[mpich-discuss] Waitany for Ibarrier and Irecv in sequential program

[Nils-Arne Dreier]

Dear MPICH community,

the following program deadlocks when executed with MPICH 3.2 (Debian
stretch) on a single rank.


barrier_waitany.cc
#include <mpi.h>

int main(int argc, char** argv){
  MPI_Request req[2];
  int buf;
  int index;
  MPI_Init(&argc, &argv);
  MPI_Ibarrier(MPI_COMM_WORLD, &req[0]);
  MPI_Irecv(&buf, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, &req[1]);
  MPI_Waitany(2, req, &index, MPI_STATUS_IGNORE);
  MPI_Finalize();
  return 0;
}

Compile with:
mpic++ -g -std=c++14 -Wall mpi_barrier_waitany.cc -o mpi_barrier_waitany

Execute with:
mpirun -n 1 ./barrier_waitany

Best,
Nils


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