CPU spinning at 100% -------------------- Key: JGRP-525 URL: http://jira.jboss.com/jira/browse/JGRP-525 Project: JGroups Issue Type: Bug Reporter: Bela Ban Assigned To: Bela Ban Fix For: 2.5 This happened at the end of a perf.Test run, and I think the reason is unsynchronized access to the HashSet (stack trace below), where an entry in the hashmap links to itself (caused by concurrent access). IIRC, the solution was to synchronize access to HashSet/hashMap. "Incoming Thread,perf,192.168.0.5:7800" prio=10 tid=0x00002aaacb578c00 nid=0x1cef runnable [0x0000000040b75000..0x0000000040b75c10] java.lang.Thread.State: RUNNABLE at java.util.HashMap.put(HashMap.java:374) at java.util.HashSet.add(HashSet.java:200) at org.jgroups.protocols.BARRIER.up(BARRIER.java:101) at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:154) at org.jgroups.protocols.FD.up(FD.java:328) at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:298) at org.jgroups.protocols.MERGE2.up(MERGE2.java:145) at org.jgroups.protocols.Discovery.up(Discovery.java:220) at org.jgroups.protocols.MPING.up(MPING.java:151) at org.jgroups.protocols.TP$IncomingPacket.handleMyMessage(TP.java:1542) at org.jgroups.protocols.TP$IncomingPacket.run(TP.java:1491) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira