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 tx-1 (error: -12 parent: queues)
WARNING: CPU: 0 PID: 13900 at lib/kobject.c:242 kobject_add_internal+0x3f6/0xbc0 lib/kobject.c:240
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 13900 Comm: syz-executor4 Not tainted 4.16.0-rc4+ #251
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 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:986
RIP: 0010:kobject_add_internal+0x3f6/0xbc0 lib/kobject.c:240
RSP: 0018:ffff8801d37a7598 EFLAGS: 00010286
RAX: dffffc0000000008 RBX: ffff8801a5602098 RCX: ffffffff815abb7e
RDX: 0000000000010000 RSI: ffffc90003449000 RDI: 1ffff1003a6f4e38
RBP: ffff8801d37a7690 R08: 1ffff1003a6f4dfa R09: 0000000000000000
R10: ffff8801d37a7358 R11: 0000000000000000 R12: 1ffff1003a6f4eb9
R13: 00000000fffffff4 R14: ffff8801cbc29a48 R15: ffffffff8684c720
 kobject_add_varg lib/kobject.c:364 [inline]
 kobject_init_and_add+0xf9/0x150 lib/kobject.c:436
 netdev_queue_add_kobject net/core/net-sysfs.c:1332 [inline]
 netdev_queue_update_kobjects+0x148/0x480 net/core/net-sysfs.c:1360
 netif_set_real_num_tx_queues+0x185/0x790 net/core/dev.c:2397
 tun_set_real_num_queues drivers/net/tun.c:638 [inline]
 tun_attach+0x7bd/0x1220 drivers/net/tun.c:863
 tun_set_queue drivers/net/tun.c:2750 [inline]
 __tun_chr_ioctl+0x8f5/0x40d0 drivers/net/tun.c:2814
 tun_chr_compat_ioctl+0x29/0x30 drivers/net/tun.c:3112
 C_SYSC_ioctl fs/compat_ioctl.c:1461 [inline]
 compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1407
 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f44c99
RSP: 002b:00000000f774009c EFLAGS: 00000286 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 00000000400454d9
RDX: 0000000020000040 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..