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-8,10.128.0.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 41.309786] kasan: CONFIG_KASAN_INLINE enabled [ 41.310567] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 41.311677] general protection fault: 0000 [#1] SMP KASAN [ 41.312409] Dumping ftrace buffer: [ 41.312881] (ftrace buffer empty) [ 41.313385] Modules linked in: [ 41.313817] CPU: 0 PID: 2984 Comm: syzkaller897630 Not tainted 4.14.0-rc2-next-20170927+ #30 [ 41.314954] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.316171] task: ffff8801ce54e140 task.stack: ffff8801ce730000 [ 41.316974] RIP: 0010:hrtimer_active+0x211/0x410 [ 41.317602] RSP: 0018:ffff8801ce7373f0 EFLAGS: 00010246 [ 41.318338] RAX: 0000000000000000 RBX: 1ffff10039ce6eab RCX: 1ffff10039ce6ee4 [ 41.319287] RDX: 0000000000000000 RSI: ffffffff85b3c180 RDI: ffff8801ce25a6e0 [ 41.320237] RBP: ffff8801ce737530 R08: ffffffff83ee1af7 R09: ffff8801ce736e00 [ 41.321187] R10: ffff8801ce737898 R11: 1ffff10039ca9ebb R12: 0000000000000000 [ 41.322137] R13: 0000000000000000 R14: ffffed0039ce6e89 R15: dffffc0000000000 [ 41.323089] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 41.324162] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.324934] CR2: 0000000020124ff3 CR3: 00000001bfcc8000 CR4: 00000000001406f0 [ 41.325936] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.326889] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.327854] Call Trace: [ 41.328215] ? hrtimer_forward+0x2d0/0x2d0 [ 41.328783] ? __might_sleep+0x95/0x190 [ 41.329317] ? rtnl_lock+0x17/0x20 [ 41.329805] ? __mutex_lock+0x16f/0x19d0 [ 41.333245] ? rtnl_lock+0x17/0x20 [ 41.336752] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 41.341907] ? fsnotify+0xb6f/0x1af0 [ 41.345586] ? rtnl_lock+0x17/0x20 [ 41.349097] ? tun_get_drvinfo+0x2b0/0x2b0 [ 41.353298] hrtimer_try_to_cancel+0x91/0x5c0 [ 41.357768] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 41.362669] ? tun_get_drvinfo+0x2b0/0x2b0 [ 41.366875] ? trace_event_raw_event_sched_switch+0x770/0x770 [ 41.372726] ? rcu_note_context_switch+0x710/0x710 [ 41.377623] ? __lock_is_held+0xbc/0x140 [ 41.381652] ? tun_get_drvinfo+0x2b0/0x2b0 [ 41.385852] hrtimer_cancel+0x22/0x40 [ 41.389617] napi_disable+0x87/0xa0 [ 41.393208] __tun_detach+0xe26/0x1570 [ 41.397063] ? fasync_remove_entry+0x38/0x230 [ 41.401527] ? check_noncircular+0x20/0x20 [ 41.405727] ? tun_attach+0x1070/0x1070 [ 41.409671] ? do_raw_spin_trylock+0x190/0x190 [ 41.414228] ? fcntl_setlk+0x10d0/0x10d0 [ 41.418259] ? _raw_spin_unlock+0x22/0x30 [ 41.422374] ? fasync_remove_entry+0x1be/0x230 [ 41.426922] ? __tun_detach+0x1570/0x1570 [ 41.431033] ? tun_get_drvinfo+0x2b0/0x2b0 [ 41.435231] ? __tun_detach+0x1570/0x1570 [ 41.439342] ? tun_get_drvinfo+0x2b0/0x2b0 [ 41.443554] tun_chr_close+0x44/0x60 [ 41.447232] __fput+0x333/0x7f0 [ 41.450477] ? fput+0x140/0x140 [ 41.453722] ? _raw_spin_unlock_irq+0x27/0x70 [ 41.458183] ____fput+0x15/0x20 [ 41.461428] task_work_run+0x199/0x270 [ 41.465289] ? task_work_cancel+0x210/0x210 [ 41.469580] ? _raw_spin_unlock+0x22/0x30 [ 41.473691] ? switch_task_namespaces+0x87/0xc0 [ 41.478326] do_exit+0x9c8/0x1b00 [ 41.481745] ? mm_update_next_owner+0x930/0x930 [ 41.486379] ? rtnl_unlock+0xe/0x10 [ 41.489970] ? __tun_chr_ioctl+0x27a/0x3e40 [ 41.494255] ? unwind_get_return_address+0x34/0xa0 [ 41.499155] ? tun_chr_read_iter+0x1e0/0x1e0 [ 41.503530] ? putname+0xee/0x130 [ 41.506949] ? save_stack+0xa3/0xd0 [ 41.510540] ? save_stack_trace+0x16/0x20 [ 41.514650] ? save_stack+0x43/0xd0 [ 41.518239] ? kasan_slab_free+0x71/0xc0 [ 41.522264] ? kmem_cache_free+0x77/0x280 [ 41.526376] ? putname+0xee/0x130 [ 41.529798] ? __lock_is_held+0xbc/0x140 [ 41.533832] ? trace_event_raw_event_sched_switch+0x770/0x770 [ 41.539691] ? tun_chr_compat_ioctl+0x30/0x30 [ 41.544149] ? tun_chr_ioctl+0x2a/0x40 [ 41.547999] ? tun_chr_ioctl+0x2a/0x40 [ 41.551853] ? do_vfs_ioctl+0x492/0x1530 [ 41.555878] ? _cond_resched+0x14/0x30 [ 41.559730] ? ioctl_preallocate+0x2b0/0x2b0 [ 41.564106] ? selinux_capable+0x40/0x40 [ 41.568131] ? putname+0xf3/0x130 [ 41.571554] do_group_exit+0x149/0x400 [ 41.575408] ? SyS_exit+0x30/0x30 [ 41.578829] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 41.584157] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 41.588878] SyS_exit_group+0x1d/0x20 [ 41.592645] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 41.597375] RIP: 0033:0x442aa8 [ 41.600528] RSP: 002b:00007ffe65ec0ae8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 41.608204] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442aa8 [ 41.615438] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 41.622672] RBP: 0000000000000086 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 41.629910] R10: 0000000000000000 R11: 0000000000000246 R12: 74656e2f7665642f [ 41.637143] R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000 [ 41.644387] 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 [ 41.663455] RIP: hrtimer_active+0x211/0x410 RSP: ffff8801ce7373f0 [ 41.669709] ---[ end trace 52c6225e689655b2 ]--- [ 41.674541] Kernel panic - not syncing: Fatal exception [ 41.680271] Dumping ftrace buffer: [ 41.683793] (ftrace buffer empty) [ 41.687468] Kernel Offset: disabled [ 41.691061] Rebooting in 86400 seconds..