Program: 63703
Project: 63703
Buggy source:
@Override public boolean doWork(){
  if (targets == null) {
    Vect targetStart=new Vect(xCoord,yCoord,zCoord);
    int sizeNorthSouth=FarmHelper.getFarmSizeNorthSouth(worldObj,targetStart);
    int sizeEastWest=FarmHelper.getFarmSizeEastWest(worldObj,targetStart);
    allowedExtent=Math.max(sizeNorthSouth,sizeEastWest) * 3;
    targets=createTargets(worldObj,targetStart,allowedExtent,sizeNorthSouth,sizeEastWest);
    setExtents();
  }
 else   if (checkTimer.delayPassed(worldObj,400)) {
    setExtents();
  }
  if (tryAddPending()) {
    return true;
  }
  if (!pendingProduce.isEmpty()) {
    setErrorState(EnumErrorCode.NOSPACE);
    return false;
  }
  if (storedFertilizer <= BUFFER_FERTILIZER) {
    replenishFertilizer();
    if (storedFertilizer <= 0) {
      setErrorState(EnumErrorCode.NOFERTILIZER);
      return false;
    }
  }
  if (!pendingCrops.isEmpty()) {
    if (cullCrop(pendingCrops.peek(),harvestProvider)) {
      pendingCrops.pop();
      return true;
    }
 else {
      return false;
    }
  }
  boolean didWork=false;
  for (  Map.Entry<ForgeDirection,List<FarmTarget>> entry : targets.entrySet()) {
    ForgeDirection farmSide=entry.getKey();
    IFarmLogic logic=getFarmLogic(farmSide);
    if (logic == null) {
      continue;
    }
    if (isCycleCanceledByListeners(logic,farmSide)) {
      continue;
    }
    if (collectWindfall(logic)) {
      didWork=true;
    }
 else {
      List<FarmTarget> farmTargets=entry.getValue();
      if (stage == Stage.HARVEST) {
        didWork=harvestTargets(farmTargets,logic);
      }
 else {
        didWork=cultivateTargets(farmTargets,logic);
      }
    }
    if (didWork) {
      break;
    }
  }
  stage=stage.next();
  return didWork;
}

Fixed version (ground truth):
@Override public boolean doWork(){
  if (targets == null) {
    Vect targetStart=new Vect(xCoord,yCoord,zCoord);
    int sizeNorthSouth=FarmHelper.getFarmSizeNorthSouth(worldObj,targetStart);
    int sizeEastWest=FarmHelper.getFarmSizeEastWest(worldObj,targetStart);
    allowedExtent=Math.max(sizeNorthSouth,sizeEastWest) * 3;
    targets=createTargets(worldObj,targetStart,allowedExtent,sizeNorthSouth,sizeEastWest);
    setExtents();
  }
 else   if (checkTimer.delayPassed(worldObj,400)) {
    setExtents();
  }
  if (tryAddPending()) {
    return true;
  }
  if (!pendingProduce.isEmpty()) {
    setErrorState(EnumErrorCode.NOSPACE);
    return false;
  }
  if (storedFertilizer <= BUFFER_FERTILIZER) {
    replenishFertilizer();
    if (storedFertilizer <= 0) {
      setErrorState(EnumErrorCode.NOFERTILIZER);
      return false;
    }
  }
  if (!pendingCrops.isEmpty()) {
    if (cullCrop(pendingCrops.peek(),harvestProvider)) {
      pendingCrops.pop();
      return true;
    }
 else {
      return false;
    }
  }
  FarmWorkStatus farmWorkStatus=new FarmWorkStatus();
  for (  Map.Entry<ForgeDirection,List<FarmTarget>> entry : targets.entrySet()) {
    ForgeDirection farmSide=entry.getKey();
    IFarmLogic logic=getFarmLogic(farmSide);
    if (logic == null) {
      continue;
    }
    if (isCycleCanceledByListeners(logic,farmSide)) {
      continue;
    }
    if (collectWindfall(logic)) {
      farmWorkStatus.didWork=true;
    }
 else {
      List<FarmTarget> farmTargets=entry.getValue();
      if (stage == Stage.HARVEST) {
        farmWorkStatus.didWork=harvestTargets(farmTargets,logic);
      }
 else {
        farmWorkStatus=cultivateTargets(farmWorkStatus,farmTargets,logic);
      }
    }
    if (farmWorkStatus.didWork) {
      break;
    }
  }
  if (farmWorkStatus.didWork) {
    setErrorState(EnumErrorCode.OK);
  }
 else   if (stage == Stage.CULTIVATE) {
    if (!farmWorkStatus.hasFarmland) {
      setErrorState(EnumErrorCode.NOFARMLAND);
    }
 else     if (!farmWorkStatus.hasFertilizer) {
      setErrorState(EnumErrorCode.NOFERTILIZER);
    }
 else     if (!farmWorkStatus.hasLiquid) {
      setErrorState(EnumErrorCode.NOLIQUID);
    }
  }
  stage=stage.next();
  return farmWorkStatus.didWork;
}