[mpich-discuss] MPIR_Request_complete(232): INTERNAL ERROR: unexpected value in case statement

[Jeff Hammond]

I am trying to run the following program.  It's obviously a silly
program but I wrote it to make an argument about the MPI standard.  I
don't believe it violates the MPI standard, but please let me know if
I am mistaken.

smakramu-mobl:MPI jrhammon$ cat wait-race.c
#include <stdio.h>
#include <omp.h>
#include <mpi.h>

int main(int argc, char * argv[])
{
    int provided;
    MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &provided);
    if (provided<MPI_THREAD_MULTIPLE) {
        printf("inadequate thread support\n");
        MPI_Finalize();
    }

    MPI_Request req;
    MPI_Ibarrier(MPI_COMM_WORLD, &req);
    //req = MPI_REQUEST_NULL;
#pragma omp parallel num_threads(2) shared(req)
    {
        MPI_Wait(&req, MPI_STATUS_IGNORE);
    }

    printf("test finished\n");
    MPI_Finalize();
    return 0;
}

I compile the program with MPICH git master and GCC 4.9.2 from about a week ago:

smakramu-mobl:MPI jrhammon$ mpicc -fopenmp -g -Wall wait-race.c

smakramu-mobl:MPI jrhammon$ mpichversion
MPICH Version:    	3.2a2
MPICH Release date:	unreleased development copy
MPICH Device:    	ch3:nemesis
MPICH configure: 	CC=gcc-4.9 CXX=g++-4.9 FC=gfortran-4.9
F77=gfortran-4.9 --disable-cxx --enable-fortran
--enable-threads=runtime --enable-g=dbg --with-pm=hydra
--prefix=/opt/mpich/dev/gcc/default --enable-wrapper-rpath
--enable-static --enable-shared
MPICH CC: 	gcc-4.9    -g -O2
MPICH CXX: 	no   -g
MPICH F77: 	gfortran-4.9   -g -O2
MPICH FC: 	gfortran-4.9   -g -O2

Sometimes the program runs fine:

smakramu-mobl:MPI jrhammon$ mpiexec -n 2 ./a.out
test finished
test finished

And sometimes it fails like this:

smakramu-mobl:MPI jrhammon$ mpiexec -n 2 ./a.out
test finished
Fatal error in MPI_Wait: Internal MPI error!, error stack:
MPI_Wait(187).............: MPI_Wait(request=0x7fff5b51ee88, status=0x1) failed
MPIR_Wait_impl(84)........:
MPIR_Request_complete(232): INTERNAL ERROR: unexpected value in case
statement (value=78309520)

So either my program violates the MPI standard or there's a bug in
MPICH.  Please let me know which it is.

Thanks,

Jeff

-- 
Jeff Hammond
jeff.science at gmail.com
http://jeffhammond.github.io/
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