[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[ 9.381648] rsyslogd (2864) used greatest stack depth: 15056 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-mmots-kasan-gce-9,10.128.15.198' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.089232] kasan: CONFIG_KASAN_INLINE enabled [ 26.090138] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.091317] general protection fault: 0000 [#1] SMP KASAN [ 26.092070] Dumping ftrace buffer: [ 26.092585] (ftrace buffer empty) [ 26.093167] Modules linked in: [ 26.093607] CPU: 0 PID: 2987 Comm: syzkaller761622 Not tainted 4.14.0-rc5-mm1+ #18 [ 26.094626] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.095922] task: ffff8801d1c96740 task.stack: ffff8801d1d38000 [ 26.096747] RIP: 0010:hrtimer_active+0x211/0x410 [ 26.097394] RSP: 0018:ffff8801d1d3f3f0 EFLAGS: 00010246 [ 26.098102] RAX: 0000000000000000 RBX: 1ffff1003a3a7eab RCX: ffffffff815ef93f [ 26.099131] RDX: 0000000000000000 RSI: ffffffff85b376e0 RDI: ffff8801d49e72e0 [ 26.100123] RBP: ffff8801d1d3f530 R08: ffffffff83f9e367 R09: 0000000000000004 [ 26.101132] R10: ffff8801d1d3f898 R11: 0000000000000000 R12: 0000000000000000 [ 26.102126] R13: 0000000000000000 R14: ffffed003a3a7e89 R15: dffffc0000000000 [ 26.103185] FS: 00000000020c0880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.104304] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.105078] CR2: 00007f3aed9e3518 CR3: 00000001cee83000 CR4: 00000000001406f0 [ 26.106033] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.106983] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.107936] Call Trace: [ 26.108297] ? hrtimer_forward+0x2d0/0x2d0 [ 26.108922] ? __might_sleep+0x95/0x190 [ 26.110302] ? rtnl_lock+0x17/0x20 [ 26.113822] ? __mutex_lock+0x16f/0x19d0 [ 26.117847] ? rtnl_lock+0x17/0x20 [ 26.121355] ? fsnotify+0xb6f/0x1af0 [ 26.125036] ? rtnl_lock+0x17/0x20 [ 26.128633] hrtimer_try_to_cancel+0x91/0x5c0 [ 26.133111] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 26.138011] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 26.143860] ? __free_insn_slot+0x5c0/0x5c0 [ 26.148148] ? rcu_note_context_switch+0x710/0x710 [ 26.153044] ? __lock_is_held+0xb6/0x140 [ 26.157074] hrtimer_cancel+0x22/0x40 [ 26.160840] napi_disable+0x87/0xa0 [ 26.164433] __tun_detach+0xe26/0x1570 [ 26.168284] ? __kernel_text_address+0xd/0x40 [ 26.172743] ? unwind_get_return_address+0x61/0xa0 [ 26.177637] ? tun_attach+0x1080/0x1080 [ 26.181576] ? check_noncircular+0x20/0x20 [ 26.185776] ? locks_remove_file+0x3fa/0x5a0 [ 26.190148] ? fcntl_setlk+0x10c0/0x10c0 [ 26.194174] ? free_fs_struct+0x4f/0x60 [ 26.198116] ? __fsnotify_parent+0xb4/0x3a0 [ 26.202404] ? fsnotify+0x1af0/0x1af0 [ 26.206169] ? rcu_note_context_switch+0x710/0x710 [ 26.211065] ? __tun_detach+0x1570/0x1570 [ 26.215178] ? __tun_detach+0x1570/0x1570 [ 26.219292] tun_chr_close+0x44/0x60 [ 26.222972] __fput+0x327/0x7e0 [ 26.226234] ? fput+0x140/0x140 [ 26.229479] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.233942] ____fput+0x15/0x20 [ 26.237188] task_work_run+0x199/0x270 [ 26.241043] ? task_work_cancel+0x210/0x210 [ 26.245328] ? _raw_spin_unlock+0x22/0x30 [ 26.249440] ? switch_task_namespaces+0x87/0xc0 [ 26.254077] do_exit+0x9b5/0x1ad0 [ 26.257509] ? mm_update_next_owner+0x930/0x930 [ 26.262141] ? rtnl_unlock+0xe/0x10 [ 26.265732] ? __tun_chr_ioctl+0x27a/0x3e50 [ 26.270015] ? unwind_get_return_address+0x14/0xa0 [ 26.274912] ? tun_chr_read_iter+0x1e0/0x1e0 [ 26.279286] ? putname+0xee/0x130 [ 26.282706] ? save_stack+0xa3/0xd0 [ 26.286299] ? save_stack+0x43/0xd0 [ 26.289888] ? kasan_slab_free+0x71/0xc0 [ 26.293912] ? kmem_cache_free+0x77/0x280 [ 26.298026] ? putname+0xee/0x130 [ 26.301441] ? do_sys_open+0x31b/0x6d0 [ 26.305302] ? __lock_is_held+0xb6/0x140 [ 26.309423] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 26.315277] ? tun_chr_compat_ioctl+0x30/0x30 [ 26.319736] ? tun_chr_ioctl+0x2a/0x40 [ 26.323587] ? tun_chr_ioctl+0x2a/0x40 [ 26.327438] ? do_vfs_ioctl+0x486/0x1520 [ 26.331467] ? _cond_resched+0x14/0x30 [ 26.335322] ? ioctl_preallocate+0x2b0/0x2b0 [ 26.339696] ? selinux_capable+0x40/0x40 [ 26.343722] ? putname+0xf3/0x130 [ 26.347144] do_group_exit+0x149/0x400 [ 26.350995] ? SyS_exit+0x30/0x30 [ 26.354414] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.359395] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.364123] SyS_exit_group+0x1d/0x20 [ 26.367890] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 26.372608] RIP: 0033:0x442aa8 [ 26.375770] RSP: 002b:00007fffeb2529c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 26.383443] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442aa8 [ 26.390680] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 26.397929] RBP: 0000000000000082 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 26.405164] R10: 0000000000000000 R11: 0000000000000246 R12: 74656e2f7665642f [ 26.412398] R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000 [ 26.419641] 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 [ 26.438708] RIP: hrtimer_active+0x211/0x410 RSP: ffff8801d1d3f3f0 [ 26.445049] ---[ end trace f9c7f66be8deaae6 ]--- [ 26.453763] Kernel panic - not syncing: Fatal exception [ 26.459124] Dumping ftrace buffer: [ 26.462631] (ftrace buffer empty) [ 26.466308] Kernel Offset: disabled [ 26.469903] Rebooting in 86400 seconds..