WARNING: kobject bug in should

R13: 000000000000032a R14: 00000000006f6c90 R15: 0000000000000007
------------[ cut here ]------------
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
kobject_add_internal failed for ifb0 (error: -12 parent: net)
WARNING: CPU: 0 PID: 16341 at lib/kobject.c:242 kobject_add_internal+0x3f6/0xbc0 lib/kobject.c:240
CPU: 1 PID: 16340 Comm: syz-executor2 Not tainted 4.16.0-rc7+ #6
Kernel panic - not syncing: panic_on_warn set ...

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
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail+0x8c0/0xa40 lib/fault-inject.c:149
 should_failslab+0xec/0x120 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:422 [inline]
 slab_alloc mm/slab.c:3366 [inline]
 kmem_cache_alloc_trace+0x4b/0x740 mm/slab.c:3606
 kmalloc include/linux/slab.h:512 [inline]
 bdi_split_work_to_wbs+0x589/0x11f0 fs/fs-writeback.c:831
 sync_inodes_sb+0x2f2/0x420 fs/fs-writeback.c:2425
 sync_inodes_one_sb+0x3b/0x50 fs/sync.c:74
 iterate_supers+0x12e/0x250 fs/super.c:598
 sys_sync+0xe4/0x1c0 fs/sync.c:113
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4548b9
RSP: 002b:00007fdb6fb64c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fdb6fb656d4 RCX: 00000000004548b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 000000000000064b R14: 00000000006fb7a8 R15: 0000000000000000
CPU: 0 PID: 16341 Comm: syz-executor4 Not tainted 4.16.0-rc7+ #6
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+0x1f4/0x2b0 lib/bug.c:186
 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:ffff88018f3cf570 EFLAGS: 00010282
RAX: dffffc0000000008 RBX: ffff8801ccc7c0e8 RCX: ffffffff815b7bde
RDX: 0000000000010000 RSI: ffffc90003e7e000 RDI: 0000000000000246
RBP: ffff88018f3cf668 R08: 1ffff10031e79e24 R09: 0000000000000000
R10: ffff88018f3cf330 R11: 0000000000000000 R12: 1ffff10031e79eb4
R13: 00000000fffffff4 R14: ffff8801d69fd580 R15: ffffffff87302160
 kobject_add_varg lib/kobject.c:364 [inline]
 kobject_add+0x132/0x1f0 lib/kobject.c:409
 device_add+0x35d/0x1650 drivers/base/core.c:1787
 netdev_register_kobject+0x183/0x360 net/core/net-sysfs.c:1604
 register_netdevice+0xb41/0x1020 net/core/dev.c:7900
 tun_set_iff drivers/net/tun.c:2596 [inline]
 __tun_chr_ioctl+0x20d7/0x4100 drivers/net/tun.c:2821
 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:3078
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4548b9
RSP: 002b:00007f71e797cc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f71e797d6d4 RCX: 00000000004548b9
RDX: 00000000200000c0 RSI: 00000000400454ca RDI: 0000000000000016
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000017
R13: 000000000000032a R14: 00000000006f6c90 R15: 0000000000000007
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..