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-mmots-kasan-gce-3,10.128.15.220' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.169410] kasan: CONFIG_KASAN_INLINE enabled [ 42.174106] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.181634] general protection fault: 0000 [#1] SMP KASAN [ 42.187141] Dumping ftrace buffer: [ 42.190649] (ftrace buffer empty) [ 42.194327] Modules linked in: [ 42.197489] CPU: 0 PID: 2983 Comm: syzkaller137087 Not tainted 4.14.0-rc3-mm1+ #14 [ 42.205162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.214487] task: ffff8801ce088380 task.stack: ffff8801cd428000 [ 42.220522] RIP: 0010:hrtimer_active+0x211/0x410 [ 42.225242] RSP: 0018:ffff8801cd42f3f0 EFLAGS: 00010246 [ 42.230573] RAX: 0000000000000000 RBX: 1ffff10039a85eab RCX: 1ffff10039a85ee4 [ 42.237812] RDX: ffff8801ce088380 RSI: ffffffff85b3c100 RDI: ffff8801cdfd69e0 [ 42.245050] RBP: ffff8801cd42f530 R08: ffffffff83ef2847 R09: ffff8801cd42ee00 [ 42.252289] R10: ffff8801cd42f898 R11: 1ffff10039c11303 R12: 0000000000000000 [ 42.259532] R13: 0000000000000000 R14: ffffed0039a85e89 R15: dffffc0000000000 [ 42.266774] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 42.274983] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.280833] CR2: 0000000020511fd8 CR3: 00000001cefa3000 CR4: 00000000001406f0 [ 42.288073] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.295315] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.302558] Call Trace: [ 42.305129] ? hrtimer_forward+0x2d0/0x2d0 [ 42.309334] ? __might_sleep+0x95/0x190 [ 42.314098] ? rtnl_lock+0x17/0x20 [ 42.317608] ? __mutex_lock+0x16f/0x19d0 [ 42.321635] ? rtnl_lock+0x17/0x20 [ 42.325144] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 42.330310] ? fsnotify+0xb6f/0x1af0 [ 42.333993] ? rtnl_lock+0x17/0x20 [ 42.337510] ? tun_get_drvinfo+0x2b0/0x2b0 [ 42.341719] hrtimer_try_to_cancel+0x91/0x5c0 [ 42.346184] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 42.351079] ? tun_get_drvinfo+0x2b0/0x2b0 [ 42.355290] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 42.361154] ? rcu_note_context_switch+0x710/0x710 [ 42.366138] ? __lock_is_held+0xbc/0x140 [ 42.370166] ? tun_get_drvinfo+0x2b0/0x2b0 [ 42.374364] hrtimer_cancel+0x22/0x40 [ 42.378133] napi_disable+0x87/0xa0 [ 42.381726] __tun_detach+0xe26/0x1570 [ 42.385582] ? fasync_remove_entry+0x38/0x230 [ 42.390043] ? check_noncircular+0x20/0x20 [ 42.394244] ? tun_attach+0x1070/0x1070 [ 42.398183] ? do_raw_spin_trylock+0x190/0x190 [ 42.402736] ? fcntl_setlk+0x10d0/0x10d0 [ 42.406768] ? _raw_spin_unlock+0x22/0x30 [ 42.410882] ? fasync_remove_entry+0x1be/0x230 [ 42.415435] ? __tun_detach+0x1570/0x1570 [ 42.419552] ? tun_get_drvinfo+0x2b0/0x2b0 [ 42.423754] ? __tun_detach+0x1570/0x1570 [ 42.427867] ? tun_get_drvinfo+0x2b0/0x2b0 [ 42.432067] tun_chr_close+0x44/0x60 [ 42.435748] __fput+0x333/0x7f0 [ 42.438996] ? fput+0x140/0x140 [ 42.442242] ? _raw_spin_unlock_irq+0x27/0x70 [ 42.446710] ____fput+0x15/0x20 [ 42.449958] task_work_run+0x199/0x270 [ 42.453815] ? task_work_cancel+0x210/0x210 [ 42.458103] ? _raw_spin_unlock+0x22/0x30 [ 42.462218] ? switch_task_namespaces+0x87/0xc0 [ 42.466854] do_exit+0x9c8/0x1b00 [ 42.470280] ? mm_update_next_owner+0x930/0x930 [ 42.474919] ? rtnl_unlock+0xe/0x10 [ 42.478514] ? __tun_chr_ioctl+0x27a/0x3e40 [ 42.482803] ? unwind_get_return_address+0x34/0xa0 [ 42.487713] ? tun_chr_read_iter+0x1e0/0x1e0 [ 42.492089] ? putname+0xee/0x130 [ 42.495509] ? save_stack+0xa3/0xd0 [ 42.499107] ? save_stack_trace+0x16/0x20 [ 42.503219] ? save_stack+0x43/0xd0 [ 42.506810] ? kasan_slab_free+0x71/0xc0 [ 42.510835] ? kmem_cache_free+0x77/0x280 [ 42.514948] ? putname+0xee/0x130 [ 42.518373] ? __lock_is_held+0xbc/0x140 [ 42.522410] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 42.528273] ? tun_chr_compat_ioctl+0x30/0x30 [ 42.533168] ? tun_chr_ioctl+0x2a/0x40 [ 42.537019] ? tun_chr_ioctl+0x2a/0x40 [ 42.540873] ? do_vfs_ioctl+0x492/0x1530 [ 42.544900] ? _cond_resched+0x14/0x30 [ 42.548756] ? ioctl_preallocate+0x2b0/0x2b0 [ 42.553134] ? selinux_capable+0x40/0x40 [ 42.557161] ? putname+0xf3/0x130 [ 42.560586] do_group_exit+0x149/0x400 [ 42.564440] ? SyS_exit+0x30/0x30 [ 42.567866] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 42.572851] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 42.577574] SyS_exit_group+0x1d/0x20 [ 42.581342] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 42.586065] RIP: 0033:0x442aa8 [ 42.589220] RSP: 002b:00007ffedd19e408 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 42.596894] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442aa8 [ 42.604130] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 42.611368] RBP: 0000000000000086 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 42.618609] R10: 000000000000ffff R11: 0000000000000246 R12: 74656e2f7665642f [ 42.625845] R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000 [ 42.633094] 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 [ 42.652177] RIP: hrtimer_active+0x211/0x410 RSP: ffff8801cd42f3f0 [ 42.658428] ---[ end trace 99f7e3be0c5fa189 ]--- [ 42.663167] Kernel panic - not syncing: Fatal exception [ 42.668535] Dumping ftrace buffer: [ 42.672047] (ftrace buffer empty) [ 42.675731] Kernel Offset: disabled [ 42.679326] Rebooting in 86400 seconds..