Program: 178823
Project: 178823
Buggy source:
final boolean fillAttributes(){
  int len=unknown.length();
  if (len > 0) {
    if (unknownOffset >= 0) {
      positionIncrementAtt.setPositionIncrement(0);
    }
    int offset=reader.offset();
    if (matchCell != null) {
      offset-=matchCell.depth;
    }
    if (unknownOffset == -1) {
      termAtt.copyBuffer(unknown.buffer,0,len);
      offsetAtt.setOffset(offset - len,offset);
    }
 else {
      termAtt.copyBuffer(unknown.buffer,unknownOffset,2);
      offset=offset - len + unknownOffset;
      offsetAtt.setOffset(offset,offset + 2);
    }
    unknownOffset++;
    typeAtt.setType("String_Node_Str");
    if (len <= 2 || unknownOffset >= len - 1) {
      unknown.reset();
      unknownOffset=-1;
    }
    return true;
  }
  if (matchCell == null) {
    return false;
  }
  int offset=reader.offset();
  if (cellWordOffset > 0) {
    positionIncrementAtt.setPositionIncrement(0);
  }
  typeAtt.setType(matchCell.type);
  if (matchCell.type != "String_Node_Str") {
    termAtt.copyBuffer(pending.buffer,0,pending.length());
    offsetAtt.setOffset(offset - pending.length(),offset);
    matchCell=null;
    cellWordOffset=0;
  }
 else {
    char[][] words=matchCell.words;
    char[] word=words[cellWordOffset];
    termAtt.copyBuffer(word,0,word.length);
    int start=offset - matchCell.depth + matchCell.offsets[cellWordOffset];
    offsetAtt.setOffset(start,start + word.length);
    cellWordOffset++;
    if (cellWordOffset == words.length) {
      matchCell=null;
      cellWordOffset=0;
    }
  }
  return true;
}

Fixed version (ground truth):
final boolean fillAttributes(){
  int len=unknown.length();
  if (len > 0) {
    if (unknownOffset >= 0) {
      positionIncrementAtt.setPositionIncrement(0);
    }
    int offset=reader.offset();
    if (matchCell != null) {
      if (matchCell.type == "String_Node_Str") {
        offset-=matchCell.depth;
      }
 else {
        offset-=pending.length();
      }
    }
    if (unknownOffset == -1) {
      termAtt.copyBuffer(unknown.buffer,0,len);
      offsetAtt.setOffset(offset - len,offset);
    }
 else {
      termAtt.copyBuffer(unknown.buffer,unknownOffset,2);
      offset=offset - len + unknownOffset;
      offsetAtt.setOffset(offset,offset + 2);
    }
    unknownOffset++;
    typeAtt.setType("String_Node_Str");
    if (len <= 2 || unknownOffset >= len - 1) {
      unknown.reset();
      unknownOffset=-1;
    }
    return true;
  }
  if (matchCell == null) {
    return false;
  }
  int offset=reader.offset();
  if (cellWordOffset > 0) {
    positionIncrementAtt.setPositionIncrement(0);
  }
  typeAtt.setType(matchCell.type);
  if (matchCell.type != "String_Node_Str") {
    termAtt.copyBuffer(pending.buffer,0,pending.length());
    offsetAtt.setOffset(offset - pending.length(),offset);
    matchCell=null;
    cellWordOffset=0;
  }
 else {
    char[][] words=matchCell.words;
    char[] word=words[cellWordOffset];
    termAtt.copyBuffer(word,0,word.length);
    int start=offset - matchCell.depth + matchCell.offsets[cellWordOffset];
    offsetAtt.setOffset(start,start + word.length);
    cellWordOffset++;
    if (cellWordOffset == words.length) {
      matchCell=null;
      cellWordOffset=0;
    }
  }
  return true;
}