Program: 74992
Project: 74992
Buggy source:
/** 
 * If there are available resources, then perform a conditional branch on any <i>release</i> input or <i>grant</i> output. If the selected branch is a release input, then add the provided token to the end of the resource pool. If it is a grant output, then remove the first element from the resource pool and send it to the output. If there are no available resources, then perform a conditional branch only on the release inputs.
 * @exception IllegalActionException If an error occurs duringexecuting the process.
 * @exception TerminateProcessException If the process terminationis requested by the director.
 */
public void fire() throws IllegalActionException {
  super.fire();
  if (_debugging && _VERBOSE_DEBUGGING && !_listeningToBranchController) {
    _branchController.addDebugListener(this);
    _listeningToBranchController=true;
  }
 else {
    _branchController.removeDebugListener(this);
    _listeningToBranchController=false;
  }
  ConditionalBranch[] branches=new ConditionalBranch[input.getWidth()];
  for (int i=0; i < input.getWidth(); i++) {
    branches[i]=new ConditionalReceive(input,i,i);
    if (_debugging && _VERBOSE_DEBUGGING) {
      branches[i].addDebugListener(this);
    }
  }
  if (_debugging) {
    _debug("String_Node_Str");
  }
  if (!executeBranches(branches)) {
    if (_debugging) {
      _debug("String_Node_Str");
    }
    return;
  }
  if (_debugging) {
    _debug("String_Node_Str");
    if (_VERBOSE_DEBUGGING) {
      for (int i=0; i < branches.length; i++) {
        branches[i].removeDebugListener(this);
      }
    }
  }
  Token[] data=new Token[input.getWidth()];
  for (int i=0; i < input.getWidth(); i++) {
    data[i]=branches[i].getToken();
    if (_debugging) {
      _debug("String_Node_Str" + i + "String_Node_Str"+ data[i]);
    }
    if (data[i] == null) {
      throw new InternalErrorException("String_Node_Str");
    }
  }
  if (output.getWidth() > 0) {
    branches=new ConditionalBranch[output.getWidth()];
    Token token=new Token();
    for (int i=0; i < output.getWidth(); i++) {
      if (i < input.getWidth()) {
        token=data[i];
      }
      if (_debugging) {
        _debug("String_Node_Str" + i + "String_Node_Str"+ token);
      }
      branches[i]=new ConditionalSend(output,i,i,token);
      if (_debugging && _VERBOSE_DEBUGGING) {
        branches[i].addDebugListener(this);
      }
    }
    if (_debugging) {
      _debug("String_Node_Str");
    }
    if (executeBranches(branches)) {
      if (_debugging) {
        _debug("String_Node_Str");
      }
    }
 else {
      if (_debugging) {
        _debug("String_Node_Str");
      }
    }
    if (_debugging && _VERBOSE_DEBUGGING) {
      for (int i=0; i < branches.length; i++) {
        branches[i].removeDebugListener(this);
      }
    }
  }
}

Fixed version (ground truth):
/** 
 * Perform a multiway rendezvous with all input channels, collect one input token from each channel, and then perform a multiway rendezvous with the output channels, providing that data.
 * @exception IllegalActionException If the input width is zero.
 * @exception TerminateProcessException If the process terminationis requested by the director.
 */
public void fire() throws IllegalActionException {
  super.fire();
  if (_debugging && _VERBOSE_DEBUGGING && !_listeningToBranchController) {
    _branchController.addDebugListener(this);
    _listeningToBranchController=true;
  }
 else {
    _branchController.removeDebugListener(this);
    _listeningToBranchController=false;
  }
  if (input.getWidth() == 0) {
    throw new IllegalActionException(this,"String_Node_Str");
  }
  ConditionalBranch[] branches=new ConditionalBranch[input.getWidth()];
  for (int i=0; i < input.getWidth(); i++) {
    branches[i]=new ConditionalReceive(input,i,i);
    if (_debugging && _VERBOSE_DEBUGGING) {
      branches[i].addDebugListener(this);
    }
  }
  if (_debugging) {
    _debug("String_Node_Str");
  }
  if (!_branchController.executeBranches(branches)) {
    if (_debugging) {
      _debug("String_Node_Str");
    }
    return;
  }
  if (_debugging) {
    _debug("String_Node_Str");
    if (_VERBOSE_DEBUGGING) {
      for (int i=0; i < branches.length; i++) {
        branches[i].removeDebugListener(this);
      }
    }
  }
  Token[] data=new Token[input.getWidth()];
  for (int i=0; i < input.getWidth(); i++) {
    data[i]=branches[i].getToken();
    if (_debugging) {
      _debug("String_Node_Str" + i + "String_Node_Str"+ data[i]);
    }
    if (data[i] == null) {
      throw new InternalErrorException("String_Node_Str");
    }
  }
  if (output.getWidth() > 0) {
    branches=new ConditionalBranch[output.getWidth()];
    Token token=null;
    for (int i=0; i < output.getWidth(); i++) {
      if (i < input.getWidth()) {
        token=data[i];
      }
      if (_debugging) {
        _debug("String_Node_Str" + i + "String_Node_Str"+ token);
      }
      branches[i]=new ConditionalSend(output,i,i,token);
      if (_debugging && _VERBOSE_DEBUGGING) {
        branches[i].addDebugListener(this);
      }
    }
    if (_debugging) {
      _debug("String_Node_Str");
    }
    if (_branchController.executeBranches(branches)) {
      if (_debugging) {
        _debug("String_Node_Str");
      }
    }
 else {
      if (_debugging) {
        _debug("String_Node_Str");
      }
    }
    if (_debugging && _VERBOSE_DEBUGGING) {
      for (int i=0; i < branches.length; i++) {
        branches[i].removeDebugListener(this);
      }
    }
  }
}