[jboss-jira] [JBoss JIRA] (JGRP-2257) UDP#PacketReceiver stuck in busy loop when socket throws closed exception but socket is not closed

UDP#PacketReceiver stuck in busy loop when socket throws closed exception but socket is not closed -------------------------------------------------------------------------------------------------- Key: JGRP-2257 URL: https://issues.jboss.org/browse/JGRP-2257 Project: JGroups Issue Type: Bug Affects Versions: 3.6.12 Environment: Windows Server 2016, 32GBytes memory running as a Hyper-V guest java version "1.8.0_131" Java(TM) SE Runtime Environment (build 1.8.0_131-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode) It was reported with just a single node running. Reporter: Paul Illingworth Assignee: Bela Ban Fix For: 4.0.12 I have a had a report of a scenario where it looks like the UDP#PacketReceiver is stuck spinning in a busy loop. The following is a snippet of the log file from the system in question. {noformat} 2018-03-16 14:05:43,273 SEVERE [] (214,unicast receiver,shared=udp) JGRP000190: failed receiving packet java.net.SocketException: socket closed at java.net.TwoStacksPlainDatagramSocketImpl.peekData(Native Method) at java.net.DatagramSocket.receive(DatagramSocket.java:743) at org.jgroups.protocols.UDP$PacketReceiver.run(UDP.java:694) at java.lang.Thread.run(Thread.java:748) 2018-03-16 14:05:43,273 SEVERE [] (214,unicast receiver,shared=udp) JGRP000190: failed receiving packet java.net.SocketException: socket closed at java.net.TwoStacksPlainDatagramSocketImpl.peekData(Native Method) at java.net.DatagramSocket.receive(DatagramSocket.java:743) at org.jgroups.protocols.UDP$PacketReceiver.run(UDP.java:694) at java.lang.Thread.run(Thread.java:748) 2018-03-16 14:05:43,273 SEVERE [] (214,unicast receiver,shared=udp) JGRP000190: failed receiving packet java.net.SocketException: socket closed at java.net.TwoStacksPlainDatagramSocketImpl.peekData(Native Method) at java.net.DatagramSocket.receive(DatagramSocket.java:743) at org.jgroups.protocols.UDP$PacketReceiver.run(UDP.java:694) at java.lang.Thread.run(Thread.java:748) {noformat} Looking at the code it looks like the call to receive a packet {code:java} receiver_socket.receive(packet); {code} results in an exception being thrown because the socket is closed but then when the exception is caught {code:java} if(receiver_socket.isClosed()) { {code} method is queried which says the socket has not been closed and the loop then continues for ever. I guess this is related to JGRP-1669. To quote _I hope there is no condition which causes the socket receive() to spit out endless exceptions while not being closed..._