Program: 116533
Project: 116533
Buggy source:
@Override public String attachVolume(String instanceId,String volumeId,String deviceName){
  IaasProvider iaasInfo=getIaasProvider();
  if (StringUtils.isEmpty(volumeId)) {
    log.error("String_Node_Str");
  }
  if (StringUtils.isEmpty(instanceId)) {
    log.error("String_Node_Str");
  }
  ComputeServiceContext context=iaasInfo.getComputeService().getContext();
  String region=ComputeServiceBuilderUtil.extractRegion(iaasInfo);
  String device=deviceName == null ? "String_Node_Str" : deviceName;
  if (region == null) {
    log.fatal(String.format("String_Node_Str",volumeId,region,iaasInfo));
    return null;
  }
  NovaApi novaApi=context.unwrapApi(NovaApi.class);
  VolumeApi volumeApi=novaApi.getVolumeExtensionForZone(region).get();
  VolumeAttachmentApi volumeAttachmentApi=novaApi.getVolumeAttachmentExtensionForZone(region).get();
  Volume.Status volumeStatus=this.getVolumeStatus(volumeApi,volumeId);
  if (log.isDebugEnabled()) {
    log.debug("String_Node_Str" + volumeId + "String_Node_Str"+ volumeStatus);
  }
  if (!(volumeStatus == Volume.Status.AVAILABLE || volumeStatus == Volume.Status.CREATING)) {
    log.error(String.format("String_Node_Str",volumeId,volumeStatus));
    return null;
  }
  boolean volumeBecameAvailable=false, volumeBecameAttached=false;
  try {
    volumeBecameAvailable=waitForStatus(volumeId,Volume.Status.AVAILABLE,5);
  }
 catch (  TimeoutException e) {
    log.error("String_Node_Str" + volumeId + "String_Node_Str");
  }
  VolumeAttachment attachment=null;
  if (volumeBecameAvailable) {
    attachment=volumeAttachmentApi.attachVolumeToServerAsDevice(volumeId,instanceId,device);
    try {
      volumeBecameAttached=waitForStatus(volumeId,Volume.Status.IN_USE,2);
    }
 catch (    TimeoutException e) {
      log.error("String_Node_Str" + volumeId + "String_Node_Str");
    }
  }
  try {
    Thread.sleep(5000);
  }
 catch (  InterruptedException e) {
    e.printStackTrace();
  }
  if (attachment == null) {
    log.fatal(String.format("String_Node_Str",volumeId,instanceId,region,iaasInfo));
    return null;
  }
  if (!volumeBecameAttached) {
    log.error(String.format("String_Node_Str",volumeId));
  }
  log.info(String.format("String_Node_Str",volumeId,instanceId,region,iaasInfo));
  return "String_Node_Str";
}

Fixed version (ground truth):
@Override public String attachVolume(String instanceId,String volumeId,String deviceName){
  IaasProvider iaasInfo=getIaasProvider();
  if (StringUtils.isEmpty(volumeId)) {
    log.error("String_Node_Str");
  }
  if (StringUtils.isEmpty(instanceId)) {
    log.error("String_Node_Str");
  }
  ComputeServiceContext context=iaasInfo.getComputeService().getContext();
  String region=ComputeServiceBuilderUtil.extractRegion(iaasInfo);
  String device=deviceName == null ? "String_Node_Str" : deviceName;
  if (region == null) {
    log.fatal(String.format("String_Node_Str",volumeId,iaasInfo));
    return null;
  }
  NovaApi novaApi=context.unwrapApi(NovaApi.class);
  VolumeApi volumeApi=novaApi.getVolumeExtensionForZone(region).get();
  VolumeAttachmentApi volumeAttachmentApi=novaApi.getVolumeAttachmentExtensionForZone(region).get();
  Volume.Status volumeStatus=this.getVolumeStatus(volumeApi,volumeId);
  if (log.isDebugEnabled()) {
    log.debug("String_Node_Str" + volumeId + "String_Node_Str"+ volumeStatus);
  }
  if (!(volumeStatus == Volume.Status.AVAILABLE || volumeStatus == Volume.Status.CREATING)) {
    log.error(String.format("String_Node_Str",volumeId,volumeStatus));
    return null;
  }
  boolean volumeBecameAvailable=false, volumeBecameAttached=false;
  try {
    volumeBecameAvailable=waitForStatus(volumeId,Volume.Status.AVAILABLE,5);
  }
 catch (  TimeoutException e) {
    log.error("String_Node_Str" + volumeId + "String_Node_Str");
  }
  VolumeAttachment attachment=null;
  if (volumeBecameAvailable) {
    attachment=volumeAttachmentApi.attachVolumeToServerAsDevice(volumeId,instanceId,device);
    try {
      volumeBecameAttached=waitForStatus(volumeId,Volume.Status.IN_USE,2);
    }
 catch (    TimeoutException e) {
      log.error("String_Node_Str" + volumeId + "String_Node_Str");
    }
  }
  try {
    Thread.sleep(5000);
  }
 catch (  InterruptedException e) {
    e.printStackTrace();
  }
  if (attachment == null) {
    log.fatal(String.format("String_Node_Str",volumeId,instanceId,region,iaasInfo));
    return null;
  }
  if (!volumeBecameAttached) {
    log.error(String.format("String_Node_Str",volumeId));
  }
  log.info(String.format("String_Node_Str",volumeId,instanceId,region,iaasInfo));
  return "String_Node_Str";
}