Hi I was trying to upgrade our mpich version from 3.2.1 to 3.3.2 to consume the latest stable version of mpich, however the new mpich version run get failed. We have 2 parallel environment configuration as below: mt dp pe_name mt slots 2000000 used_slots 1181 bound_slots 0 user_lists NONE xuser_lists NONE start_proc_args /bin/true stop_proc_args /bin/true per_pe_task_prolog NONE per_pe_task_epilog NONE allocation_rule $pe_slots control_slaves FALSE job_is_first_task FALSE urgency_slots min accounting_summary FALSE daemon_forks_slaves FALSE master_forks_slaves TRUE pe_name dp slots 10000 used_slots 0 bound_slots 0 user_lists NONE xuser_lists NONE start_proc_args /bin/true stop_proc_args /bin/true per_pe_task_prolog NONE per_pe_task_epilog NONE allocation_rule $round_robin control_slaves TRUE job_is_first_task FALSE urgency_slots min accounting_summary FALSE daemon_forks_slaves FALSE master_forks_slaves FALSE Running command: We are using qsub to submit workers and master-worker connection will be established using MPI_COMM_ACCEPT and MPI_COMM_CONNECT qsub -P bnormal -pe mt 1 -e sge_err -o sge_out mpiexec -n 1 /path/to/my/binary binary_arguments qsub -P bnormal -pe dp 1 -e sge_err -o sge_out mpiexec -n 1 /path/to/my/binary binary_arguments Running result: mt Dp Mpich 3.2.1 pass Pass Mpich 3.3.2 Fail [proxy:0:0@host1] HYDU_sock_write (utils/sock/sock.c:289): write error ( Bad file descriptor) 2 [proxy:0:0@host1] main (pm/pmiserv/pmip.c:189): unable to send the proxyID to the server Fail error: executing task of job 490150 failed: execution daemon on host "host1" didn't accept task Could you please explain why the run get failed in mpich-3.3 and any solution we can use to get the run pass with mpich-3.3.2? Appreciate any help. Thanks