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-2,10.128.15.218' (ECDSA) to the list of known hosts. 2017/09/27 07:30:35 parsed 1 programs 2017/09/27 07:30:35 executed programs: 0 syzkaller login: [ 34.826088] ------------[ cut here ]------------ [ 34.831033] WARNING: CPU: 1 PID: 3143 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 34.839618] Kernel panic - not syncing: panic_on_warn set ... [ 34.839618] [ 34.846957] CPU: 1 PID: 3143 Comm: syz-executor2 Not tainted 4.14.0-rc2-next-20170927+ #30 [ 34.855332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.864661] Call Trace: [ 34.867216] [ 34.869346] dump_stack+0x194/0x257 [ 34.872950] ? arch_local_irq_restore+0x53/0x53 [ 34.877608] panic+0x1e4/0x417 [ 34.880776] ? __warn+0x1d9/0x1d9 [ 34.884203] ? show_regs_print_info+0x65/0x65 [ 34.888690] ? free_kthread_struct+0xa2/0xe0 [ 34.893070] __warn+0x1c4/0x1d9 [ 34.896321] ? free_kthread_struct+0xa2/0xe0 [ 34.900706] report_bug+0x211/0x2d0 [ 34.904314] fixup_bug+0x40/0x90 [ 34.907654] do_trap+0x260/0x390 [ 34.911003] do_error_trap+0x120/0x390 [ 34.914868] ? do_trap+0x390/0x390 [ 34.918381] ? find_held_lock+0x39/0x1d0 [ 34.922416] ? free_kthread_struct+0xa2/0xe0 [ 34.926816] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.931651] do_invalid_op+0x1b/0x20 [ 34.935339] invalid_op+0x18/0x20 [ 34.938768] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 34.943757] RSP: 0000:ffff8801db307710 EFLAGS: 00010206 [ 34.949096] RAX: ffff8801caab0440 RBX: ffff8801ca9ab340 RCX: 1ffff1003b660ed6 [ 34.956515] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801ca9ab4c8 [ 34.963760] RBP: ffff8801db307718 R08: 0000000000000000 R09: 1ffff1003b660ec9 [ 34.971004] R10: ffff8801caab0440 R11: 0000000000000004 R12: 1ffff1003b660ee5 [ 34.978251] R13: 1ffff1003b660ee9 R14: 0000000000000000 R15: ffff8801db307788 [ 34.985519] free_task+0x134/0x1a0 [ 34.989033] ? arch_release_task_struct+0x10/0x10 [ 34.993856] ? atomic_notifier_call_chain+0xb9/0x140 [ 34.998959] __put_task_struct+0x240/0x5b0 [ 35.003171] ? free_task+0x1a0/0x1a0 [ 35.006863] ? __lock_is_held+0xbc/0x140 [ 35.010912] delayed_put_task_struct+0xca/0x3d0 [ 35.015556] ? child_wait_callback+0x210/0x210 [ 35.020114] ? put_pid+0x184/0x1f0 [ 35.023631] ? task_active_pid_ns+0xd0/0xd0 [ 35.027935] ? rcu_process_callbacks+0x115c/0x17d0 [ 35.032837] ? put_pid+0x1f0/0x1f0 [ 35.036349] ? child_wait_callback+0x210/0x210 [ 35.040907] rcu_process_callbacks+0xd74/0x17d0 [ 35.045563] ? note_gp_changes+0x650/0x650 [ 35.049767] ? print_usage_bug+0x480/0x480 [ 35.053978] ? timerqueue_add+0x1e9/0x280 [ 35.058102] ? find_held_lock+0x39/0x1d0 [ 35.062145] ? check_noncircular+0x20/0x20 [ 35.066350] ? lock_downgrade+0x990/0x990 [ 35.070478] ? lock_acquire+0x1d5/0x580 [ 35.074426] ? clockevents_program_event+0x163/0x2e0 [ 35.079514] ? __lock_is_held+0xbc/0x140 [ 35.083570] __do_softirq+0x29d/0xbb2 [ 35.087353] ? __irqentry_text_end+0x4/0x4 [ 35.091560] ? do_raw_spin_trylock+0x190/0x190 [ 35.096117] ? do_timer+0x50/0x50 [ 35.099542] ? tick_nohz_handler+0x130/0x130 [ 35.103927] ? native_apic_msr_write+0x5c/0x80 [ 35.108484] ? lapic_next_event+0x54/0x80 [ 35.112607] ? clockevents_program_event+0x108/0x2e0 [ 35.117689] ? tick_program_event+0x7f/0xd0 [ 35.121993] ? __lock_is_held+0xbc/0x140 [ 35.126040] irq_exit+0x1d3/0x210 [ 35.129470] smp_apic_timer_interrupt+0x16b/0x700 [ 35.134285] ? smp_reschedule_interrupt+0xe6/0x670 [ 35.139191] ? smp_call_function_single_interrupt+0x640/0x640 [ 35.145050] ? _raw_spin_lock+0x32/0x40 [ 35.149007] ? handle_edge_irq+0x2b4/0x7c0 [ 35.153229] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.158051] apic_timer_interrupt+0x9d/0xb0 [ 35.162344] [ 35.164553] RIP: 0010:lock_is_held_type+0x18b/0x210 [ 35.169542] RSP: 0000:ffff8801caa27668 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11 [ 35.177227] RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 35.184469] RDX: 1ffffffff0b59705 RSI: ffffffff85b3c240 RDI: 0000000000000286 [ 35.191715] RBP: ffff8801caa27688 R08: ffff8801caa270e8 R09: ffff8801caa270e0 [ 35.198959] R10: ffff8801caa27058 R11: 1ffff1003955631b R12: ffff8801caab0440 [ 35.206201] R13: 0000000000000000 R14: 00000000000001dc R15: dffffc0000000000 [ 35.213472] ___might_sleep+0x35e/0x470 [ 35.217423] ? trace_event_raw_event_sched_switch+0x770/0x770 [ 35.223280] ? lock_release+0xd70/0xd70 [ 35.227229] ? trace_event_raw_event_sched_switch+0x770/0x770 [ 35.233096] ? rcu_note_context_switch+0x710/0x710 [ 35.238005] __might_sleep+0x95/0x190 [ 35.241786] block_page_mkwrite+0xe8/0x3a0 [ 35.245995] ? down_read+0x96/0x150 [ 35.249594] ? ext4_inode_attach_jinode.part.67+0x150/0x150 [ 35.255280] ? cont_write_begin+0x770/0x770 [ 35.259577] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 35.264307] ? __sb_start_write+0x203/0x290 [ 35.268606] ext4_page_mkwrite+0xd60/0x1240 [ 35.272908] ? ext4_change_inode_journal_flag+0x3c0/0x3c0 [ 35.278417] ? __down_interruptible+0x6b0/0x6b0 [ 35.283060] ? __pmd_alloc+0x146/0x4e0 [ 35.286921] ? __lock_is_held+0xbc/0x140 [ 35.290958] ? up_read+0x1a/0x40 [ 35.294302] do_page_mkwrite+0x141/0x490 [ 35.298339] ? print_bad_pte+0x8f0/0x8f0 [ 35.302377] ? lockdep_init_map+0x3d/0x70 [ 35.306502] ? _raw_spin_unlock+0x22/0x30 [ 35.310624] ? __pmd_alloc+0x3f0/0x4e0 [ 35.314492] __handle_mm_fault+0x1aab/0x39c0 [ 35.318880] ? __pmd_alloc+0x4e0/0x4e0 [ 35.322751] ? lock_downgrade+0x990/0x990 [ 35.326872] ? find_held_lock+0x39/0x1d0 [ 35.330918] ? __lock_is_held+0xbc/0x140 [ 35.334981] handle_mm_fault+0x334/0x8d0 [ 35.339013] ? down_read_trylock+0xdb/0x170 [ 35.343303] ? __do_page_fault+0x31e/0xd60 [ 35.347509] ? __handle_mm_fault+0x39c0/0x39c0 [ 35.352067] ? vmacache_find+0x5f/0x280 [ 35.356016] ? vmacache_update+0xfe/0x130 [ 35.360138] ? find_vma+0x30/0x150 [ 35.363653] __do_page_fault+0x5bd/0xd60 [ 35.367703] ? mm_fault_error+0x2c0/0x2c0 [ 35.371822] ? fput+0xd2/0x140 [ 35.374989] ? filp_close+0x1a1/0x240 [ 35.378763] ? file_path+0x30/0x30 [ 35.382279] do_page_fault+0xee/0x720 [ 35.386055] ? __do_page_fault+0xd60/0xd60 [ 35.390265] ? __close_fd+0x269/0x3d0 [ 35.394043] ? fd_install+0x60/0x60 [ 35.397647] ? lockdep_sys_exit+0x47/0xf0 [ 35.401768] ? retint_user+0x18/0x20 [ 35.405459] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.410282] page_fault+0x22/0x30 [ 35.413708] RIP: 0033:0x40125d [ 35.416879] RSP: 002b:00007ffc87ef2e80 EFLAGS: 00010287 [ 35.422221] RAX: 0000001ddcc20000 RBX: 00000000021f8914 RCX: 000000000040c3e0 [ 35.429462] RDX: 0000001ddbc20000 RSI: 0000000000000000 RDI: 0000000000000000 [ 35.436714] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000021f8940 [ 35.443967] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000c23 [ 35.451212] R13: 0000000000000007 R14: 00000000000087c5 R15: 0000000000000016 [ 35.458641] Dumping ftrace buffer: [ 35.462219] (ftrace buffer empty) [ 35.465917] Kernel Offset: disabled [ 35.469526] Rebooting in 86400 seconds..