Program: 88401
Project: 88401
Buggy source:
public static final boolean createSpecializedType(final StructuralFeature redefinedAttribute,final Classifier parent,final List<RedefinableElement> traveled,List<Classifier> visited,boolean isIndividual,boolean isRecursive){
  if (!parent.isEditable()) {
    Application.getInstance().getGUILog().log(parent.getQualifiedName() + "String_Node_Str");
    return true;
  }
  if (redefinedAttribute.getType() instanceof Classifier && !(redefinedAttribute.getType() instanceof Property)) {
    boolean hasTraveled=false;
    if (traveled.contains(redefinedAttribute)) {
      hasTraveled=true;
    }
 else {
      for (      final RedefinableElement redefinedProperty : redefinedAttribute.getRedefinedElement()) {
        if (traveled.contains(redefinedProperty)) {
          hasTraveled=true;
          break;
        }
      }
    }
    if (hasTraveled) {
      Application.getInstance().getGUILog().log("String_Node_Str" + redefinedAttribute.getQualifiedName() + "String_Node_Str");
      return false;
    }
    traveled.add(redefinedAttribute);
    for (    final RedefinableElement re : redefinedAttribute.getRedefinedElement()) {
      if (re instanceof RedefinableElement) {
        traveled.add(re);
      }
    }
    final Classifier general=(Classifier)redefinedAttribute.getType();
    Type special=null;
    if (isIndividual || (isRecursive && getExistingSpecial(redefinedAttribute) == null)) {
      SpecializeStructureAction speca=new SpecializeStructureAction(general,false,"String_Node_Str",isRecursive,isIndividual);
      special=speca.createSpecialClassifier(parent,traveled,visited);
    }
 else     if (getExistingSpecial(redefinedAttribute) != null) {
      special=getExistingSpecial(redefinedAttribute);
    }
 else     if (visited.contains(general)) {
      Application.getInstance().getGUILog().log("String_Node_Str" + general.getQualifiedName() + "String_Node_Str"+ redefinedAttribute.getQualifiedName()+ "String_Node_Str");
      return false;
    }
    if (special == null) {
      return true;
    }
    redefinedAttribute.setType(special);
  }
  return true;
}

Fixed version (ground truth):
public static final boolean createSpecializedType(final StructuralFeature redefinedAttribute,final Classifier parent,final List<RedefinableElement> traveled,List<Classifier> visited,boolean isIndividual,boolean isRecursive){
  if (!parent.isEditable()) {
    Application.getInstance().getGUILog().log(parent.getQualifiedName() + "String_Node_Str");
    return true;
  }
  if (redefinedAttribute.getType() instanceof Classifier && !(redefinedAttribute.getType() instanceof Property)) {
    boolean hasTraveled=false;
    if (traveled.contains(redefinedAttribute)) {
      hasTraveled=true;
    }
 else {
      for (      final RedefinableElement redefinedProperty : redefinedAttribute.getRedefinedElement()) {
        if (traveled.contains(redefinedProperty)) {
          hasTraveled=true;
          break;
        }
      }
    }
    if (hasTraveled) {
      Application.getInstance().getGUILog().log("String_Node_Str" + redefinedAttribute.getQualifiedName() + "String_Node_Str");
      return false;
    }
    traveled.add(redefinedAttribute);
    for (    final RedefinableElement re : redefinedAttribute.getRedefinedElement()) {
      if (re instanceof RedefinableElement) {
        traveled.add(re);
      }
    }
    final Classifier general=(Classifier)redefinedAttribute.getType();
    Type special=null;
    if (isIndividual || (isRecursive && getExistingSpecial(redefinedAttribute) == null)) {
      SpecializeStructureAction speca=new SpecializeStructureAction(general,false,"String_Node_Str",isRecursive,isIndividual);
      special=speca.createSpecialClassifier(parent,new ArrayList<>(traveled),visited);
    }
 else     if (getExistingSpecial(redefinedAttribute) != null) {
      special=getExistingSpecial(redefinedAttribute);
    }
 else     if (visited.contains(general)) {
      Application.getInstance().getGUILog().log("String_Node_Str" + general.getQualifiedName() + "String_Node_Str"+ redefinedAttribute.getQualifiedName()+ "String_Node_Str");
      return false;
    }
    if (special == null) {
      return true;
    }
    redefinedAttribute.setType(special);
  }
  return true;
}