Udp C, getting struck in recvfrom

struct sockaddr_in si_minhaTCP,si_minhaUDP, si_outra;
	int nready, maxfdp1;
	int fdTcp;
	int fdUdp;
	fd_set rset;
	if (argc != 4) {
    printf("server {client port(udp)} {admin port(tcp)} {registry file path}\n");
    exit(-1);
  }

    fdTcp = socket(AF_INET, SOCK_STREAM, 0);
    bzero(&si_minhaTCP, sizeof(si_minhaTCP));
    si_minhaTCP.sin_family = AF_INET;
    si_minhaTCP.sin_addr.s_addr = htonl(INADDR_ANY);
    si_minhaTCP.sin_port = htons((short) atoi(argv[2]));
    bind(fdTcp, (struct sockaddr*)&si_minhaTCP, sizeof(si_minhaTCP));
    listen(fdTcp, 10);


		
    fdUdp = socket(AF_INET, SOCK_DGRAM, 0);
	si_minhaUDP.sin_family = AF_INET;
    si_minhaUDP.sin_addr.s_addr = htonl(INADDR_ANY);
    si_minhaUDP.sin_port = htons((short) atoi(argv[1]));
    bind(fdUdp, (struct sockaddr*)&si_minhaUDP, sizeof(si_minhaUDP));


    FD_ZERO(&rset);

    maxfdp1 = max(fdTcp, fdUdp) + 1;
	for (;;)
	{
	  FD_SET(fdTcp, &rset);
      FD_SET(fdUdp, &rset);
      // select the ready descriptor

      nready = select(maxfdp1, &rset, NULL, NULL, NULL);
      if (FD_ISSET(fdTcp, &rset))
      {

          //handle tcp connection
      }
      if (FD_ISSET(fdUdp, &rset))
      {
          pid = fork();

			  if (pid == 0)
			  {

				   while(1)
                   {
                    //username

	 					if((recv_len = recvfrom(fdUdp, username, BUFLEN, 0, (struct sockaddr *) &si_outra, (socklen_t *)&slen)) == -1) {
	 					  erro("Erro recvfrom");
	 					}
	 					username[recv_len]='\0';
	 					//password
	 					if((recv_len = recvfrom(fdUdp, password, BUFLEN, 0, (struct sockaddr *) &si_outra, (socklen_t *)&slen)) == -1) 
                        {

	 					  erro("Erro no recvfrom");
	 					}
	 					password[recv_len]='\0';
	 					printf("Username received: %s\n" , username);
	 					printf("Password received: %s\n" , password);
                         
                        char msg[]="CONFIRMED";

						if(sendto(fdUdp, (const char *)msg, strlen(msg), 0, (struct sockaddr *) &si_outra, slen)==-1)
						{
							erro("Sendto");
						}

                        //here is the problem!!!!!
						char option[BUFLEN];
						if((recv_len = recvfrom(fdUdp, option, BUFLEN, 0, (struct sockaddr *) &si_outra, (socklen_t *)&slen)) == -1) 
                        {
							perror("Error: ");
						}
						option[recv_len]='\0';
						printf("option:%s\n",option);

                        //rest of code
                   }
              }
      }

	}