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-8,10.128.0.41' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.548817] kasan: CONFIG_KASAN_INLINE enabled [ 33.549572] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 33.550664] general protection fault: 0000 [#1] SMP KASAN [ 33.551396] Dumping ftrace buffer: [ 33.551870] (ftrace buffer empty) [ 33.552369] Modules linked in: [ 33.552826] CPU: 1 PID: 2995 Comm: syzkaller758499 Not tainted 4.14.0-rc5-mm1+ #20 [ 33.553832] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.555096] task: ffff8801d1e70180 task.stack: ffff8801c05e0000 [ 33.555932] RIP: 0010:hrtimer_active+0x211/0x410 [ 33.556559] RSP: 0018:ffff8801c05e73f0 EFLAGS: 00010246 [ 33.557284] RAX: 0000000000000000 RBX: 1ffff100380bceab RCX: ffffffff815ef93f [ 33.558236] RDX: 0000000000000000 RSI: ffffffff85b377a0 RDI: ffff8801d1f38ea0 [ 33.559185] RBP: ffff8801c05e7530 R08: ffffffff83f9f367 R09: 0000000000000004 [ 33.560158] R10: ffff8801c05e7898 R11: 0000000000000000 R12: 0000000000000000 [ 33.561110] R13: 0000000000000000 R14: ffffed00380bce89 R15: dffffc0000000000 [ 33.562156] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.563310] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.564103] CR2: 0000000020511fd8 CR3: 0000000005a22000 CR4: 00000000001406e0 [ 33.565127] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.566105] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.567079] Call Trace: [ 33.567438] ? hrtimer_forward+0x2d0/0x2d0 [ 33.568005] ? __might_sleep+0x95/0x190 [ 33.568537] ? rtnl_lock+0x17/0x20 [ 33.569359] ? __mutex_lock+0x16f/0x19d0 [ 33.573385] ? rtnl_lock+0x17/0x20 [ 33.576900] ? fsnotify+0xb6f/0x1af0 [ 33.580580] ? rtnl_lock+0x17/0x20 [ 33.584091] hrtimer_try_to_cancel+0x91/0x5c0 [ 33.588554] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 33.593453] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 33.599302] ? __free_insn_slot+0x5c0/0x5c0 [ 33.603592] ? rcu_note_context_switch+0x710/0x710 [ 33.608488] ? __lock_is_held+0xb6/0x140 [ 33.612515] hrtimer_cancel+0x22/0x40 [ 33.616282] napi_disable+0x87/0xa0 [ 33.619875] __tun_detach+0xe26/0x1570 [ 33.623732] ? __kernel_text_address+0xd/0x40 [ 33.628192] ? unwind_get_return_address+0x61/0xa0 [ 33.633087] ? tun_attach+0x1080/0x1080 [ 33.637025] ? check_noncircular+0x20/0x20 [ 33.641226] ? locks_remove_file+0x3fa/0x5a0 [ 33.645597] ? fcntl_setlk+0x10c0/0x10c0 [ 33.649624] ? free_fs_struct+0x4f/0x60 [ 33.653563] ? __fsnotify_parent+0xb4/0x3a0 [ 33.657856] ? fsnotify+0x1af0/0x1af0 [ 33.661620] ? rcu_note_context_switch+0x710/0x710 [ 33.666513] ? __tun_detach+0x1570/0x1570 [ 33.670624] ? __tun_detach+0x1570/0x1570 [ 33.674735] tun_chr_close+0x44/0x60 [ 33.678412] __fput+0x327/0x7e0 [ 33.681657] ? fput+0x140/0x140 [ 33.684903] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.689362] ____fput+0x15/0x20 [ 33.692605] task_work_run+0x199/0x270 [ 33.696458] ? task_work_cancel+0x210/0x210 [ 33.700743] ? _raw_spin_unlock+0x22/0x30 [ 33.704856] ? switch_task_namespaces+0x87/0xc0 [ 33.709489] do_exit+0x9b5/0x1ad0 [ 33.712910] ? mm_update_next_owner+0x930/0x930 [ 33.717543] ? rtnl_unlock+0xe/0x10 [ 33.721132] ? __tun_chr_ioctl+0x27a/0x3e50 [ 33.725415] ? unwind_get_return_address+0x14/0xa0 [ 33.730313] ? tun_chr_read_iter+0x1e0/0x1e0 [ 33.734685] ? putname+0xee/0x130 [ 33.738119] ? save_stack+0xa3/0xd0 [ 33.741710] ? save_stack+0x43/0xd0 [ 33.745297] ? kasan_slab_free+0x71/0xc0 [ 33.749321] ? kmem_cache_free+0x77/0x280 [ 33.753431] ? putname+0xee/0x130 [ 33.756845] ? do_sys_open+0x31b/0x6d0 [ 33.760700] ? __lock_is_held+0xb6/0x140 [ 33.764734] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 33.770585] ? tun_chr_compat_ioctl+0x30/0x30 [ 33.775045] ? tun_chr_ioctl+0x2a/0x40 [ 33.778896] ? tun_chr_ioctl+0x2a/0x40 [ 33.782746] ? do_vfs_ioctl+0x486/0x1520 [ 33.786770] ? _cond_resched+0x14/0x30 [ 33.790624] ? ioctl_preallocate+0x2b0/0x2b0 [ 33.794998] ? selinux_capable+0x40/0x40 [ 33.799027] ? putname+0xf3/0x130 [ 33.802446] do_group_exit+0x149/0x400 [ 33.806299] ? SyS_exit+0x30/0x30 [ 33.809715] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.814694] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.819416] SyS_exit_group+0x1d/0x20 [ 33.823179] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 33.827897] RIP: 0033:0x442aa8 [ 33.831053] RSP: 002b:00007ffdcb6208d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.838723] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442aa8 [ 33.845956] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.853191] RBP: 0000000000000082 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 33.860425] R10: 0000000000000000 R11: 0000000000000246 R12: 74656e2f7665642f [ 33.867661] R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000 [ 33.874905] 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 [ 33.893968] RIP: hrtimer_active+0x211/0x410 RSP: ffff8801c05e73f0 [ 33.900227] ---[ end trace 16d64b9edc71d4d0 ]--- [ 33.905030] Kernel panic - not syncing: Fatal exception [ 33.910426] Dumping ftrace buffer: [ 33.913941] (ftrace buffer empty) [ 33.917622] Kernel Offset: disabled [ 33.921215] Rebooting in 86400 seconds..