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-3,10.128.15.204' (ECDSA) to the list of known hosts. 2017/11/02 11:58:44 parsed 1 programs 2017/11/02 11:58:44 executed programs: 0 syzkaller login: [ 93.815075] ------------[ cut here ]------------ [ 93.815931] WARNING: CPU: 0 PID: 3070 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 93.817201] Kernel panic - not syncing: panic_on_warn set ... [ 93.817201] [ 93.818173] CPU: 0 PID: 3070 Comm: syz-executor4 Not tainted 4.14.0-rc7-next-20171102+ #37 [ 93.819275] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 93.820498] Call Trace: [ 93.820852] [ 93.821157] dump_stack+0x194/0x257 [ 93.821653] ? arch_local_irq_restore+0x53/0x53 [ 93.822286] ? vsnprintf+0x1ed/0x1900 [ 93.822808] panic+0x1e4/0x41c [ 93.823261] ? refcount_error_report+0x214/0x214 [ 93.823896] ? show_regs_print_info+0x65/0x65 [ 93.824510] ? __warn+0x1a9/0x1e0 [ 93.824984] ? free_kthread_struct+0xa2/0xe0 [ 93.825575] __warn+0x1c4/0x1e0 [ 93.826058] ? free_kthread_struct+0xa2/0xe0 [ 93.826687] report_bug+0x211/0x2d0 [ 93.827187] fixup_bug+0x40/0x90 [ 93.827645] do_trap+0x260/0x390 [ 93.828111] do_error_trap+0x120/0x390 [ 93.828633] ? save_stack+0xa3/0xd0 [ 93.829128] ? do_trap+0x390/0x390 [ 93.829626] ? free_kthread_struct+0xa2/0xe0 [ 93.830231] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 93.830885] do_invalid_op+0x1b/0x20 [ 93.831404] invalid_op+0x18/0x20 [ 93.831871] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 93.832538] RSP: 0018:ffff8801db207768 EFLAGS: 00010206 [ 93.833265] RAX: ffff8801ccfb2100 RBX: ffff8801cca7a540 RCX: ffffffff814937d2 [ 93.834289] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801cca7a6c8 [ 93.835263] RBP: ffff8801db207770 R08: ffffffff85f3b680 R09: 1ffff1003b640ed4 [ 93.842506] R10: ffff8801ccfb2100 R11: 0000000000000002 R12: 1ffff1003b640ef0 [ 93.849744] R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0 [ 93.856998] ? free_kthread_struct+0xa2/0xe0 [ 93.861383] ? free_kthread_struct+0xa2/0xe0 [ 93.865761] free_task+0x134/0x1a0 [ 93.869271] ? arch_release_task_struct+0x10/0x10 [ 93.874088] ? atomic_notifier_call_chain+0xb9/0x140 [ 93.879169] __put_task_struct+0x229/0x3b0 [ 93.883376] ? free_task+0x1a0/0x1a0 [ 93.887073] delayed_put_task_struct+0xca/0x3d0 [ 93.891712] ? child_wait_callback+0x210/0x210 [ 93.896260] ? put_pid+0x183/0x1f0 [ 93.899772] ? task_active_pid_ns+0xd0/0xd0 [ 93.904070] ? rcu_process_callbacks+0x115c/0x17d0 [ 93.908969] ? put_pid+0x1f0/0x1f0 [ 93.912478] ? child_wait_callback+0x210/0x210 [ 93.917035] rcu_process_callbacks+0xd74/0x17d0 [ 93.921688] ? rcu_gp_kthread+0x18e0/0x18e0 [ 93.925977] ? print_usage_bug+0x480/0x480 [ 93.930184] ? perf_trace_lock+0xd6/0x900 [ 93.934303] ? timerqueue_add+0x1e9/0x280 [ 93.938442] ? find_held_lock+0x39/0x1d0 [ 93.942491] ? check_noncircular+0x20/0x20 [ 93.946696] ? lock_downgrade+0x990/0x990 [ 93.950823] ? lock_acquire+0x1d5/0x580 [ 93.954769] ? clockevents_program_event+0x163/0x2e0 [ 93.959858] ? __lock_is_held+0xbc/0x140 [ 93.963908] __do_softirq+0x29d/0xbb2 [ 93.967693] ? __irqentry_text_end+0x4/0x4 [ 93.971896] ? do_raw_spin_trylock+0x190/0x190 [ 93.976448] ? do_timer+0x50/0x50 [ 93.979873] ? native_apic_msr_write+0x5c/0x80 [ 93.985220] ? lapic_next_event+0x54/0x80 [ 93.989340] ? clockevents_program_event+0x108/0x2e0 [ 93.994417] ? tick_program_event+0x7f/0xd0 [ 93.998715] ? __lock_is_held+0xbc/0x140 [ 94.002761] irq_exit+0x1d3/0x210 [ 94.006188] smp_apic_timer_interrupt+0x16b/0x700 [ 94.010998] ? smp_reschedule_interrupt+0xe6/0x670 [ 94.015903] ? smp_call_function_single_interrupt+0x640/0x640 [ 94.021755] ? _raw_spin_lock+0x32/0x40 [ 94.025709] ? handle_edge_irq+0x2b4/0x7c0 [ 94.029912] ? task_prio+0x40/0x40 [ 94.033431] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 94.038252] apic_timer_interrupt+0x9d/0xb0 [ 94.042541] [ 94.044748] RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 [ 94.050077] RSP: 0018:ffff8801cd597408 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff11 [ 94.057754] RAX: dffffc0000000000 RBX: ffff8801cd5d7988 RCX: ffffffff8502b708 [ 94.064992] RDX: 1ffff10039abaf31 RSI: ffff8801cd5d7988 RDI: ffff8801cd5d7990 [ 94.072232] RBP: ffff8801cd597458 R08: 0000000000000000 R09: 0000000000000000 [ 94.079473] R10: 0000000000000001 R11: ffffffff8744cca0 R12: ffff8801cd5d7988 [ 94.086713] R13: ffff8801cd5d7988 R14: ffff8801cd5d7988 R15: dffffc0000000000 [ 94.093969] ? plist_check_prev_next+0x128/0x1e0 [ 94.098704] ? plist_check_prev_next+0x114/0x1e0 [ 94.103436] plist_check_list+0x46/0xa0 [ 94.107383] plist_check_head+0xd5/0x130 [ 94.111414] ? plist_check_list+0xa0/0xa0 [ 94.115539] ? find_held_lock+0x39/0x1d0 [ 94.119575] plist_del+0xd7/0x990 [ 94.123005] ? plist_add+0x760/0x760 [ 94.126693] ? lru_cache_add_active_or_unevictable+0x20e/0x540 [ 94.132639] ? pgtable_trans_huge_deposit+0x342/0x6d0 [ 94.137805] ? pudp_huge_clear_flush+0x1f0/0x1f0 [ 94.142536] ? do_raw_spin_trylock+0x190/0x190 [ 94.147087] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 94.152954] ? _cond_resched+0x14/0x30 [ 94.156813] ? clear_huge_page+0x309/0x730 [ 94.161023] ? _raw_spin_unlock+0x22/0x30 [ 94.165141] ? do_huge_pmd_anonymous_page+0xb21/0x1b00 [ 94.170399] __unqueue_futex+0x1b6/0x290 [ 94.174435] ? fault_in_user_writeable+0x90/0x90 [ 94.179172] ? futex_wake+0x32d/0x680 [ 94.182945] ? hrtimer_cancel+0x2e/0x40 [ 94.186896] ? lock_release+0xd70/0xd70 [ 94.190845] mark_wake_futex+0x129/0x1c0 [ 94.194878] ? __unqueue_futex+0x290/0x290 [ 94.199095] futex_wake+0x53c/0x680 [ 94.202702] ? get_futex_key+0x1d50/0x1d50 [ 94.206908] ? perf_trace_lock+0xd6/0x900 [ 94.211034] ? trace_event_raw_event_lock+0x340/0x340 [ 94.216211] do_futex+0x1034/0x20d0 [ 94.219811] ? __pmd_alloc+0x4e0/0x4e0 [ 94.223682] ? exit_robust_list+0x240/0x240 [ 94.227985] ? lock_downgrade+0x990/0x990 [ 94.232133] ? handle_mm_fault+0x410/0x8d0 [ 94.236341] ? memset+0x31/0x40 [ 94.239595] ? __handle_mm_fault+0x39c0/0x39c0 [ 94.244146] ? vmacache_find+0x5f/0x280 [ 94.248090] ? vmacache_update+0xfe/0x130 [ 94.252219] ? up_read+0x1a/0x40 [ 94.255561] ? __do_page_fault+0x3d6/0xc90 [ 94.259776] ? mm_fault_error+0x2c0/0x2c0 [ 94.263894] ? do_gettimeofday+0x190/0x190 [ 94.268109] ? __might_sleep+0x95/0x190 [ 94.272059] ? do_page_fault+0xee/0x720 [ 94.276010] SyS_futex+0x260/0x390 [ 94.279528] ? do_futex+0x20d0/0x20d0 [ 94.283317] ? lockdep_sys_exit+0x47/0xf0 [ 94.287436] ? entry_SYSCALL_64_fastpath+0x5/0xbe [ 94.292250] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 94.297236] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 94.301971] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 94.306693] RIP: 0033:0x452869 [ 94.309850] RSP: 002b:00007ffd05169428 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 94.317529] RAX: ffffffffffffffda RBX: 0000000000758048 RCX: 0000000000452869 [ 94.324767] RDX: 000000000000001e RSI: 0000000000000001 RDI: 0000000000758048 [ 94.332007] RBP: 0000000000000086 R08: 00000000007609c0 R09: 0000000000000000 [ 94.339246] R10: 00007ffd05169500 R11: 0000000000000246 R12: fffffffffffffffe [ 94.346489] R13: 000000002001d000 R14: 0000000000016df8 R15: 0000000000000016 [ 94.353919] Dumping ftrace buffer: [ 94.357500] (ftrace buffer empty) [ 94.361184] Kernel Offset: disabled [ 94.364784] Rebooting in 86400 seconds..