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-6,10.128.15.219' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 56.761107] kasan: CONFIG_KASAN_INLINE enabled [ 56.761828] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 56.762948] general protection fault: 0000 [#1] SMP KASAN [ 56.763683] Dumping ftrace buffer: [ 56.764156] (ftrace buffer empty) [ 56.764661] Modules linked in: [ 56.765130] CPU: 0 PID: 2996 Comm: syzkaller703395 Not tainted 4.14.0-rc5-next-20171018+ #36 [ 56.766247] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.767486] task: ffff8801d1e901c0 task.stack: ffff8801c07a0000 [ 56.768305] RIP: 0010:hrtimer_active+0x211/0x410 [ 56.768958] RSP: 0018:ffff8801c07a73f0 EFLAGS: 00010246 [ 56.769665] RAX: 0000000000000000 RBX: 1ffff100380f4eab RCX: ffffffff815ef89f [ 56.770616] RDX: 0000000000000000 RSI: ffffffff85b376a0 RDI: ffff8801d1d18a20 [ 56.771567] RBP: ffff8801c07a7530 R08: ffffffff83f9e367 R09: 0000000000000004 [ 56.772516] R10: ffff8801c07a7898 R11: 0000000000000000 R12: 0000000000000000 [ 56.773485] R13: 0000000000000000 R14: ffffed00380f4e89 R15: dffffc0000000000 [ 56.774435] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 56.775509] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 56.776292] CR2: 0000000020511fd8 CR3: 0000000005a22000 CR4: 00000000001406f0 [ 56.777243] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 56.778209] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 56.779170] Call Trace: [ 56.779530] ? hrtimer_forward+0x2d0/0x2d0 [ 56.780112] ? __might_sleep+0x95/0x190 [ 56.780644] ? rtnl_lock+0x17/0x20 [ 56.781120] ? __mutex_lock+0x16f/0x19d0 [ 56.784481] ? rtnl_lock+0x17/0x20 [ 56.787988] ? fsnotify+0xb6f/0x1af0 [ 56.791668] ? rtnl_lock+0x17/0x20 [ 56.795176] hrtimer_try_to_cancel+0x91/0x5c0 [ 56.799638] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 56.804540] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 56.810392] ? __free_insn_slot+0x5c0/0x5c0 [ 56.814681] ? rcu_note_context_switch+0x710/0x710 [ 56.819575] ? __lock_is_held+0xb6/0x140 [ 56.823605] hrtimer_cancel+0x22/0x40 [ 56.827370] napi_disable+0x87/0xa0 [ 56.830963] __tun_detach+0xe26/0x1570 [ 56.834815] ? __kernel_text_address+0xd/0x40 [ 56.839274] ? unwind_get_return_address+0x61/0xa0 [ 56.844171] ? tun_attach+0x1080/0x1080 [ 56.848109] ? check_noncircular+0x20/0x20 [ 56.852311] ? locks_remove_file+0x3fa/0x5a0 [ 56.856683] ? fcntl_setlk+0x10c0/0x10c0 [ 56.860708] ? free_fs_struct+0x4f/0x60 [ 56.864649] ? __fsnotify_parent+0xb4/0x3a0 [ 56.868936] ? fsnotify+0x1af0/0x1af0 [ 56.872704] ? rcu_note_context_switch+0x710/0x710 [ 56.877597] ? __tun_detach+0x1570/0x1570 [ 56.881708] ? __tun_detach+0x1570/0x1570 [ 56.885822] tun_chr_close+0x44/0x60 [ 56.889504] __fput+0x327/0x7e0 [ 56.892750] ? fput+0x140/0x140 [ 56.895999] ? _raw_spin_unlock_irq+0x27/0x70 [ 56.900466] ____fput+0x15/0x20 [ 56.903708] task_work_run+0x199/0x270 [ 56.907561] ? task_work_cancel+0x210/0x210 [ 56.911846] ? _raw_spin_unlock+0x22/0x30 [ 56.915958] ? switch_task_namespaces+0x87/0xc0 [ 56.920595] do_exit+0x9b5/0x1ad0 [ 56.924020] ? mm_update_next_owner+0x930/0x930 [ 56.928652] ? rtnl_unlock+0xe/0x10 [ 56.932243] ? __tun_chr_ioctl+0x27a/0x3e50 [ 56.936527] ? unwind_get_return_address+0x14/0xa0 [ 56.941423] ? tun_chr_read_iter+0x1e0/0x1e0 [ 56.945799] ? putname+0xee/0x130 [ 56.949218] ? save_stack+0xa3/0xd0 [ 56.952806] ? save_stack+0x43/0xd0 [ 56.956395] ? kasan_slab_free+0x71/0xc0 [ 56.960417] ? kmem_cache_free+0x77/0x280 [ 56.964526] ? putname+0xee/0x130 [ 56.967941] ? do_sys_open+0x31b/0x6d0 [ 56.971794] ? __lock_is_held+0xb6/0x140 [ 56.975827] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 56.981679] ? tun_chr_compat_ioctl+0x30/0x30 [ 56.986138] ? tun_chr_ioctl+0x2a/0x40 [ 56.989989] ? tun_chr_ioctl+0x2a/0x40 [ 56.993844] ? do_vfs_ioctl+0x486/0x1520 [ 56.997868] ? _cond_resched+0x14/0x30 [ 57.001723] ? ioctl_preallocate+0x2b0/0x2b0 [ 57.006100] ? selinux_capable+0x40/0x40 [ 57.010126] ? putname+0xf3/0x130 [ 57.013546] do_group_exit+0x149/0x400 [ 57.017398] ? SyS_exit+0x30/0x30 [ 57.020815] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 57.025795] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 57.030515] SyS_exit_group+0x1d/0x20 [ 57.034281] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 57.039003] RIP: 0033:0x442aa8 [ 57.042156] RSP: 002b:00007ffdf7aba078 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 57.049828] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442aa8 [ 57.057064] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 57.064299] RBP: 0000000000000082 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 57.071534] R10: 0000000000000000 R11: 0000000000000246 R12: 74656e2f7665642f [ 57.078769] R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000 [ 57.086013] 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 [ 57.105253] RIP: hrtimer_active+0x211/0x410 RSP: ffff8801c07a73f0 [ 57.111493] ---[ end trace bd3abd85a1b0d51a ]--- [ 57.116230] Kernel panic - not syncing: Fatal exception [ 57.121586] Dumping ftrace buffer: [ 57.125092] (ftrace buffer empty) [ 57.128766] Kernel Offset: disabled [ 57.132355] Rebooting in 86400 seconds..