Tracer error occuring in some circumstances (hard to reproduce)

[Rafal Lewczuk]

java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449)
at java.util.AbstractList$Itr.next(AbstractList.java:420)
at com.jitlogic.zorka.core.spy.TraceRecord.fixup(TraceRecord.java:374)
at com.jitlogic.zorka.core.spy.TraceBuilder.submit(TraceBuilder.java:293)
at com.jitlogic.zorka.core.spy.TraceBuilder.pop(TraceBuilder.java:214)
at com.jitlogic.zorka.core.spy.TraceBuilder.traceReturn(TraceBuilder.java:144)
at com.jitlogic.zorka.core.spy.MainSubmitter.traceReturn(MainSubmitter.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)
at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)