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-5,10.128.0.56' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 49.889124] ------------[ cut here ]------------ [ 49.894049] WARNING: CPU: 0 PID: 8715 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 49.902709] Kernel panic - not syncing: panic_on_warn set ... [ 49.902709] [ 49.910065] CPU: 0 PID: 8715 Comm: syzkaller001407 Not tainted 4.14.0-rc2-next-20170927+ #30 [ 49.918630] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.927975] Call Trace: [ 49.930553] [ 49.932704] dump_stack+0x194/0x257 executing program executing program [ 49.936347] ? arch_local_irq_restore+0x53/0x53 [ 49.941038] panic+0x1e4/0x417 [ 49.944233] ? __warn+0x1d9/0x1d9 [ 49.947680] ? show_regs_print_info+0x65/0x65 [ 49.952206] ? free_kthread_struct+0xa2/0xe0 [ 49.956613] __warn+0x1c4/0x1d9 [ 49.960061] ? free_kthread_struct+0xa2/0xe0 [ 49.964471] report_bug+0x211/0x2d0 [ 49.968103] fixup_bug+0x40/0x90 [ 49.971472] do_trap+0x260/0x390 [ 49.974851] do_error_trap+0x120/0x390 [ 49.978737] ? do_trap+0x390/0x390 [ 49.982262] ? find_held_lock+0x39/0x1d0 executing program [ 49.986316] ? free_kthread_struct+0xa2/0xe0 [ 49.990742] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.995595] do_invalid_op+0x1b/0x20 [ 49.999305] invalid_op+0x18/0x20 [ 50.002753] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 50.007781] RSP: 0000:ffff8801db207710 EFLAGS: 00010206 [ 50.013142] RAX: ffff8801cd8e43c0 RBX: ffff8801d0c250c0 RCX: 1ffff1003b640ed6 [ 50.020404] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801d0c25248 [ 50.027666] RBP: ffff8801db207718 R08: 0000000000000000 R09: 1ffff1003b640ec9 executing program executing program executing program [ 50.034927] R10: ffff8801cd8e43c0 R11: 0000000000000003 R12: 1ffff1003b640ee5 [ 50.042188] R13: 1ffff1003b640ee9 R14: 0000000000000000 R15: ffff8801db207788 [ 50.049506] free_task+0x134/0x1a0 [ 50.053047] ? arch_release_task_struct+0x10/0x10 [ 50.057902] ? atomic_notifier_call_chain+0xb9/0x140 [ 50.063017] __put_task_struct+0x240/0x5b0 [ 50.067252] ? free_task+0x1a0/0x1a0 [ 50.070969] ? __lock_is_held+0xbc/0x140 [ 50.075056] delayed_put_task_struct+0xca/0x3d0 [ 50.079722] ? child_wait_callback+0x210/0x210 [ 50.084304] ? file_free_rcu+0x5c/0x70 [ 50.088191] ? task_active_pid_ns+0xd0/0xd0 [ 50.092517] ? rcu_read_lock_sched_held+0x108/0x120 [ 50.097530] ? kmem_cache_free+0x249/0x280 [ 50.101758] ? put_pid+0x1f0/0x1f0 [ 50.105292] ? child_wait_callback+0x210/0x210 [ 50.109874] rcu_process_callbacks+0xd74/0x17d0 [ 50.114565] ? note_gp_changes+0x650/0x650 [ 50.118800] ? print_usage_bug+0x480/0x480 [ 50.123030] ? perf_trace_lock+0x860/0x860 [ 50.127273] ? find_held_lock+0x39/0x1d0 [ 50.131353] ? check_noncircular+0x20/0x20 [ 50.135581] ? lock_downgrade+0x990/0x990 executing program executing program executing program [ 50.139742] ? lock_acquire+0x1d5/0x580 [ 50.143710] ? clockevents_program_event+0x163/0x2e0 [ 50.148837] ? __lock_is_held+0xbc/0x140 [ 50.152925] __do_softirq+0x29d/0xbb2 [ 50.156741] ? __irqentry_text_end+0x4/0x4 [ 50.160968] ? do_raw_spin_trylock+0x190/0x190 [ 50.165548] ? do_timer+0x50/0x50 [ 50.169001] ? native_apic_msr_write+0x5c/0x80 [ 50.173582] ? lapic_next_event+0x54/0x80 [ 50.177727] ? clockevents_program_event+0x108/0x2e0 [ 50.182833] ? tick_program_event+0x7f/0xd0 [ 50.187149] ? __lock_is_held+0xbc/0x140 [ 50.191229] irq_exit+0x1d3/0x210 [ 50.194662] smp_apic_timer_interrupt+0x16b/0x700 [ 50.199479] ? smp_call_function_single_interrupt+0x640/0x640 [ 50.205338] ? _raw_spin_lock+0x32/0x40 [ 50.209297] ? handle_edge_irq+0x2b4/0x7c0 [ 50.213524] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.218352] apic_timer_interrupt+0x9d/0xb0 [ 50.222644] [ 50.224855] RIP: 0010:_raw_spin_unlock_irqrestore+0x5e/0xba [ 50.230539] RSP: 0000:ffff8801d4a775f0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11 [ 50.238227] RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000006 [ 50.245471] RDX: 1ffffffff0b59705 RSI: 1ffff10039b1c997 RDI: 0000000000000286 [ 50.252713] RBP: ffff8801d4a77600 R08: ffffea0006d898e0 R09: 0000000000000000 [ 50.259956] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88021fffd680 [ 50.267205] R13: ffff8801db21fb20 R14: 000000000000000e R15: dffffc0000000000 [ 50.274495] pagevec_lru_move_fn+0x178/0x260 [ 50.278881] ? get_kernel_page+0x110/0x110 [ 50.283099] __lru_cache_add+0x29f/0x410 [ 50.287139] ? __pagevec_lru_add+0x30/0x30 [ 50.291358] ? get_mem_cgroup_from_mm+0x49b/0x710 [ 50.296182] ? lock_page_memcg+0x3b0/0x3b0 [ 50.300397] ? perf_trace_lock_acquire+0xfe/0x900 [ 50.305213] ? __lock_is_held+0xbc/0x140 [ 50.309258] lru_cache_add+0x1c7/0x3a0 [ 50.313116] ? get_mem_cgroup_from_mm+0x710/0x710 [ 50.317931] ? lru_cache_add_file+0x20/0x20 [ 50.322229] ? __mem_cgroup_threshold+0x8f0/0x8f0 [ 50.327055] ? mark_held_locks+0xb2/0x100 [ 50.331188] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 50.336191] lru_cache_add_active_or_unevictable+0x209/0x540 [ 50.341966] ? add_page_to_unevictable_list+0x730/0x730 [ 50.347301] ? __handle_mm_fault+0x2780/0x39c0 [ 50.351866] ? lock_release+0xd70/0xd70 [ 50.355815] ? lockdep_init_map+0x3d/0x70 [ 50.359961] __handle_mm_fault+0x2973/0x39c0 [ 50.364352] ? __pmd_alloc+0x4e0/0x4e0 [ 50.368225] ? lock_downgrade+0x990/0x990 [ 50.372359] ? __lock_is_held+0xbc/0x140 [ 50.376445] handle_mm_fault+0x334/0x8d0 [ 50.380478] ? down_read_trylock+0xdb/0x170 [ 50.384774] ? __do_page_fault+0x31e/0xd60 [ 50.388982] ? __handle_mm_fault+0x39c0/0x39c0 [ 50.393540] ? vmacache_find+0x5f/0x280 [ 50.397489] ? vmacache_update+0xfe/0x130 [ 50.401614] ? find_vma+0x30/0x150 [ 50.405132] __do_page_fault+0x5bd/0xd60 [ 50.409167] ? security_mmap_file+0x143/0x180 [ 50.413650] ? mm_fault_error+0x2c0/0x2c0 [ 50.417787] do_page_fault+0xee/0x720 [ 50.421564] ? __do_page_fault+0xd60/0xd60 [ 50.425788] ? SyS_mmap_pgoff+0x243/0x5f0 [ 50.429914] ? entry_SYSCALL_64_fastpath+0x4b/0xbe [ 50.434826] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.439653] page_fault+0x22/0x30 [ 50.443078] RIP: 0033:0x40323f [ 50.446242] RSP: 002b:00007ffff2f0f7a0 EFLAGS: 00010206 [ 50.451584] RAX: 00007fed4c32b000 RBX: 0000000000800000 RCX: 00000000004464fa [ 50.458827] RDX: 0000000000801000 RSI: 0000000000801000 RDI: 0000000000000000 [ 50.466068] RBP: 00007ffff2f0f880 R08: ffffffffffffffff R09: 0000000000000000 [ 50.473311] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffff2f0f810 [ 50.480552] R13: 00007fed4cb2b700 R14: 0000000000000000 R15: 0000000000000000 [ 50.488400] Dumping ftrace buffer: [ 50.491967] (ftrace buffer empty) [ 50.495649] Kernel Offset: disabled [ 50.499253] Rebooting in 86400 seconds..