error handling UDP packet: dns: overflow unpacking opt

[cococle]

2020/09/11 12:26:02 [info] error handling UDP packet: dns: overflow unpacking opt 2020/09/11 12:26:02 [info] error handling UDP packet: dns: overflow unpacking opt 2020/09/11 12:26:02 [info] error handling UDP packet: dns: overflow unpacking opt 2020/09/11 12:26:02 [info] error handling UDP packet: dns: overflow unpacking opt 2020/09/11 12:26:02 [info] error handling UDP packet: dns: overflow unpacking opt 2020/09/11 12:26:02 [info] error handling UDP packet: dns: overflow unpacking opt 2020/09/11 12:15:17 [info] Entering the UDP listener loop on [::]:53 2020/09/11 12:15:17 [info] Entering the tcp listener loop on [::]:53 2020/09/11 12:15:17 [info] Listening to tcp://[::]:53 2020/09/11 12:15:17 [info] Creating the TCP server socket 2020/09/11 12:15:17 [info] Listening to udp://[::]:53 2020/09/11 12:15:17 [info] Creating the UDP server socket 2020/09/11 12:15:17 [info] DNS cache is enabled 2020/09/11 12:15:17 [info] The server is configured to refuse ANY requests 2020/09/11 12:15:17 [info] Cache TTL override is enabled. Min=3600, Max=3600 2020/09/11 12:15:17 [info] Starting the DNS proxy server 2020/09/11 12:15:17 [info] Stopped the DNS proxy server 2020/09/11 12:15:17 [info] udpListen.ReadFrom() returned because we're reading from a closed connection, exiting loop 2020/09/11 12:15:17 [info] tcpListen.Accept() returned because we're reading from a closed connection, exiting loop 2020/09/11 12:15:17 [info] Stopping the DNS proxy server 2020/09/11 12:15:17 [info] Start reconfiguring the server

以上是日志，为什么会报溢出的错误呢？