[Openmp-dev] Debug assert trigger in OpenMP + MPI

[Raúl Peñacoba Veigas via Openmp-dev]

Hello everyone,

Writing an OpenMP + MPI code I've triggered a debug assert in 
__kmp_task_start:

KMP_DEBUG_ASSERT(taskdata->td_flags.tasktype == TASK_EXPLICIT);

I attach a simpler code that does not do anything special with 
additional info.

#include <mpi.h>

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main(int argc, char **argv)
{
         int TIMESTEPS = 10;
         int BLOCKS = 100;

         MPI_Init(&argc, &argv);

         int rank, nranks;
         MPI_Comm_rank(MPI_COMM_WORLD, &rank);
         MPI_Comm_size(MPI_COMM_WORLD, &nranks);

         int DATA;

         #pragma omp parallel
         #pragma omp single
         {
                 for (int t = 0; t < TIMESTEPS; ++t) {
                         for (int r = 0; r < nranks; ++r) {
                                 for (int b = 0; b < BLOCKS; ++b) {
                                         #pragma omp task depend(in: DATA)
                                         { }
                                 }
                         }

                         #pragma omp task depend(inout: DATA)
                         {}
                 }
                 #pragma omp taskwait
         }

         MPI_Finalize();

}

llvm_project debug build, commitaafdeeade8d
MPICH Version: 3.3a2
MPICH Release date: Sun Nov 13 09:12:11 MST 2016

$ MPICH_CC=clang mpicc -fopenmp t1.c -o t1
$ for i in {1..100}; do mpiexec.hydra -n 4 ./t1; done



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