RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
------------[ cut here ]------------
kobject_add_internal failed for ifb0 (error: -12 parent: net)
WARNING: CPU: 0 PID: 9732 at lib/kobject.c:242 kobject_add_internal+0x42c/0xba0 lib/kobject.c:240
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 9732 Comm: syz-executor4 Not tainted 4.17.0-rc2+ #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:kobject_add_internal+0x42c/0xba0 lib/kobject.c:240
RSP: 0018:ffff8801938076d0 EFLAGS: 00010282
RAX: 000000000000003d RBX: ffff8801949730a8 RCX: ffffc90002a35000
RDX: 0000000000040000 RSI: ffffffff8160f4e1 RDI: ffff880193807230
RBP: ffff8801938077c8 R08: ffff8801d87ea580 R09: 0000000000000006
R10: ffff8801d87ea580 R11: 0000000000000000 R12: 00000000fffffff4
R13: ffff8801d65a2180 R14: ffffffff884c5f40 R15: ffff8801d9bcaf00
 kobject_add_varg lib/kobject.c:364 [inline]
 kobject_add+0x13a/0x190 lib/kobject.c:408
 device_add+0x3a5/0x16d0 drivers/base/core.c:1796
 netdev_register_kobject+0x180/0x380 net/core/net-sysfs.c:1604
 register_netdevice+0x997/0x11c0 net/core/dev.c:7961
 tun_set_iff drivers/net/tun.c:2660 [inline]
 __tun_chr_ioctl+0x23a1/0x4420 drivers/net/tun.c:2889
 tun_chr_compat_ioctl+0x29/0x30 drivers/net/tun.c:3189
 __do_compat_sys_ioctl fs/compat_ioctl.c:1461 [inline]
 __se_compat_sys_ioctl fs/compat_ioctl.c:1407 [inline]
 __ia32_compat_sys_ioctl+0x221/0x640 fs/compat_ioctl.c:1407
 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7fdccb9
RSP: 002b:00000000f5fd80ac EFLAGS: 00000282 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 00000000400454ca
RDX: 00000000200000c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..