Program: 149399
Project: 149399
Buggy source:
@Override public boolean shouldSchedule(Queue.Task p,List<Action> actions){
  if (p instanceof AbstractProject && p instanceof BuildableItemWithBuildWrappers) {
    AbstractProject project=(AbstractProject)p;
    InstanceCreator instanceCreator=null;
    boolean singleUse=false;
    for (    Object buildWrapper : ((BuildableItemWithBuildWrappers)p).getBuildWrappersList().toMap().values()) {
      if (buildWrapper instanceof InstanceCreator) {
        instanceCreator=(InstanceCreator)buildWrapper;
      }
 else       if (buildWrapper instanceof SingleUseSlaveBuildOption) {
        singleUse=true;
      }
      if (instanceCreator != null && singleUse) {
        break;
      }
    }
    if (instanceCreator != null) {
      for (      Queue.Item item : Queue.getInstance().getItems(p)) {
        boolean shouldScheduleItem=false;
        for (        Queue.QueueAction action : item.getActions(Queue.QueueAction.class)) {
          shouldScheduleItem|=action.shouldSchedule(actions);
        }
        for (        Queue.QueueAction action : Util.filter(actions,Queue.QueueAction.class)) {
          shouldScheduleItem|=action.shouldSchedule(item.getActions());
        }
        if (!shouldScheduleItem) {
          return false;
        }
      }
      LabelAtom label=ElasticBoxLabelFinder.getLabel(instanceCreator.getProfile(),instanceCreator.getBoxVersion(),singleUse);
      if (singleUse) {
        try {
          ElasticBoxSlave slave=new ElasticBoxSlave(instanceCreator.getProfile(),instanceCreator.getBoxVersion(),singleUse,(ElasticBoxCloud)Jenkins.getInstance().getCloud(instanceCreator.getCloud()));
          slave.setInUse(true);
          Jenkins.getInstance().addNode(slave);
          ElasticBoxSlaveHandler.submit(slave);
        }
 catch (        Descriptor.FormException ex) {
          LOGGER.log(Level.SEVERE,ex.getMessage(),ex);
        }
catch (        IOException ex) {
          LOGGER.log(Level.SEVERE,ex.getMessage(),ex);
        }
      }
      try {
        project.setAssignedLabel(label);
      }
 catch (      IOException ex) {
        LOGGER.log(Level.SEVERE,ex.getMessage(),ex);
      }
    }
  }
  return true;
}

Fixed version (ground truth):
@Override public boolean shouldSchedule(Queue.Task p,List<Action> actions){
  if (p instanceof AbstractProject && p instanceof BuildableItemWithBuildWrappers) {
    AbstractProject project=(AbstractProject)p;
    InstanceCreator instanceCreator=null;
    boolean singleUse=false;
    for (    Object buildWrapper : ((BuildableItemWithBuildWrappers)p).getBuildWrappersList().toMap().values()) {
      if (buildWrapper instanceof InstanceCreator) {
        instanceCreator=(InstanceCreator)buildWrapper;
      }
 else       if (buildWrapper instanceof SingleUseSlaveBuildOption) {
        singleUse=true;
      }
      if (instanceCreator != null && singleUse) {
        break;
      }
    }
    if (instanceCreator != null) {
      for (      Queue.Item item : Queue.getInstance().getItems(p)) {
        boolean shouldScheduleItem=false;
        for (        Queue.QueueAction action : item.getActions(Queue.QueueAction.class)) {
          shouldScheduleItem|=action.shouldSchedule(actions);
        }
        for (        Queue.QueueAction action : Util.filter(actions,Queue.QueueAction.class)) {
          shouldScheduleItem|=action.shouldSchedule(item.getActions());
        }
        if (!shouldScheduleItem) {
          return false;
        }
      }
      LabelAtom label=ElasticBoxLabelFinder.getLabel(instanceCreator.getProfile(),instanceCreator.getBoxVersion(),singleUse);
      if (singleUse) {
        try {
          ElasticBoxSlave slave=new ElasticBoxSlave(instanceCreator.getProfile(),instanceCreator.getBoxVersion(),singleUse,(ElasticBoxCloud)Jenkins.getInstance().getCloud(instanceCreator.getCloud()));
          Jenkins.getInstance().addNode(slave);
          ElasticBoxSlaveHandler.submit(slave);
        }
 catch (        Descriptor.FormException ex) {
          LOGGER.log(Level.SEVERE,ex.getMessage(),ex);
        }
catch (        IOException ex) {
          LOGGER.log(Level.SEVERE,ex.getMessage(),ex);
        }
      }
      try {
        project.setAssignedLabel(label);
      }
 catch (      IOException ex) {
        LOGGER.log(Level.SEVERE,ex.getMessage(),ex);
      }
    }
  }
  return true;
}