RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000000001ff R14: 00000000006f7088 R15: 0000000000000006
------------[ cut here ]------------
kobject_add_internal failed for ppp0 (error: -12 parent: net)
WARNING: CPU: 1 PID: 13100 at lib/kobject.c:242 kobject_add_internal+0x10fc/0x1700 lib/kobject.c:240
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 13100 Comm: syz-executor7 Not tainted 4.16.0+ #87
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+0x185/0x1d0 lib/dump_stack.c:53
 panic+0x39d/0x940 kernel/panic.c:183
 __warn+0x40f/0x580 kernel/panic.c:547
 report_bug+0x72a/0x880 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x1aa/0x600 arch/x86/kernel/traps.c:297
 do_invalid_op+0x46/0x50 arch/x86/kernel/traps.c:316
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:kobject_add_internal+0x10fc/0x1700 lib/kobject.c:240
RSP: 0018:ffff880181d0f558 EFLAGS: 00010282
RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffc90002da3000 RSI: 000000000001ce15 RDI: 000000000001ce16
RBP: ffff880181d0f5f0 R08: 0000000001080020 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000fffffff4 R14: ffffffff8a8f750c R15: ffff880148d1a698
 kobject_add_varg lib/kobject.c:364 [inline]
 kobject_add+0x413/0x480 lib/kobject.c:409
 device_add+0x8dc/0x2cb0 drivers/base/core.c:1787
 netdev_register_kobject+0x283/0x6d0 net/core/net-sysfs.c:1604
 register_netdevice+0x18a7/0x26d0 net/core/dev.c:7900
 ppp_unit_register drivers/net/ppp/ppp_generic.c:1010 [inline]
 ppp_dev_configure+0xfb0/0x1220 drivers/net/ppp/ppp_generic.c:1066
 ppp_create_interface drivers/net/ppp/ppp_generic.c:3030 [inline]
 ppp_unattached_ioctl drivers/net/ppp/ppp_generic.c:865 [inline]
 ppp_ioctl+0xe1a/0x5200 drivers/net/ppp/ppp_generic.c:601
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xaf0/0x2440 fs/ioctl.c:686
 SYSC_ioctl+0x1d2/0x260 fs/ioctl.c:701
 SyS_ioctl+0x54/0x80 fs/ioctl.c:692
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455979
RSP: 002b:00007f4b91403c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4b914046d4 RCX: 0000000000455979
RDX: 0000000020000f0a RSI: 00000000c004743e RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000000001ff R14: 00000000006f7088 R15: 0000000000000006
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..