Program: 53103
Project: 53103
Buggy source:
private ProcessorBundle prepareProcessors(BuckEventBus buckEventBus,ClassLoader compilerClassLoader,BuildTarget target,List<String> options){
  String processorClassPath=null;
  String processorNames=null;
  Iterator<String> iterator=options.iterator();
  while (iterator.hasNext()) {
    String curr=iterator.next();
    if ("String_Node_Str".equals(curr) && iterator.hasNext()) {
      processorClassPath=iterator.next();
    }
 else     if ("String_Node_Str".equals(curr) && iterator.hasNext()) {
      processorNames=iterator.next();
    }
  }
  ProcessorBundle processorBundle=new ProcessorBundle();
  if (processorClassPath == null || processorNames == null) {
    return processorBundle;
  }
  Iterable<String> rawPaths=Splitter.on(File.pathSeparator).omitEmptyStrings().split(processorClassPath);
  URL[] urls=FluentIterable.from(rawPaths).transform(new Function<String,URL>(){
    @Override public URL apply(    String pathRelativeToProjectRoot){
      try {
        return Paths.get(pathRelativeToProjectRoot).toUri().toURL();
      }
 catch (      MalformedURLException e) {
        throw new RuntimeException(e);
      }
    }
  }
).toArray(URL.class);
  processorBundle.classLoader=new URLClassLoader(urls,compilerClassLoader);
  Iterable<String> names=Splitter.on("String_Node_Str").trimResults().omitEmptyStrings().split(processorNames);
  for (  String name : names) {
    try {
      LOG.debug("String_Node_Str",name);
      Class<? extends Processor> aClass=Preconditions.checkNotNull(processorBundle.classLoader).loadClass(name).asSubclass(Processor.class);
      processorBundle.processors.add(new TracingProcessorWrapper(buckEventBus,target,aClass.newInstance()));
    }
 catch (    ReflectiveOperationException e) {
      throw new HumanReadableException("String_Node_Str",target.getFullyQualifiedName(),name);
    }
  }
  return processorBundle;
}

Fixed version (ground truth):
private ProcessorBundle prepareProcessors(BuckEventBus buckEventBus,ClassLoader compilerClassLoader,ClassLoaderCache classLoaderCache,Set<String> safeAnnotationProcessors,BuildTarget target,List<String> options){
  String processorClassPath=null;
  String processorNames=null;
  Iterator<String> iterator=options.iterator();
  while (iterator.hasNext()) {
    String curr=iterator.next();
    if ("String_Node_Str".equals(curr) && iterator.hasNext()) {
      processorClassPath=iterator.next();
    }
 else     if ("String_Node_Str".equals(curr) && iterator.hasNext()) {
      processorNames=iterator.next();
    }
  }
  if (processorClassPath == null || processorNames == null) {
    return new ProcessorBundle();
  }
  Iterable<String> rawPaths=Splitter.on(File.pathSeparator).omitEmptyStrings().split(processorClassPath);
  URL[] urls=FluentIterable.from(rawPaths).transform(new Function<String,URL>(){
    @Override public URL apply(    String pathRelativeToProjectRoot){
      try {
        return Paths.get(pathRelativeToProjectRoot).toUri().toURL();
      }
 catch (      MalformedURLException e) {
        throw new RuntimeException(e);
      }
    }
  }
).toArray(URL.class);
  List<String> names=Splitter.on("String_Node_Str").trimResults().omitEmptyStrings().splitToList(processorNames);
  ProcessorBundle processorBundle=new ProcessorBundle();
  setProcessorBundleClassLoader(names,urls,compilerClassLoader,classLoaderCache,safeAnnotationProcessors,target,processorBundle);
  for (  String name : names) {
    try {
      LOG.debug("String_Node_Str",name);
      Class<? extends Processor> aClass=Preconditions.checkNotNull(processorBundle.classLoader).loadClass(name).asSubclass(Processor.class);
      processorBundle.processors.add(new TracingProcessorWrapper(buckEventBus,target,aClass.newInstance()));
    }
 catch (    ReflectiveOperationException e) {
      throw new HumanReadableException("String_Node_Str",target.getFullyQualifiedName(),name);
    }
  }
  return processorBundle;
}