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 _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss