------------[ cut here ]------------
Cannot find parent device
WARNING: CPU: 1 PID: 21587 at net/batman-adv/hard-interface.c:182 batadv_is_on_batman_iface+0x3e8/0x450 net/batman-adv/hard-interface.c:182
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 21587 Comm: syz-executor2 Not tainted 4.20.0+ #13
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+0x1db/0x2d0 lib/dump_stack.c:113
 panic+0x2cb/0x589 kernel/panic.c:189
 __warn.cold+0x20/0x4b kernel/panic.c:544
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:batadv_is_on_batman_iface+0x3e8/0x450 net/batman-adv/hard-interface.c:182
Code: ff ff 4c 89 7d c8 e9 ff fe ff ff 48 8b 7d c0 e8 2e 8f f4 f9 e9 ff fc ff ff e8 24 9d b0 f9 48 c7 c7 40 13 fb 88 e8 68 f4 79 f9 <0f> 0b eb bb e8 2f 8f f4 f9 e9 45 fc ff ff 48 8b 7d c8 e8 21 8f f4
RSP: 0018:ffff8880624d7590 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888065276cc0 RCX: ffffc90009df9000
RDX: 000000000001513b RSI: ffffffff816849b6 RDI: 0000000000000006
RBP: ffff8880624d75d8 R08: ffff88808691e100 R09: ffff88808691e9c8
R10: ffff88808691e100 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88808721c0c0 R14: 0000000000000030 R15: ffff88808721c0c0
 batadv_is_on_batman_iface+0x349/0x450 net/batman-adv/hard-interface.c:188
 batadv_is_valid_iface net/batman-adv/hard-interface.c:205 [inline]
 batadv_hardif_add_interface net/batman-adv/hard-interface.c:917 [inline]
 batadv_hard_if_event+0x935/0x1240 net/batman-adv/hard-interface.c:1043
 notifier_call_chain+0x179/0x380 kernel/notifier.c:93
 __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401
 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1739
 call_netdevice_notifiers_extack net/core/dev.c:1751 [inline]
 call_netdevice_notifiers net/core/dev.c:1765 [inline]
 register_netdevice+0xae0/0x10b0 net/core/dev.c:8658
 register_vlan_dev+0x2f9/0x7a0 net/8021q/vlan.c:172
 register_vlan_device net/8021q/vlan.c:273 [inline]
 vlan_ioctl_handler+0xedf/0x135d net/8021q/vlan.c:617
 sock_ioctl+0x3de/0x6c0 net/socket.c:1052
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f243dc62c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000020000080 RSI: 0800000000008982 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f243dc636d4
R13: 00000000004bf0f5 R14: 00000000004d06d0 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..