executing program syzkaller login: [ 13.007999] kasan: CONFIG_KASAN_INLINE enabled [ 13.008548] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 13.009470] general protection fault: 0000 [#1] SMP KASAN [ 13.009994] Dumping ftrace buffer: [ 13.010344] (ftrace buffer empty) [ 13.010723] Modules linked in: [ 13.011066] CPU: 0 PID: 2969 Comm: syzkaller365868 Not tainted 4.14.0-rc5-next-20171018+ #8 [ 13.013477] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 13.014198] task: ffff88003a86e480 task.stack: ffff8800392f8000 [ 13.014737] RIP: 0010:hrtimer_active+0x211/0x410 [ 13.016306] RSP: 0018:ffff8800392ff3f0 EFLAGS: 00010246 [ 13.017128] RAX: 0000000000000000 RBX: 1ffff1000725feab RCX: ffffffff815ef89f [ 13.017786] RDX: 0000000000000000 RSI: ffffffff85b376a0 RDI: ffff88003a40cfa0 [ 13.019528] RBP: ffff8800392ff530 R08: ffffffff83f9e367 R09: 0000000000000004 [ 13.020483] R10: ffff8800392ff898 R11: 0000000000000000 R12: 0000000000000000 [ 13.021127] R13: 0000000000000000 R14: ffffed000725fe89 R15: dffffc0000000000 [ 13.021781] FS: 0000000000000000(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000 [ 13.022522] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 13.023044] CR2: 00007f9fd17be000 CR3: 0000000005a22000 CR4: 00000000000006f0 [ 13.023689] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 13.024343] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 13.027288] Call Trace: [ 13.027573] ? hrtimer_forward+0x2d0/0x2d0 [ 13.027973] ? __might_sleep+0x95/0x190 [ 13.028387] ? rtnl_lock+0x17/0x20 [ 13.028758] ? __mutex_lock+0x16f/0x19d0 [ 13.029181] ? rtnl_lock+0x17/0x20 [ 13.029550] ? fsnotify+0xb6f/0x1af0 [ 13.029920] ? rtnl_lock+0x17/0x20 [ 13.030294] hrtimer_try_to_cancel+0x91/0x5c0 [ 13.030701] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 13.031146] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 13.031669] ? __free_insn_slot+0x5c0/0x5c0 [ 13.032055] ? rcu_note_context_switch+0x710/0x710 [ 13.032495] ? __lock_is_held+0xb6/0x140 [ 13.032865] hrtimer_cancel+0x22/0x40 [ 13.033518] napi_disable+0x87/0xa0 [ 13.033825] __tun_detach+0xe26/0x1570 [ 13.034163] ? __kernel_text_address+0xd/0x40 [ 13.034567] ? unwind_get_return_address+0x61/0xa0 [ 13.035011] ? tun_attach+0x1080/0x1080 [ 13.035372] ? check_noncircular+0x20/0x20 [ 13.035753] ? locks_remove_file+0x3fa/0x5a0 [ 13.036148] ? fcntl_setlk+0x10c0/0x10c0 [ 13.036582] ? free_fs_struct+0x4f/0x60 [ 13.036949] ? __fsnotify_parent+0xb4/0x3a0 [ 13.037336] ? fsnotify+0x1af0/0x1af0 [ 13.037681] ? rcu_note_context_switch+0x710/0x710 [ 13.038122] ? __tun_detach+0x1570/0x1570 [ 13.038494] ? __tun_detach+0x1570/0x1570 [ 13.038866] tun_chr_close+0x44/0x60 [ 13.039276] __fput+0x327/0x7e0 [ 13.039576] ? fput+0x140/0x140 [ 13.039874] ? _raw_spin_unlock_irq+0x27/0x70 [ 13.040355] ____fput+0x15/0x20 [ 13.040653] task_work_run+0x199/0x270 [ 13.041002] ? task_work_cancel+0x210/0x210 [ 13.041401] ? _raw_spin_unlock+0x22/0x30 [ 13.041796] ? switch_task_namespaces+0x87/0xc0 [ 13.042241] do_exit+0x9b5/0x1ad0 [ 13.042583] ? mm_update_next_owner+0x930/0x930 [ 13.043000] ? rtnl_unlock+0xe/0x10 [ 13.043385] ? __tun_chr_ioctl+0x27a/0x3e50 [ 13.043772] ? unwind_get_return_address+0x14/0xa0 [ 13.044217] ? tun_chr_read_iter+0x1e0/0x1e0 [ 13.044671] ? putname+0xee/0x130 [ 13.044983] ? save_stack+0xa3/0xd0 [ 13.045289] ? save_stack+0x43/0xd0 [ 13.045598] ? kasan_slab_free+0x71/0xc0 [ 13.045958] ? kmem_cache_free+0x77/0x280 [ 13.046326] ? putname+0xee/0x130 [ 13.046635] ? do_sys_open+0x31b/0x6d0 [ 13.046987] ? __lock_is_held+0xb6/0x140 [ 13.047359] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 13.047886] ? tun_chr_compat_ioctl+0x30/0x30 [ 13.048286] ? tun_chr_ioctl+0x2a/0x40 [ 13.048686] ? tun_chr_ioctl+0x2a/0x40 [ 13.049035] ? do_vfs_ioctl+0x486/0x1520 [ 13.049396] ? _cond_resched+0x14/0x30 [ 13.049748] ? ioctl_preallocate+0x2b0/0x2b0 [ 13.050145] ? selinux_capable+0x40/0x40 [ 13.050510] ? putname+0xf3/0x130 [ 13.050824] do_group_exit+0x149/0x400 [ 13.051173] ? SyS_exit+0x30/0x30 [ 13.051486] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 13.051934] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 13.052359] SyS_exit_group+0x1d/0x20 [ 13.052763] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 13.053232] RIP: 0033:0x437c39 [ 13.053549] RSP: 002b:00007ffdd8f61f18 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 13.054550] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000437c39 [ 13.055275] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 13.055992] RBP: 0000000000000082 R08: 000000000000003c R09: 00000000000000e7 [ 13.056719] R10: ffffffffffffffc0 R11: 0000000000000246 R12: 74656e2f7665642f [ 13.057371] R13: 0000000000401cf0 R14: 0000000000401d80 R15: 0000000000000000 [ 13.058124] 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 [ 13.059943] RIP: hrtimer_active+0x211/0x410 RSP: ffff8800392ff3f0 [ 13.060392] ---[ end trace d8ce9953e41be713 ]--- [ 13.060814] Kernel panic - not syncing: Fatal exception [ 13.061344] Dumping ftrace buffer: [ 13.061590] (ftrace buffer empty) [ 13.061808] Kernel Offset: disabled [ 13.062031] Rebooting in 86400 seconds..