Program: 110683
Project: 110683
Buggy source:
private static String suffix(ActionAnalysisMetadata a,ActionAnalysisMetadata b){
  StringBuilder sb=new StringBuilder();
  ActionOwner aOwner=a.getOwner();
  ActionOwner bOwner=b.getOwner();
  boolean aNull=aOwner == null;
  boolean bNull=bOwner == null;
  addStringDetail(sb,"String_Node_Str",aNull ? null : Label.print(aOwner.getLabel()),bNull ? null : Label.print(bOwner.getLabel()));
  addStringDetail(sb,"String_Node_Str",aNull ? null : aOwner.getTargetKind(),bNull ? null : bOwner.getTargetKind());
  addStringDetail(sb,"String_Node_Str",aNull ? null : aOwner.getConfigurationChecksum(),bNull ? null : bOwner.getConfigurationChecksum());
  addStringDetail(sb,"String_Node_Str",a.getMnemonic(),b.getMnemonic());
  addStringDetail(sb,"String_Node_Str",getKey(a),getKey(b));
  if ((a instanceof ActionExecutionMetadata) && (b instanceof ActionExecutionMetadata)) {
    addStringDetail(sb,"String_Node_Str",((ActionExecutionMetadata)a).getProgressMessage(),((ActionExecutionMetadata)b).getProgressMessage());
  }
  Artifact aPrimaryInput=a.getPrimaryInput();
  Artifact bPrimaryInput=b.getPrimaryInput();
  addStringDetail(sb,"String_Node_Str",aPrimaryInput == null ? null : aPrimaryInput.toString(),bPrimaryInput == null ? null : bPrimaryInput.toString());
  addStringDetail(sb,"String_Node_Str",a.getPrimaryOutput().toString(),b.getPrimaryOutput().toString());
  if ((aPrimaryInput == null && bPrimaryInput == null) || (aPrimaryInput != null && bPrimaryInput != null && aPrimaryInput.toString().equals(bPrimaryInput.toString()))) {
    Artifact aPrimaryOutput=a.getPrimaryOutput();
    Artifact bPrimaryOutput=b.getPrimaryOutput();
    if (aPrimaryOutput != bPrimaryOutput) {
      sb.append("String_Node_Str").append(System.identityHashCode(aPrimaryOutput)).append("String_Node_Str").append(System.identityHashCode(bPrimaryOutput)).append('\n');
    }
    ArtifactOwner aArtifactOwner=aPrimaryOutput.getArtifactOwner();
    ArtifactOwner bArtifactOwner=bPrimaryOutput.getArtifactOwner();
    addStringDetail(sb,"String_Node_Str",aArtifactOwner.toString(),bArtifactOwner.toString());
    addListDetail(sb,"String_Node_Str",a.getMandatoryInputs(),b.getMandatoryInputs());
    addListDetail(sb,"String_Node_Str",a.getOutputs(),b.getOutputs());
  }
  return sb.toString();
}

Fixed version (ground truth):
private static String suffix(ActionAnalysisMetadata a,ActionAnalysisMetadata b){
  StringBuilder sb=new StringBuilder();
  ActionOwner aOwner=a.getOwner();
  ActionOwner bOwner=b.getOwner();
  boolean aNull=aOwner == null;
  boolean bNull=bOwner == null;
  addStringDetail(sb,"String_Node_Str",aNull ? null : Label.print(aOwner.getLabel()),bNull ? null : Label.print(bOwner.getLabel()));
  addStringDetail(sb,"String_Node_Str",aNull ? null : aOwner.getTargetKind(),bNull ? null : bOwner.getTargetKind());
  addStringDetail(sb,"String_Node_Str",aNull ? null : aOwner.getConfigurationChecksum(),bNull ? null : bOwner.getConfigurationChecksum());
  addStringDetail(sb,"String_Node_Str",a.getMnemonic(),b.getMnemonic());
  addStringDetail(sb,"String_Node_Str",getKey(a),getKey(b));
  if ((a instanceof ActionExecutionMetadata) && (b instanceof ActionExecutionMetadata)) {
    addStringDetail(sb,"String_Node_Str",((ActionExecutionMetadata)a).getProgressMessage(),((ActionExecutionMetadata)b).getProgressMessage());
  }
  Artifact aPrimaryInput=a.getPrimaryInput();
  Artifact bPrimaryInput=b.getPrimaryInput();
  addStringDetail(sb,"String_Node_Str",aPrimaryInput == null ? null : aPrimaryInput.toString(),bPrimaryInput == null ? null : bPrimaryInput.toString());
  addStringDetail(sb,"String_Node_Str",a.getPrimaryOutput().toString(),b.getPrimaryOutput().toString());
  if ((aPrimaryInput == null && bPrimaryInput == null) || (aPrimaryInput != null && bPrimaryInput != null && aPrimaryInput.toString().equals(bPrimaryInput.toString()))) {
    Artifact aPrimaryOutput=a.getPrimaryOutput();
    Artifact bPrimaryOutput=b.getPrimaryOutput();
    if (!aPrimaryOutput.equals(bPrimaryOutput)) {
      sb.append("String_Node_Str").append(System.identityHashCode(aPrimaryOutput)).append("String_Node_Str").append(System.identityHashCode(bPrimaryOutput)).append('\n');
    }
    ArtifactOwner aArtifactOwner=aPrimaryOutput.getArtifactOwner();
    ArtifactOwner bArtifactOwner=bPrimaryOutput.getArtifactOwner();
    addStringDetail(sb,"String_Node_Str",aArtifactOwner.toString(),bArtifactOwner.toString());
    addListDetail(sb,"String_Node_Str",a.getMandatoryInputs(),b.getMandatoryInputs());
    addListDetail(sb,"String_Node_Str",a.getOutputs(),b.getOutputs());
  }
  return sb.toString();
}