Program: 18416
Project: 18416
Buggy source:
public void operate(final IndexOperationCallback callback) throws SearchEngineException {
  final String[] subIndexes=searchEngineStore.getSubIndexes();
  final Lock[] writerLocks=new Lock[subIndexes.length];
  final Lock[] commitLocks=new Lock[subIndexes.length];
  try {
    try {
      if (log.isDebugEnabled()) {
        log.debug("String_Node_Str");
      }
      for (int i=0; i < subIndexes.length; i++) {
        Directory dir=getDirectory(subIndexes[i]);
        writerLocks[i]=dir.makeLock(IndexWriter.WRITE_LOCK_NAME);
        writerLocks[i].obtain(luceneSettings.getTransactionLockTimout());
      }
      if (log.isDebugEnabled()) {
        log.debug("String_Node_Str");
      }
    }
 catch (    Exception e) {
      throw new SearchEngineException("String_Node_Str",e);
    }
    if (log.isDebugEnabled()) {
      log.debug("String_Node_Str");
    }
    boolean continueToSecondStep=callback.firstStep();
    if (!continueToSecondStep) {
      return;
    }
    clearCache();
    notifyAllToClearCache();
    if (waitForCacheInvalidationBeforeSecondStep != 0 && luceneSettings.isWaitForCacheInvalidationOnIndexOperation()) {
      try {
        if (log.isDebugEnabled()) {
          log.debug("String_Node_Str" + waitForCacheInvalidationBeforeSecondStep + "String_Node_Str");
        }
        Thread.sleep(waitForCacheInvalidationBeforeSecondStep);
      }
 catch (      InterruptedException e) {
        log.debug("String_Node_Str",e);
        throw new SearchEngineException("String_Node_Str",e);
      }
    }
    if (log.isDebugEnabled()) {
      log.debug("String_Node_Str");
    }
    callback.secondStep();
  }
  finally {
    LuceneUtils.clearLocks(commitLocks);
    LuceneUtils.clearLocks(writerLocks);
  }
}

Fixed version (ground truth):
public void operate(final IndexOperationCallback callback) throws SearchEngineException {
  final String[] subIndexes=searchEngineStore.getSubIndexes();
  final Lock[] writerLocks=new Lock[subIndexes.length];
  try {
    try {
      if (log.isDebugEnabled()) {
        log.debug("String_Node_Str");
      }
      for (int i=0; i < subIndexes.length; i++) {
        Directory dir=getDirectory(subIndexes[i]);
        writerLocks[i]=dir.makeLock(IndexWriter.WRITE_LOCK_NAME);
        writerLocks[i].obtain(luceneSettings.getTransactionLockTimout());
      }
      if (log.isDebugEnabled()) {
        log.debug("String_Node_Str");
      }
    }
 catch (    Exception e) {
      throw new SearchEngineException("String_Node_Str",e);
    }
    if (log.isDebugEnabled()) {
      log.debug("String_Node_Str");
    }
    boolean continueToSecondStep=callback.firstStep();
    if (!continueToSecondStep) {
      return;
    }
    clearCache();
    notifyAllToClearCache();
    if (waitForCacheInvalidationBeforeSecondStep != 0 && luceneSettings.isWaitForCacheInvalidationOnIndexOperation()) {
      try {
        if (log.isDebugEnabled()) {
          log.debug("String_Node_Str" + waitForCacheInvalidationBeforeSecondStep + "String_Node_Str");
        }
        Thread.sleep(waitForCacheInvalidationBeforeSecondStep);
      }
 catch (      InterruptedException e) {
        log.debug("String_Node_Str",e);
        throw new SearchEngineException("String_Node_Str",e);
      }
    }
    if (log.isDebugEnabled()) {
      log.debug("String_Node_Str");
    }
    callback.secondStep();
  }
  finally {
    LuceneUtils.clearLocks(writerLocks);
  }
}