java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at hudson.model.queue.MappingWorksheet$ReadOnlyList.get(MappingWorksheet.java:102)
	at hudson.model.queue.MappingWorksheet$ExecutorChunk.execute(MappingWorksheet.java:150)
	at hudson.model.queue.MappingWorksheet$ExecutorChunk.access$000(MappingWorksheet.java:110)
	at hudson.model.queue.MappingWorksheet$Mapping.execute(MappingWorksheet.java:298)
	at hudson.model.Queue.maintain(Queue.java:1045)
	at hudson.model.Queue.pop(Queue.java:863)
	at hudson.model.Executor.grabJob(Executor.java:285)
	at hudson.model.Executor.run(Executor.java:206)

assert capacity() >= wc.size();
int e = 0;
for (SubTask s : wc) {
    while (!get(e).isAvailable()) // IOOBE
        e++;
    get(e++).set(wuc.createWorkUnit(s));
}