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-9,10.128.0.15' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.528724] kasan: CONFIG_KASAN_INLINE enabled [ 31.533381] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.540861] general protection fault: 0000 [#1] SMP KASAN [ 31.546364] Dumping ftrace buffer: [ 31.549867] (ftrace buffer empty) [ 31.553540] Modules linked in: [ 31.556698] CPU: 1 PID: 2984 Comm: syzkaller088979 Not tainted 4.14.0-rc2-next-20170929+ #32 [ 31.565234] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.574551] task: ffff8801ce5fa180 task.stack: ffff8801ce568000 [ 31.580580] RIP: 0010:hrtimer_active+0x211/0x410 [ 31.585296] RSP: 0018:ffff8801ce56f3f0 EFLAGS: 00010246 [ 31.590622] RAX: 0000000000000000 RBX: 1ffff10039cadeab RCX: 1ffff10039cadee4 [ 31.597858] RDX: 0000000000000000 RSI: ffffffff85b3c500 RDI: ffff8801cddb4a20 [ 31.605093] RBP: ffff8801ce56f530 R08: ffffffff83ef0847 R09: ffff8801ce56ee00 [ 31.612329] R10: ffff8801ce56f898 R11: 1ffff10039cbf6c3 R12: 0000000000000000 [ 31.619577] R13: 0000000000000000 R14: ffffed0039cade89 R15: dffffc0000000000 [ 31.626823] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.635022] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.640872] CR2: 00007f00e9342000 CR3: 00000001ce05c000 CR4: 00000000001406e0 [ 31.648110] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.655348] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.662582] Call Trace: [ 31.665145] ? hrtimer_forward+0x2d0/0x2d0 [ 31.669346] ? __might_sleep+0x95/0x190 [ 31.673285] ? rtnl_lock+0x17/0x20 [ 31.676789] ? __mutex_lock+0x16f/0x19d0 [ 31.680813] ? rtnl_lock+0x17/0x20 [ 31.684321] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 31.689477] ? fsnotify+0xb6f/0x1af0 [ 31.693156] ? rtnl_lock+0x17/0x20 [ 31.696664] ? tun_get_drvinfo+0x2b0/0x2b0 [ 31.700862] hrtimer_try_to_cancel+0x91/0x5c0 [ 31.705322] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 31.710215] ? tun_get_drvinfo+0x2b0/0x2b0 [ 31.714416] ? trace_event_raw_event_sched_switch+0x770/0x770 [ 31.720264] ? rcu_note_context_switch+0x710/0x710 [ 31.725157] ? __lock_is_held+0xbc/0x140 [ 31.729183] ? tun_get_drvinfo+0x2b0/0x2b0 [ 31.733379] hrtimer_cancel+0x22/0x40 [ 31.737147] napi_disable+0x87/0xa0 [ 31.740738] __tun_detach+0xe26/0x1570 [ 31.744593] ? fasync_remove_entry+0x38/0x230 [ 31.749052] ? check_noncircular+0x20/0x20 [ 31.753257] ? tun_attach+0x1070/0x1070 [ 31.757197] ? do_raw_spin_trylock+0x190/0x190 [ 31.761750] ? fcntl_setlk+0x10d0/0x10d0 [ 31.765777] ? _raw_spin_unlock+0x22/0x30 [ 31.769891] ? fasync_remove_entry+0x1be/0x230 [ 31.774438] ? __tun_detach+0x1570/0x1570 [ 31.778547] ? tun_get_drvinfo+0x2b0/0x2b0 [ 31.782747] ? __tun_detach+0x1570/0x1570 [ 31.786858] ? tun_get_drvinfo+0x2b0/0x2b0 [ 31.791058] tun_chr_close+0x44/0x60 [ 31.794738] __fput+0x333/0x7f0 [ 31.797985] ? fput+0x140/0x140 [ 31.801231] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.805693] ____fput+0x15/0x20 [ 31.808936] task_work_run+0x199/0x270 [ 31.812788] ? task_work_cancel+0x210/0x210 [ 31.817074] ? _raw_spin_unlock+0x22/0x30 [ 31.821184] ? switch_task_namespaces+0x87/0xc0 [ 31.825821] do_exit+0x9c8/0x1b00 [ 31.829241] ? mm_update_next_owner+0x930/0x930 [ 31.833877] ? __sched_text_start+0x8/0x8 [ 31.837991] ? tun_chr_read_iter+0x1e0/0x1e0 [ 31.842364] ? putname+0xee/0x130 [ 31.845780] ? save_stack+0xa3/0xd0 [ 31.849373] ? save_stack_trace+0x16/0x20 [ 31.853483] ? save_stack+0x43/0xd0 [ 31.857075] ? kmem_cache_free+0x77/0x280 [ 31.861183] ? putname+0xee/0x130 [ 31.864603] ? __lock_is_held+0xbc/0x140 [ 31.868631] ? schedule+0xf5/0x430 [ 31.872134] ? __schedule+0x2070/0x2070 [ 31.876076] ? trace_event_raw_event_sched_switch+0x770/0x770 [ 31.881927] ? tun_chr_compat_ioctl+0x30/0x30 [ 31.886385] ? tun_chr_ioctl+0x2a/0x40 [ 31.890239] ? exit_to_usermode_loop+0x8c/0x310 [ 31.894873] ? trace_hardirqs_off+0xd/0x10 [ 31.899071] ? exit_to_usermode_loop+0x198/0x310 [ 31.903789] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 31.909292] ? selinux_capable+0x40/0x40 [ 31.913322] do_group_exit+0x149/0x400 [ 31.917170] ? prepare_exit_to_usermode+0x2d0/0x2d0 [ 31.922148] ? SyS_exit+0x30/0x30 [ 31.925565] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.930543] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.935265] SyS_exit_group+0x1d/0x20 [ 31.939030] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 31.943751] RIP: 0033:0x442aa8 [ 31.946906] RSP: 002b:00007fff49d90b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.954576] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442aa8 [ 31.961808] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.969042] RBP: 0000000000000086 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.976274] R10: 0000000000000000 R11: 0000000000000246 R12: 74656e2f7665642f [ 31.983508] R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000 [ 31.990749] 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 [ 32.009815] RIP: hrtimer_active+0x211/0x410 RSP: ffff8801ce56f3f0 [ 32.016196] ---[ end trace 3f5a153184151e5a ]--- [ 32.021042] Kernel panic - not syncing: Fatal exception [ 32.026432] Dumping ftrace buffer: [ 32.029938] (ftrace buffer empty) [ 32.033614] Kernel Offset: disabled [ 32.037209] Rebooting in 86400 seconds..