[Mvapich-discuss] MPI_Ssend causes segfault

[Subramoni, Hari]

Hi, Kent.

Can you please try to remove --with-device=ch3:sock from the configure line, reconfigure the MPI library and try again?

Thx,
Hari.

From: Mvapich-discuss <mvapich-discuss-bounces+subramoni.1=osu.edu at lists.osu.edu> On Behalf Of Kent Cheung via Mvapich-discuss
Sent: Friday, April 23, 2021 11:47 AM
To: mvapich-discuss at lists.osu.edu
Subject: [Mvapich-discuss] MPI_Ssend causes segfault

Hello,

I'm currently running into an issue with this example on a Rhel 8.3 x86_64 single node machine:

#include "mpi.h"

#include <stdio.h>

int main()
{
    int rank;

    MPI_Init(NULL, NULL);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);

    int number;
    if (rank == 0) {
        number = 42;
        MPI_Ssend(&number, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
    } else if (rank == 1) {
        MPI_Recv(&number, 1, MPI_INT, 0, 0, MPI_COMM_WORLD,
                 MPI_STATUS_IGNORE);
        printf("Process 1 received number %d from process 0\n",
               number);
    }

    MPI_Finalize();

    return 0;
}

Here is the backtrace:

#0  0x00007f96df5a6e28 in __memmove_avx_unaligned_erms () from /lib64/libc.so.6
#1  0x00007f96df93c8cc in MPIDI_CH3U_Receive_data_found () from /lib/libmpi.so.12
#2  0x00007f96df95ef02 in MPIDI_CH3_PktHandler_EagerSyncSend () from /lib/libmpi.so.12
#3  0x00007f96df96eb71 in MPIDI_CH3I_Progress_handle_sock_event () from /lib/libmpi.so.12
#4  0x00007f96df96ef1e in MPIDI_CH3I_Progress () from /lib/libmpi.so.12
#5  0x00007f96df8e5713 in PMPI_Recv () from /lib/libmpi.so.12
#6  0x00000000004007d6 in main () at main.c:17


If I change MPI_Ssend to MPI_Send, the program runs to completion. If I build and test with OpenMPI 4.1.0, the program runs to completion with either call. For reference, I am using GCC 10.2.0 and the configuration options for MVAPICH2 were

--enable-debug --enable-shared --enable-debuginfo --enable-sharedlib=gcc --with-device=ch3:sock

Is there are configuration flag I require to resolve this or an issue with the example?

Thanks,
Kent

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