executing program syzkaller login: [ 17.771152] kasan: CONFIG_KASAN_INLINE enabled [ 17.771664] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 17.772448] general protection fault: 0000 [#1] SMP KASAN [ 17.774681] Dumping ftrace buffer: [ 17.775046] (ftrace buffer empty) [ 17.775471] Modules linked in: [ 17.775807] CPU: 1 PID: 2965 Comm: syzkaller594468 Not tainted 4.14.0-rc5-next-20171018+ #8 [ 17.776650] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 17.777469] task: ffff88006cae41c0 task.stack: ffff880069558000 [ 17.778063] RIP: 0010:hrtimer_active+0x211/0x410 [ 17.780164] RSP: 0018:ffff88006955f3f0 EFLAGS: 00010246 [ 17.780501] RAX: 0000000000000000 RBX: 1ffff1000d2abeab RCX: ffffffff815ef89f [ 17.780969] RDX: 0000000000000000 RSI: ffffffff85b376a0 RDI: ffff88003e0d9120 [ 17.781434] RBP: ffff88006955f530 R08: ffffffff83f9e367 R09: 0000000000000004 [ 17.781916] R10: ffff88006955f898 R11: 0000000000000000 R12: 0000000000000000 [ 17.782457] R13: 0000000000000000 R14: ffffed000d2abe89 R15: dffffc0000000000 [ 17.783155] FS: 0000000000000000(0000) GS:ffff88003ed00000(0000) knlGS:0000000000000000 [ 17.783976] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 17.784556] CR2: 0000000020124ff3 CR3: 0000000005a22000 CR4: 00000000000006e0 [ 17.785274] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 17.785999] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 17.786700] Call Trace: [ 17.786951] ? hrtimer_forward+0x2d0/0x2d0 [ 17.787335] ? __might_sleep+0x95/0x190 [ 17.787690] ? rtnl_lock+0x17/0x20 [ 17.788009] ? __mutex_lock+0x16f/0x19d0 [ 17.788374] ? rtnl_lock+0x17/0x20 [ 17.788627] ? fsnotify+0xb6f/0x1af0 [ 17.788851] ? rtnl_lock+0x17/0x20 [ 17.789082] ? tun_get_drvinfo+0x2b0/0x2b0 [ 17.789335] hrtimer_try_to_cancel+0x91/0x5c0 [ 17.789617] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 17.791124] ? tun_get_drvinfo+0x2b0/0x2b0 [ 17.791519] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 17.792052] ? __free_insn_slot+0x5c0/0x5c0 [ 17.792447] ? rcu_note_context_switch+0x710/0x710 [ 17.792895] ? __lock_is_held+0xb6/0x140 [ 17.793286] ? tun_get_drvinfo+0x2b0/0x2b0 [ 17.793673] hrtimer_cancel+0x22/0x40 [ 17.794022] napi_disable+0x87/0xa0 [ 17.794353] __tun_detach+0xe26/0x1570 [ 17.794813] ? fasync_remove_entry+0x1b8/0x230 [ 17.795276] ? tun_attach+0x1080/0x1080 [ 17.795671] ? do_raw_spin_trylock+0x190/0x190 [ 17.796134] ? check_noncircular+0x20/0x20 [ 17.796574] ? fcntl_setlk+0x10c0/0x10c0 [ 17.797003] ? _raw_spin_unlock+0x22/0x30 [ 17.797427] ? fasync_remove_entry+0x1b8/0x230 [ 17.797886] ? __tun_detach+0x1570/0x1570 [ 17.798297] ? tun_get_drvinfo+0x2b0/0x2b0 [ 17.798722] ? __tun_detach+0x1570/0x1570 [ 17.799135] ? tun_get_drvinfo+0x2b0/0x2b0 [ 17.799582] tun_chr_close+0x44/0x60 [ 17.799955] __fput+0x327/0x7e0 [ 17.800291] ? fput+0x140/0x140 [ 17.800633] ? _raw_spin_unlock_irq+0x27/0x70 [ 17.801129] ____fput+0x15/0x20 [ 17.801431] task_work_run+0x199/0x270 [ 17.801803] ? task_work_cancel+0x210/0x210 [ 17.802217] ? _raw_spin_unlock+0x22/0x30 [ 17.802599] ? switch_task_namespaces+0x87/0xc0 [ 17.803026] do_exit+0x9b5/0x1ad0 [ 17.803347] ? mm_update_next_owner+0x930/0x930 [ 17.803770] ? rtnl_unlock+0xe/0x10 [ 17.804100] ? __tun_chr_ioctl+0x27a/0x3e50 [ 17.804490] ? unwind_get_return_address+0x14/0xa0 [ 17.804946] ? tun_chr_read_iter+0x1e0/0x1e0 [ 17.805399] ? putname+0xee/0x130 [ 17.805714] ? save_stack+0xa3/0xd0 [ 17.806044] ? save_stack+0x43/0xd0 [ 17.806371] ? kasan_slab_free+0x71/0xc0 [ 17.806739] ? kmem_cache_free+0x77/0x280 [ 17.807111] ? putname+0xee/0x130 [ 17.807427] ? do_sys_open+0x31b/0x6d0 [ 17.807787] ? __lock_is_held+0xb6/0x140 [ 17.808171] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 17.808705] ? tun_chr_compat_ioctl+0x30/0x30 [ 17.809164] ? tun_chr_ioctl+0x2a/0x40 [ 17.809516] ? tun_chr_ioctl+0x2a/0x40 [ 17.809866] ? do_vfs_ioctl+0x486/0x1520 [ 17.810227] ? _cond_resched+0x14/0x30 [ 17.810581] ? ioctl_preallocate+0x2b0/0x2b0 [ 17.810994] ? selinux_capable+0x40/0x40 [ 17.811659] ? putname+0xf3/0x130 [ 17.811979] do_group_exit+0x149/0x400 [ 17.812342] ? SyS_exit+0x30/0x30 [ 17.812672] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 17.813154] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 17.813588] SyS_exit_group+0x1d/0x20 [ 17.813936] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 17.814367] RIP: 0033:0x437c39 [ 17.814656] RSP: 002b:00007ffc157c7058 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 17.815320] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000437c39 [ 17.815979] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 17.816624] RBP: 0000000000000082 R08: 000000000000003c R09: 00000000000000e7 [ 17.817332] R10: ffffffffffffffc0 R11: 0000000000000246 R12: 74656e2f7665642f [ 17.817976] R13: 0000000000401cf0 R14: 0000000000401d80 R15: 0000000000000000 [ 17.818637] 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 [ 17.820471] RIP: hrtimer_active+0x211/0x410 RSP: ffff88006955f3f0 [ 17.821121] ---[ end trace adc4ca04c4eb758b ]--- [ 17.821824] Kernel panic - not syncing: Fatal exception [ 17.825046] Dumping ftrace buffer: [ 17.825424] (ftrace buffer empty) [ 17.825800] Kernel Offset: disabled [ 17.826173] Rebooting in 86400 seconds..