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java.util.ConcurrentModificationException: null	at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:761)	at java.util.LinkedList$ListItr.next(LinkedList.java:696)	at org.apache.hadoop.yarn.ContainerLogAppender.close(ContainerLogAppender.java:81)	at org.apache.hadoop.yarn.TestContainerLogAppender.testAppendInClose(TestContainerLogAppender.java:44)