unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Zero length message leads to an empty skb netlink: 60 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'.