MPI errors with SGE. Centos7

I have a SGE cluster with a qmaster node and 6 exec hosts. MPI version is Intel(R) MPI Library for Linux. I added 3 nodes to the cluster and since then MPI stopped working. I get the following error when I run a sample script:

 $ cat script.sh
 #!/bin/sh
 # Export all environment variables
 #$ -V
 # Your job name
 #$ -N mpi_hello
 # Use current working directory
 #$ -cwd
 # Join stdout and stderr
 #$ -j y echo "Got $NSLOTS processors." mpirun -np $NSLOTS /home/sge_users/s/mpi_sample_test/mpitest


 $ qsub -pe mpi 4 script.sh
 $ cat mpi_hello.o657 
 Got 6 processors.

 ==================================================================================
 =   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
 =   PID 27863 RUNNING AT marcher7
 =   EXIT CODE: 153
 =   CLEANING UP REMAINING PROCESSES
 =   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES

 =   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
 =   PID 27863 RUNNING AT marcher7
 =   EXIT CODE: 25
 =   CLEANING UP REMAINING PROCESSES
 =   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
 ==================================================================================

Although when I run the mpirun command without SGE it works just fine. I've restarted the SGE, checked SGE logs and /var/log/messages, and googled the error but didn't find the problem. Is there a way to interpret those exit codes? Thanks