[jboss-jira] [JBoss JIRA] Closed: (JGRP-979) TCP DataOutputStream.flush() hang

TCP DataOutputStream.flush() hang --------------------------------- Key: JGRP-979 URL: https://jira.jboss.org/jira/browse/JGRP-979 Project: JGroups Issue Type: Bug Affects Versions: 2.6.10.merge Environment: Ubuntu Server Linux: $ uname -a Linux jabber04 2.6.27-11-generic #1 SMP Thu Jan 29 19:28:32 UTC 2009 x86_64 GNU/Linux $ java -version java version "1.6.0_10" Java(TM) SE Runtime Environment (build 1.6.0_10-b33) Java HotSpot(TM) 64-Bit Server VM (build 11.0-b15, mixed mode) Reporter: Bulat Nigmatullin Assignee: Bela Ban Fix For: 2.6.10.merge Attachments: flush-tcp.xml, nohup.out, nohup1.out, nohup_2_node_cluster.tar.gz JGroups cluster consist of 2 nodes. It uses 2 JChannel: one for config purposes, another for data transfer. Sometimes randomly servers hangs up trying to send message to cluster. I think the main reason is this: "Timer-3,tcp,81.19.94.71:7800" daemon prio=10 tid=0x00007f155c7a1400 nid=0x3eec runnable [0x0000000042f92000..0x0000000042f92c80] java.lang.Thread.State: RUNNABLE at java.net.SocketOutputStream.socketWrite0(Native Method) at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109) at java.net.SocketOutputStream.write(SocketOutputStream.java:153) at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82) at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140) - locked <0x00007f15688678f0> (a java.io.BufferedOutputStream) at java.io.DataOutputStream.flush(DataOutputStream.java:123) at org.jgroups.blocks.BasicConnectionTable$Connection.doSend(BasicConnectionTable.java:546) at org.jgroups.blocks.BasicConnectionTable$Connection._send(BasicConnectionTable.java:522) at org.jgroups.blocks.BasicConnectionTable$Connection.send(BasicConnectionTable.java:506) at org.jgroups.blocks.BasicConnectionTable.send(BasicConnectionTable.java:322) at org.jgroups.protocols.TCP.send(TCP.java:55) at org.jgroups.protocols.BasicTCP.sendToSingleMember(BasicTCP.java:219) at org.jgroups.protocols.BasicTCP.sendToAllMembers(BasicTCP.java:204) at org.jgroups.protocols.TP.doSend(TP.java:1486) at org.jgroups.protocols.TP.access$2500(TP.java:49) at org.jgroups.protocols.TP$Bundler.sendBundledMessages(TP.java:2059) at org.jgroups.protocols.TP$Bundler.access$2900(TP.java:1951) at org.jgroups.protocols.TP$Bundler$BundlingTimer.run(TP.java:2088) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636) I've done few thread dumps during 30 minutes and this thread was in this state in every dump. See full thread dump in attachment. P.S. In log file OpenJDK used, but switch to Sun JDK result in the same errors. $ java -version java version "1.6.0_0" IcedTea6 1.3.1 (6b12-0ubuntu6.4) Runtime Environment (build 1.6.0_0-b12) OpenJDK 64-Bit Server VM (build 1.6.0_0-b12, mixed mode)