] ? hrtimer_interrupt+0x489/0x5f0 [ 45.734911] ? rcu_pm_notify+0xc0/0xc0 [ 45.734939] irq_exit+0x1d3/0x210 [ 45.734950] smp_apic_timer_interrupt+0x16b/0x700 [ 45.734958] ? smp_reschedule_interrupt+0xe6/0x670 [ 45.734968] ? smp_call_function_single_interrupt+0x640/0x640 [ 45.734979] ? _raw_spin_lock+0x32/0x40 [ 45.734998] ? handle_edge_irq+0x2b4/0x7c0 [ 45.735006] ? task_prio+0x40/0x40 [ 45.735028] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.735047] apic_timer_interrupt+0x9d/0xb0 [ 45.735051] [ 45.735058] RIP: 0010:_raw_spin_unlock_irqrestore+0x5e/0xba [ 45.735061] RSP: 0018:ffff8801c2a27e10 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11 [ 45.735068] RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 45.735072] RDX: 1ffffffff0bd9671 RSI: 0000000000000001 RDI: 0000000000000286 [ 45.735076] RBP: ffff8801c2a27e20 R08: 0000000000000000 R09: 0000000000000000 [ 45.735080] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801db325e00 [ 45.735084] R13: 000000000000b7d6 R14: ffff8801db325e00 R15: ffff8801c2b42500 [ 45.735122] remove_entity_load_avg+0x1be/0x260 [ 45.735136] task_dead_fair+0x10/0x20 [ 45.735144] finish_task_switch+0x4db/0x740 [ 45.735159] ? preempt_notifier_dec+0x20/0x20 [ 45.735185] schedule_tail+0xe/0x100 [ 45.735194] ret_from_fork+0x8/0x40 [ 45.735199] RIP: 0033:0x4484c9 [ 45.735203] RSP: 002b:00007f8ecceebe70 EFLAGS: 00000202 ORIG_RAX: 0000000000000038 [ 45.735209] RAX: 0000000000000000 RBX: 00007f8ecceec700 RCX: 00000000004484c9 [ 45.735214] RDX: 00007f8ecceec9d0 RSI: 00007f8ecceebe70 RDI: 00000000003d0f00 [ 45.735217] RBP: 00007ffc69807580 R08: 00007f8ecceec700 R09: 00007f8ecceec700 [ 45.735221] R10: 00007f8ecceec9d0 R11: 0000000000000202 R12: 0000000000000000 [ 45.735225] R13: 00007ffc6980757f R14: 00007f8ecceec9c0 R15: 0000000000000000 [ 45.736035] Dumping ftrace buffer: [ 45.736074] (ftrace buffer empty) [ 45.736077] Kernel Offset: disabled [ 46.094335] Rebooting in 86400 seconds..