R13: 000000000000032a R14: 00000000006f7c90 R15: 0000000000000003
------------[ cut here ]------------
kobject_add_internal failed for tx-1 (error: -12 parent: queues)
WARNING: CPU: 1 PID: 4166 at lib/kobject.c:242 kobject_add_internal+0x42c/0xba0 lib/kobject.c:240
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4166 Comm: syz-executor6 Not tainted 4.16.0+ #2
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+0x1b/0x40 arch/x86/entry/entry_64.S:991
RIP: 0010:kobject_add_internal+0x42c/0xba0 lib/kobject.c:240
RSP: 0018:ffff88018fd6f478 EFLAGS: 00010282
RAX: 0000000000000040 RBX: ffff88018c802098 RCX: ffffc90007af6000
RDX: 0000000000040000 RSI: ffffffff815fa581 RDI: ffff88018fd6efd8
RBP: ffff88018fd6f570 R08: ffff8801d92a4540 R09: 0000000000000006
R10: ffff8801d92a4540 R11: 0000000000000000 R12: 00000000fffffff4
R13: ffff8801b9269948 R14: ffffffff882ac2a0 R15: ffff8801b9269900
 kobject_add_varg lib/kobject.c:364 [inline]
 kobject_init_and_add+0xed/0x130 lib/kobject.c:435
 netdev_queue_add_kobject net/core/net-sysfs.c:1332 [inline]
 netdev_queue_update_kobjects+0x165/0x4e0 net/core/net-sysfs.c:1360
 netif_set_real_num_tx_queues+0x1c0/0x700 net/core/dev.c:2424
 tun_set_real_num_queues drivers/net/tun.c:638 [inline]
 tun_attach+0x7d9/0x12f0 drivers/net/tun.c:871
 tun_set_iff drivers/net/tun.c:2562 [inline]
 __tun_chr_ioctl+0x27a9/0x4420 drivers/net/tun.c:2894
 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:3166
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 SYSC_ioctl fs/ioctl.c:708 [inline]
 SyS_ioctl+0x24/0x30 fs/ioctl.c:706
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x455319
RSP: 002b:00007f9271045c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f92710466d4 RCX: 0000000000455319
RDX: 0000000020000140 RSI: 00000000400454ca RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015
R13: 000000000000032a R14: 00000000006f7c90 R15: 0000000000000003
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..