Program: 88422
Project: 88422
Buggy source:
public static RedefinableElement redefineRedefinableElement(final Classifier subClassifier,final RedefinableElement elementToBeRedefined,final boolean createSpecializedType,final List<RedefinableElement> traveled,List<Classifier> visited,boolean isIndividual){
  if (elementToBeRedefined.isLeaf()) {
    Application.getInstance().getGUILog().log(elementToBeRedefined.getQualifiedName() + "String_Node_Str");
  }
  if (!subClassifier.isEditable()) {
    Application.getInstance().getGUILog().log(subClassifier.getQualifiedName() + "String_Node_Str");
    return null;
  }
  RedefinableElement redefinedElement=null;
  for (  NamedElement p : subClassifier.getOwnedMember()) {
    if (p instanceof RedefinableElement && ((RedefinableElement)p).getRedefinedElement().contains(elementToBeRedefined)) {
      redefinedElement=(RedefinableElement)p;
      break;
    }
 else     if (p instanceof RedefinableElement && ((RedefinableElement)p).getRedefinedElement().isEmpty()) {
      if (isMatchingStructuralFeature(p,elementToBeRedefined)) {
        redefinedElement=(RedefinableElement)p;
        redefinedElement.getRedefinedElement().add(elementToBeRedefined);
        break;
      }
 else       if (p instanceof Connector && elementToBeRedefined instanceof Connector) {
        if (((Connector)p).getEnd() != null && ((Connector)elementToBeRedefined).getEnd() != null) {
          if (((Connector)p).getEnd().get(0).getRole() != null && ((Connector)elementToBeRedefined).getEnd().get(0).getRole() != null) {
            if (isMatchingStructuralFeature(((Connector)p).getEnd().get(0).getRole(),(((Connector)elementToBeRedefined).getEnd().get(0).getRole()))) {
              if (((Connector)p).getEnd().size() > 1) {
                if (isMatchingStructuralFeature(((Connector)p).getEnd().get(1).getRole(),(((Connector)elementToBeRedefined).getEnd().get(1).getRole()))) {
                  redefinedElement=(RedefinableElement)p;
                  redefinedElement.getRedefinedElement().add(elementToBeRedefined);
                  break;
                }
              }
            }
          }
        }
 else {
          Application.getInstance().getGUILog().log("String_Node_Str");
        }
      }
    }
  }
  if (redefinedElement == null) {
    redefinedElement=(RedefinableElement)CopyPasting.copyPasteElement(elementToBeRedefined,subClassifier,false);
    redefinedElement.getRedefinedElement().removeAll(elementToBeRedefined.getRedefinedElement());
    redefinedElement.getRedefinedElement().add(elementToBeRedefined);
  }
  if (elementToBeRedefined instanceof Property) {
    if (((Property)elementToBeRedefined).getAssociation() != null) {
      createInheritingAssociation((Property)elementToBeRedefined,subClassifier,(Property)redefinedElement);
    }
  }
  if (createSpecializedType && redefinedElement instanceof Property && ((TypedElement)redefinedElement).getType() != null) {
    CreateSpecializedTypeAction.createSpecializedType((Property)redefinedElement,subClassifier,true,traveled,visited,isIndividual);
  }
  return redefinedElement;
}

Fixed version (ground truth):
public static RedefinableElement redefineRedefinableElement(final Classifier subClassifier,final RedefinableElement elementToBeRedefined,final List<RedefinableElement> traveled,List<Classifier> visited,boolean isIndividual,boolean isRecursive){
  if (elementToBeRedefined.isLeaf()) {
    Application.getInstance().getGUILog().log(elementToBeRedefined.getQualifiedName() + "String_Node_Str");
  }
  if (!subClassifier.isEditable()) {
    Application.getInstance().getGUILog().log(subClassifier.getQualifiedName() + "String_Node_Str");
    return null;
  }
  RedefinableElement redefinedElement=null;
  for (  NamedElement p : subClassifier.getOwnedMember()) {
    if (p instanceof RedefinableElement && SRValidationSuite.doesEventuallyRedefine((RedefinableElement)p,elementToBeRedefined)) {
      redefinedElement=(RedefinableElement)p;
      break;
    }
 else     if (p instanceof RedefinableElement) {
      if (isMatchingTypedElement(p,elementToBeRedefined)) {
        redefinedElement=(RedefinableElement)p;
        redefinedElement.getRedefinedElement().add(elementToBeRedefined);
        break;
      }
 else       if (p instanceof Connector && elementToBeRedefined instanceof Connector) {
        if (((Connector)p).getEnd() != null && ((Connector)elementToBeRedefined).getEnd() != null) {
          if (((Connector)p).getEnd().get(0).getRole() != null && ((Connector)elementToBeRedefined).getEnd().get(0).getRole() != null) {
            if (isMatchingTypedElement(((Connector)p).getEnd().get(0).getRole(),(((Connector)elementToBeRedefined).getEnd().get(0).getRole()))) {
              if (((Connector)p).getEnd().size() > 1) {
                if (isMatchingTypedElement(((Connector)p).getEnd().get(1).getRole(),(((Connector)elementToBeRedefined).getEnd().get(1).getRole()))) {
                  redefinedElement=(RedefinableElement)p;
                  redefinedElement.getRedefinedElement().add(elementToBeRedefined);
                  break;
                }
              }
            }
          }
        }
 else {
          Application.getInstance().getGUILog().log("String_Node_Str");
        }
      }
    }
  }
  if (redefinedElement == null) {
    redefinedElement=(RedefinableElement)CopyPasting.copyPasteElement(elementToBeRedefined,subClassifier,false);
    redefinedElement.getRedefinedElement().removeAll(elementToBeRedefined.getRedefinedElement());
    redefinedElement.getRedefinedElement().add(elementToBeRedefined);
  }
  if (elementToBeRedefined instanceof Property) {
    if (((Property)elementToBeRedefined).getAssociation() != null) {
      createInheritingAssociation((Property)elementToBeRedefined,subClassifier,(Property)redefinedElement);
    }
  }
  if (isRecursive && redefinedElement instanceof Property && ((TypedElement)redefinedElement).getType() != null) {
    CreateSpecializedTypeAction.createSpecializedType((Property)redefinedElement,subClassifier,traveled,visited,isIndividual,isRecursive);
  }
  return redefinedElement;
}