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-8,10.128.15.194' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 net.ipv6.conf.syz4.router_solicitations = 0 net.ipv6.conf.syz2.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 49.277075] ------------[ cut here ]------------ [ 49.277871] WARNING: CPU: 0 PID: 3003 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 49.279296] Kernel panic - not syncing: panic_on_warn set ... [ 49.279296] [ 49.280266] CPU: 0 PID: 3003 Comm: syzkaller912836 Not tainted 4.14.0-rc7-next-20171103+ #38 [ 49.281406] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.282653] Call Trace: [ 49.283017] [ 49.283339] dump_stack+0x194/0x257 [ 49.283832] ? arch_local_irq_restore+0x53/0x53 [ 49.284461] ? vsnprintf+0x1ed/0x1900 [ 49.284980] panic+0x1e4/0x41c [ 49.285431] ? refcount_error_report+0x214/0x214 [ 49.286063] ? show_regs_print_info+0x65/0x65 [ 49.286671] ? __warn+0x1a9/0x1e0 [ 49.287142] ? free_kthread_struct+0xa2/0xe0 [ 49.287730] __warn+0x1c4/0x1e0 [ 49.288176] ? free_kthread_struct+0xa2/0xe0 [ 49.288768] report_bug+0x211/0x2d0 [ 49.289264] fixup_bug+0x40/0x90 [ 49.289720] do_trap+0x260/0x390 [ 49.290184] do_error_trap+0x120/0x390 [ 49.290707] ? save_stack+0xa3/0xd0 [ 49.291210] ? do_trap+0x390/0x390 [ 49.291689] ? free_kthread_struct+0xa2/0xe0 [ 49.292289] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.292939] do_invalid_op+0x1b/0x20 [ 49.293456] invalid_op+0x18/0x20 [ 49.293923] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 49.294647] RSP: 0018:ffff8801db207768 EFLAGS: 00010206 [ 49.295358] RAX: ffff8801cf088300 RBX: ffff8801d5138cc0 RCX: ffffffff814937d2 [ 49.296327] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801d5138e48 [ 49.297703] RBP: ffff8801db207770 R08: 0000000000000000 R09: 1ffff1003b640ed4 [ 49.304944] R10: ffff8801cf088300 R11: 0000000000000001 R12: 1ffff1003b640ef0 [ 49.312183] R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0 [ 49.319432] ? free_kthread_struct+0xa2/0xe0 [ 49.323813] ? free_kthread_struct+0xa2/0xe0 [ 49.328189] free_task+0x134/0x1a0 [ 49.331697] ? arch_release_task_struct+0x10/0x10 [ 49.336512] ? atomic_notifier_call_chain+0xb9/0x140 [ 49.341586] __put_task_struct+0x229/0x3b0 [ 49.345789] ? free_task+0x1a0/0x1a0 [ 49.349484] delayed_put_task_struct+0xca/0x3d0 [ 49.354122] ? child_wait_callback+0x210/0x210 [ 49.358669] ? put_pid+0x183/0x1f0 [ 49.362180] ? task_active_pid_ns+0xd0/0xd0 [ 49.366472] ? rcu_process_callbacks+0x115c/0x17d0 [ 49.371367] ? put_pid+0x1f0/0x1f0 [ 49.374873] ? child_wait_callback+0x210/0x210 [ 49.379423] rcu_process_callbacks+0xd74/0x17d0 [ 49.384070] ? rcu_gp_kthread+0x18e0/0x18e0 [ 49.388364] ? timerqueue_add+0x1e9/0x280 [ 49.392486] ? find_held_lock+0x39/0x1d0 [ 49.396534] ? lock_acquire+0x1d5/0x580 [ 49.400479] ? rebalance_domains+0xcc0/0xcc0 [ 49.404865] ? rcu_pm_notify+0xc0/0xc0 [ 49.408736] __do_softirq+0x29d/0xbb2 [ 49.412513] ? __irqentry_text_end+0x4/0x4 [ 49.416714] ? do_raw_spin_trylock+0x190/0x190 [ 49.421265] ? do_timer+0x50/0x50 [ 49.424691] ? native_apic_msr_write+0x5c/0x80 [ 49.429246] ? kvm_clock_get_cycles+0x25/0x30 [ 49.433707] ? lapic_next_event+0x54/0x80 [ 49.437823] ? clockevents_program_event+0x108/0x2e0 [ 49.442899] ? tick_program_event+0x7f/0xd0 [ 49.447195] ? hrtimer_interrupt+0x489/0x5f0 [ 49.451571] ? rcu_pm_notify+0xc0/0xc0 [ 49.455439] irq_exit+0x1d3/0x210 [ 49.458860] smp_apic_timer_interrupt+0x16b/0x700 [ 49.463670] ? smp_reschedule_interrupt+0xe6/0x670 [ 49.468567] ? smp_call_function_single_interrupt+0x640/0x640 [ 49.474420] ? _raw_spin_lock+0x32/0x40 [ 49.478372] ? handle_edge_irq+0x2b4/0x7c0 [ 49.482574] ? task_prio+0x40/0x40 [ 49.486098] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.490917] apic_timer_interrupt+0x9d/0xb0 [ 49.495204] [ 49.497409] RIP: 0010:_raw_spin_unlock_irqrestore+0x5e/0xba [ 49.503104] RSP: 0018:ffff8801ce9572c8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11 [ 49.510781] RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 49.518022] RDX: 1ffffffff0bd9671 RSI: 0000000000000001 RDI: 0000000000000286 [ 49.525261] RBP: ffff8801ce9572d8 R08: ffff8801d4d5a400 R09: 0000000000000000 [ 49.532498] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d4d5aac0 [ 49.539733] R13: ffffffff8529acc0 R14: ffff8801d4d5a398 R15: ffff8801d4d5a300 [ 49.546996] sched_fork+0x44b/0xc00 [ 49.550596] ? sysctl_schedstats+0x5d0/0x5d0 [ 49.554975] ? kmem_cache_alloc_trace+0x459/0x750 [ 49.559785] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 49.564767] ? __lockdep_init_map+0xe4/0x650 [ 49.569146] ? __lockdep_init_map+0xe4/0x650 [ 49.573530] copy_process.part.37+0x1730/0x4b30 [ 49.578182] ? __cleanup_sighand+0x40/0x40 [ 49.582380] ? print_usage_bug+0x480/0x480 [ 49.586589] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 49.591744] ? call_rcu_sched+0x12/0x20 [ 49.595682] ? release_task+0xeb5/0x1a40 [ 49.599721] ? delayed_put_task_struct+0x3d0/0x3d0 [ 49.604625] ? lock_downgrade+0x990/0x990 [ 49.608750] ? __lock_acquire+0x739/0x4770 [ 49.612971] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 49.618126] ? do_wait+0x427/0xa70 [ 49.621638] ? do_raw_spin_trylock+0x190/0x190 [ 49.626184] ? lock_release+0xc80/0xd70 [ 49.630130] ? thread_group_cputime_adjusted+0x9f/0xd0 [ 49.635381] ? find_held_lock+0x39/0x1d0 [ 49.639421] ? lock_downgrade+0x990/0x990 [ 49.643542] ? remove_wait_queue+0x81/0x350 [ 49.647838] ? do_raw_spin_trylock+0x190/0x190 [ 49.652384] ? do_raw_spin_trylock+0x190/0x190 [ 49.656934] ? check_noncircular+0x20/0x20 [ 49.661142] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 49.666211] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 49.671193] ? trace_hardirqs_on+0xd/0x10 [ 49.675313] ? remove_wait_queue+0x1b4/0x350 [ 49.679685] ? add_wait_queue+0x1bb/0x2d0 [ 49.683810] _do_fork+0x1ef/0xfe0 [ 49.687237] ? fork_idle+0x2d0/0x2d0 [ 49.690928] ? __might_fault+0xe0/0x1d0 [ 49.694875] ? lock_release+0xd70/0xd70 [ 49.698817] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 49.704664] ? lock_downgrade+0x990/0x990 [ 49.708788] ? __might_sleep+0x95/0x190 [ 49.712731] ? __might_fault+0x188/0x1d0 [ 49.716762] ? kernel_wait4+0x26e/0x370 [ 49.720705] ? SyS_waitid+0x50/0x50 [ 49.724302] ? task_stopped_code+0x140/0x140 [ 49.728686] SyS_clone+0x37/0x50 [ 49.732022] ? ptregs_sys_rt_sigreturn+0x10/0x10 [ 49.736746] do_syscall_64+0x26c/0x8d0 [ 49.740600] ? kernel_wait4+0x370/0x370 [ 49.744539] ? put_timespec64+0xfc/0x180 [ 49.748569] ? syscall_return_slowpath+0x510/0x510 [ 49.753472] ? entry_SYSCALL_64_fastpath+0x5/0xbe [ 49.758286] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.763098] ? sys_vfork+0x30/0x30 [ 49.766611] entry_SYSCALL64_slow_path+0x25/0x25 [ 49.771334] RIP: 0033:0x44951a [ 49.774489] RSP: 002b:00007fff74b22810 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 [ 49.782165] RAX: ffffffffffffffda RBX: 00007fff74b22810 RCX: 000000000044951a [ 49.789400] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 [ 49.796635] RBP: 00007fff74b22850 R08: 0000000000000bbb R09: 00000000010f0880 [ 49.803871] R10: 00000000010f0b50 R11: 0000000000000246 R12: 0000000000000bbb [ 49.811109] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 49.818549] Dumping ftrace buffer: [ 49.822121] (ftrace buffer empty) [ 49.825798] Kernel Offset: disabled [ 49.829394] Rebooting in 86400 seconds..