Program: 153243
Project: 153243
Buggy source:
public static Socket openSocket(String hostname,int port,PassthroughConnection ptc){
  Socket socket=null;
  try {
    if (hostname.trim().startsWith("String_Node_Str") && Globals.varyLocalhost()) {
      String fakeLocalIP=LocalhostIPFactory.getNextIP();
      if (!Globals.isQuiet()) {
        ptc.printLogMessage("String_Node_Str" + hostname + "String_Node_Str"+ port+ "String_Node_Str"+ fakeLocalIP);
      }
      socket=new Socket(hostname,port,InetAddress.getByName(fakeLocalIP),0);
    }
 else {
      socket=new Socket(hostname,port);
    }
  }
 catch (  UnknownHostException e) {
    ptc.printLogMessage("String_Node_Str" + hostname);
    return null;
  }
catch (  IOException e) {
    if (hostname.trim().startsWith("String_Node_Str")) {
      List<String> hostnames=getLocalIPs();
      for (      String h : hostnames) {
        try {
          socket=new Socket(h,port);
        }
 catch (        IOException ioe) {
          continue;
        }
        ptc.printLogMessage("String_Node_Str" + h);
        break;
      }
    }
    if (socket == null) {
      ptc.printLogMessage("String_Node_Str" + hostname + "String_Node_Str"+ port);
      return null;
    }
  }
  try {
    socket.setSoTimeout(1000);
  }
 catch (  SocketException e) {
    ptc.printLogMessage("String_Node_Str");
    if (socket != null) {
      try {
        socket.close();
      }
 catch (      IOException ioe) {
        return null;
      }
    }
    return null;
  }
  return socket;
}

Fixed version (ground truth):
public static Socket openSocket(String hostname,int port,PassthroughConnection ptc){
  Socket socket=null;
  try {
    if (hostname.trim().startsWith("String_Node_Str") && Globals.varyLocalhost()) {
      String fakeLocalIP=LocalhostIPFactory.getNextIP();
      if (!Globals.isQuiet()) {
        ptc.printLogMessage("String_Node_Str" + hostname + "String_Node_Str"+ port+ "String_Node_Str"+ fakeLocalIP);
      }
      socket=new Socket(hostname,port,InetAddress.getByName(fakeLocalIP),0);
    }
 else {
      socket=new Socket(hostname,port);
    }
  }
 catch (  UnknownHostException e) {
    ptc.printLogMessage("String_Node_Str" + hostname);
    return null;
  }
catch (  IOException e) {
    if (hostname.trim().startsWith("String_Node_Str")) {
      List<String> hostnames=getLocalIPs();
      for (      String h : hostnames) {
        try {
          socket=new Socket(h,port);
        }
 catch (        IOException ioe) {
          continue;
        }
        ptc.printLogMessage("String_Node_Str" + h);
        ptc.printLogMessage("String_Node_Str" + h);
        ptc.printLogMessage("String_Node_Str" + h);
        ptc.printLogMessage("String_Node_Str" + h);
        ptc.printLogMessage("String_Node_Str" + h);
        ptc.printLogMessage("String_Node_Str" + h);
        ptc.printLogMessage("String_Node_Str");
        break;
      }
    }
    if (socket == null) {
      ptc.printLogMessage("String_Node_Str" + hostname + "String_Node_Str"+ port);
      return null;
    }
  }
  try {
    socket.setSoTimeout(1000);
  }
 catch (  SocketException e) {
    ptc.printLogMessage("String_Node_Str");
    if (socket != null) {
      try {
        socket.close();
      }
 catch (      IOException ioe) {
        return null;
      }
    }
    return null;
  }
  return socket;
}