[Mvapich-discuss] Segmentation fault if MPI_Finalize is called without freeing objects with attributes attached

[Subramoni, Hari]

Dear, Simon.

Sorry to hear that you're facing this issue. 

Could you please let us know if this is a single node run or a multi-node run? Could you also let us know how MVAPICH was configured (output of mpiname -a) and what compiler versions were used?

Best,
Hari.

-----Original Message-----
From: Mvapich-discuss <mvapich-discuss-bounces+subramon=cse.ohio-state.edu at lists.osu.edu> On Behalf Of Simon Byrne via Mvapich-discuss
Sent: Saturday, December 31, 2022 1:26 PM
To: mvapich-discuss at lists.osu.edu
Subject: [Mvapich-discuss] Segmentation fault if MPI_Finalize is called without freeing objects with attributes attached

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If an object (e.g. MPI_Datatype) with attributes attached is not freed before calling MPI_Finalize, then a segmentation fault is triggered.

The following program reproduces the problem on Ookami with MVAPICH2 Version 2.3.6.

#include <mpi.h>
#include <stdlib.h>

int main(int argc, char** argv) {
    // Initialize the MPI environment
    MPI_Init(NULL, NULL);

    MPI_Datatype dup_type;
    MPI_Type_dup(MPI_UINT32_T, &dup_type);

    MPI_Type_commit(&dup_type);

    int keyval;
    MPI_Type_create_keyval(MPI_TYPE_NULL_COPY_FN,
                           MPI_TYPE_NULL_DELETE_FN,
                           &keyval, NULL);

    MPI_Type_set_attr(dup_type, keyval, NULL);

    MPI_Finalize();
    return 0;
}

See discussion on
https://urldefense.com/v3/__https://github.com/JuliaParallel/MPI.jl/issues/684*issuecomment-1358070525__;Iw!!KGKeukY!yamad_6dnm-uGgH45v9frkx3NJg0yxwtmWlIYc-u7-K8DblbvFe5wdnANzwOTI3xrh985GBilSdojykR5yRk5i92L7KGtw$
for more details.

Thanks,
Simon
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