[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[ 9.375877] rsyslogd (2863) used greatest stack depth: 14512 bytes left [?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-7,10.128.0.2' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 25.957387] kasan: CONFIG_KASAN_INLINE enabled [ 25.958336] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.959491] general protection fault: 0000 [#1] SMP KASAN [ 25.960229] Dumping ftrace buffer: [ 25.960713] (ftrace buffer empty) [ 25.961229] Modules linked in: [ 25.961667] CPU: 0 PID: 2987 Comm: syzkaller012381 Not tainted 4.14.0-rc5-next-20171018+ #36 [ 25.962798] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.964019] task: ffff8801d1e12100 task.stack: ffff8801d1ea0000 [ 25.964829] RIP: 0010:hrtimer_active+0x211/0x410 [ 25.965462] RSP: 0018:ffff8801d1ea73f0 EFLAGS: 00010246 [ 25.966200] RAX: 0000000000000000 RBX: 1ffff1003a3d4eab RCX: ffffffff815ef89f [ 25.967200] RDX: 0000000000000000 RSI: ffffffff85b376a0 RDI: ffff8801d1cfd920 [ 25.968176] RBP: ffff8801d1ea7530 R08: ffffffff83f9e367 R09: 0000000000000004 [ 25.969147] R10: ffff8801d1ea7898 R11: 0000000000000000 R12: 0000000000000000 [ 25.970186] R13: 0000000000000000 R14: ffffed003a3d4e89 R15: dffffc0000000000 [ 25.971144] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 25.972266] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.973064] CR2: 0000000020511fd8 CR3: 0000000005a22000 CR4: 00000000001406f0 [ 25.974099] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.975078] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.976059] Call Trace: [ 25.976422] ? hrtimer_forward+0x2d0/0x2d0 [ 25.976991] ? __might_sleep+0x95/0x190 [ 25.977528] ? rtnl_lock+0x17/0x20 [ 25.978010] ? __mutex_lock+0x16f/0x19d0 [ 25.982038] ? rtnl_lock+0x17/0x20 [ 25.985550] ? fsnotify+0xb6f/0x1af0 [ 25.989236] ? rtnl_lock+0x17/0x20 [ 25.992750] hrtimer_try_to_cancel+0x91/0x5c0 [ 25.997215] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 26.002120] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 26.007973] ? __free_insn_slot+0x5c0/0x5c0 [ 26.012271] ? rcu_note_context_switch+0x710/0x710 [ 26.017178] ? __lock_is_held+0xb6/0x140 [ 26.021208] hrtimer_cancel+0x22/0x40 [ 26.024976] napi_disable+0x87/0xa0 [ 26.028573] __tun_detach+0xe26/0x1570 [ 26.032438] ? __kernel_text_address+0xd/0x40 [ 26.036902] ? unwind_get_return_address+0x61/0xa0 [ 26.041798] ? tun_attach+0x1080/0x1080 [ 26.045739] ? check_noncircular+0x20/0x20 [ 26.049941] ? locks_remove_file+0x3fa/0x5a0 [ 26.054313] ? fcntl_setlk+0x10c0/0x10c0 [ 26.058340] ? free_fs_struct+0x4f/0x60 [ 26.062283] ? __fsnotify_parent+0xb4/0x3a0 [ 26.066572] ? fsnotify+0x1af0/0x1af0 [ 26.070341] ? rcu_note_context_switch+0x710/0x710 [ 26.075237] ? __tun_detach+0x1570/0x1570 [ 26.079351] ? __tun_detach+0x1570/0x1570 [ 26.083466] tun_chr_close+0x44/0x60 [ 26.087154] __fput+0x327/0x7e0 [ 26.090404] ? fput+0x140/0x140 [ 26.093653] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.098117] ____fput+0x15/0x20 [ 26.101364] task_work_run+0x199/0x270 [ 26.105219] ? task_work_cancel+0x210/0x210 [ 26.109507] ? _raw_spin_unlock+0x22/0x30 [ 26.113620] ? switch_task_namespaces+0x87/0xc0 [ 26.118257] do_exit+0x9b5/0x1ad0 [ 26.121680] ? mm_update_next_owner+0x930/0x930 [ 26.126316] ? rtnl_unlock+0xe/0x10 [ 26.129910] ? __tun_chr_ioctl+0x27a/0x3e50 [ 26.134195] ? unwind_get_return_address+0x14/0xa0 [ 26.139097] ? tun_chr_read_iter+0x1e0/0x1e0 [ 26.143483] ? putname+0xee/0x130 [ 26.146902] ? save_stack+0xa3/0xd0 [ 26.150494] ? save_stack+0x43/0xd0 [ 26.154087] ? kasan_slab_free+0x71/0xc0 [ 26.158111] ? kmem_cache_free+0x77/0x280 [ 26.162227] ? putname+0xee/0x130 [ 26.165645] ? do_sys_open+0x31b/0x6d0 [ 26.169505] ? __lock_is_held+0xb6/0x140 [ 26.173540] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 26.179394] ? tun_chr_compat_ioctl+0x30/0x30 [ 26.183855] ? tun_chr_ioctl+0x2a/0x40 [ 26.187707] ? tun_chr_ioctl+0x2a/0x40 [ 26.191559] ? do_vfs_ioctl+0x486/0x1520 [ 26.195586] ? _cond_resched+0x14/0x30 [ 26.199439] ? ioctl_preallocate+0x2b0/0x2b0 [ 26.203817] ? selinux_capable+0x40/0x40 [ 26.207843] ? putname+0xf3/0x130 [ 26.211265] do_group_exit+0x149/0x400 [ 26.215120] ? SyS_exit+0x30/0x30 [ 26.218538] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.223521] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.228250] SyS_exit_group+0x1d/0x20 [ 26.232019] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 26.236741] RIP: 0033:0x442aa8 [ 26.239899] RSP: 002b:00007ffcd5083498 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 26.247589] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442aa8 [ 26.254837] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 26.262076] RBP: 0000000000000082 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 26.269313] R10: 0000000000000000 R11: 0000000000000246 R12: 74656e2f7665642f [ 26.276556] R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000 [ 26.283800] Code: c6 00 00 48 8b 85 d8 fe ff ff 48 c1 e8 03 42 80 3c 38 00 0f 85 f2 01 00 00 48 8b 85 e8 fe ff ff 4c 8b 60 30 4c 89 e0 48 c1 e8 03 <42> 80 3c 38 00 0f 85 c8 01 00 00 48 8b 85 f0 fe ff ff 49 8b 1c [ 26.302872] RIP: hrtimer_active+0x211/0x410 RSP: ffff8801d1ea73f0 [ 26.309158] ---[ end trace 0cc28ab8e63790f3 ]--- [ 26.313908] Kernel panic - not syncing: Fatal exception [ 26.319596] Dumping ftrace buffer: [ 26.323108] (ftrace buffer empty) [ 26.326788] Kernel Offset: disabled [ 26.330380] Rebooting in 86400 seconds..