kobject_add_internal failed for brport (error: -12 parent: syz4.0)
WARNING: CPU: 0 PID: 8677 at lib/kobject.c:244 kobject_add_internal+0x3f6/0xbc0 lib/kobject.c:242
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8677 Comm: syz-executor4 Not tainted 4.15.0-rc2+ #155
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+0x194/0x257 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:177
 fixup_bug arch/x86/kernel/traps.c:246 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:930
RIP: 0010:kobject_add_internal+0x3f6/0xbc0 lib/kobject.c:242
RSP: 0018:ffff8801cbeff7b8 EFLAGS: 00010282
RAX: dffffc0000000008 RBX: ffff8801cb7e0188 RCX: ffffffff815a047e
RDX: 0000000000010000 RSI: ffffc90001fe5000 RDI: ffff8801db416f18
RBP: ffff8801cbeff8b0 R08: 1ffff100397dfe74 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff100397dfefd
R13: 00000000fffffff4 R14: ffff8801c3dea9e8 R15: ffff8801d39960c0
 kobject_add_varg lib/kobject.c:366 [inline]
 kobject_init_and_add+0xf9/0x150 lib/kobject.c:438
 br_add_if+0x786/0x19a0 net/bridge/br_if.c:533
 add_del_if+0xfa/0x140 net/bridge/br_ioctl.c:101
 br_dev_ioctl+0xa2/0xc0 net/bridge/br_ioctl.c:396
 dev_ifsioc+0x333/0x9b0 net/core/dev_ioctl.c:354
 dev_ioctl+0x2c2/0xf90 net/core/dev_ioctl.c:566
 sock_do_ioctl+0x94/0xb0 net/socket.c:971
 sock_ioctl+0x2c2/0x440 net/socket.c:1061
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f8691b6bc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8691b6baa0 RCX: 0000000000452a39
RDX: 0000000020ec8fd8 RSI: 00000000000089a2 RDI: 0000000000000013
RBP: 00007f8691b6ba90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b75fb
R13: 00007f8691b6bbc8 R14: 00000000004b75fb R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..