Index: lucene/src/test/org/apache/lucene/index/TestIndexWriterWithThreads.java
===================================================================
--- lucene/src/test/org/apache/lucene/index/TestIndexWriterWithThreads.java	(revision 1140474)
+++ lucene/src/test/org/apache/lucene/index/TestIndexWriterWithThreads.java	(working copy)
@@ -184,6 +184,8 @@
           if (threads[i].addCount > 0) {
             done = true;
             break;
+          } else if (!threads[i].isAlive()) {
+            fail("thread failed before indexing a single document");
           }
       }