Major Description
Hit this last night while running my usual sort of test: ie members leaving and joining
Exception in thread "FD_SOCK pinger,Clumpy Test Cluster,CFS-A-tinkywinky" java.lang.ArrayIndexOutOfBoundsException: 0
at java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:368)
at java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:377)
at org.jgroups.protocols.FD_SOCK.determinePingDest(FD_SOCK.java:783)
at org.jgroups.protocols.FD_SOCK.run(FD_SOCK.java:385)
at java.lang.Thread.run(Thread.java:722)
Presumably there's insufficient synchronization around pingable_mbrs in FD_SOCK.
Similar to JGRP-1411.
