[mpich-discuss] Segfault in MPI_Comm_split on OS X (MPICH 3.2)

[Eric A. Borisch]

This might be the alignment bug.
http://lists.mpich.org/pipermail/discuss/2016-May/004764.html

You can try the trivial patch yourself to find out. It was already
addressed in head; there were comments that a patched version might be
cut...

- Eric

On Fri, Aug 19, 2016 at 11:43 AM, Dmitriy Morozov <dmitriy at mrzv.org> wrote:
> When I compile and run the following code on my mac (running OS X
> 10.11.6, El Capitan), with MPICH 3.2 built from source (via Homebrew),
> I get a segfault in MPI_Comm_split. If I do the same with a recent
> clone from the git repository (specifically, d8bb1df), everything
> works fine. I'm wondering if this is a known problem in 3.2.
>
> Thanks.
> Dmitriy
>
> // test-mpi.c
>
> #include <mpi.h>
>
> int main(int argc, char** argv)
> {
>     MPI_Init(&argc, &argv);
>
>     MPI_Comm world = MPI_COMM_WORLD;
>
>     int rank;
>     MPI_Comm_rank(world, &rank);
>
>     MPI_Comm local;
>     MPI_Comm_split(world, rank, 0, &local);
>
>     MPI_Finalize();
> }
>
> mpicc test-mpi.c -o test-mpi
> mpirun -n 2 ./test-mpi
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