On my El Capitan macbook I get a segfault when running the program below with more than a single process but only when MPICH has been compiled with Clang.

I don't get that good debug info but here is some of what I got

(lldb) c

Process 61129 resuming

Process 61129 stopped

* thread #1: tid = 0x32c438, 0x00000003119d0432 libpmpi.12.dylib`MPID_Request_create + 244, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)

    frame #0: 0x00000003119d0432 libpmpi.12.dylib`MPID_Request_create + 244

libpmpi.12.dylib`MPID_Request_create:

->  0x3119d0432 <+244>: movaps %xmm0, 0x230(%rax)

    0x3119d0439 <+251>: movq   $0x0, 0x240(%rax)

    0x3119d0444 <+262>: movl   %ecx, 0x210(%rax)

    0x3119d044a <+268>: popq   %rbp

My version of Clang is

Apple LLVM version 7.3.0 (clang-703.0.31)

Target: x86_64-apple-darwin15.6.0

Thread model: posix

InstalledDir: /Library/Developer/CommandLineTools/usr/bin

and the bug has been confirmed by my colleague who is running Linux and compiling with Clang 3.8. The program runs fine with OpenMPI+Clang.

#include <mpi.h>

#include <stdio.h>

#include <stdlib.h>

int main(int argc, char *argv[])

{

    MPI_Init(&argc, &argv);

    MPI_Comm comm = MPI_COMM_WORLD;

    uint64_t *A, *C;

    int rnk;

    MPI_Comm_rank(comm, &rnk);

    A = calloc(1, sizeof(uint64_t));

    C = calloc(2, sizeof(uint64_t));

    A[0] = rnk + 1;

    MPI_Allgather(A, 1, MPI_UINT64_T, C, 1, MPI_UINT64_T, comm);

    MPI_Finalize();

    return 0;

}

Best regards

Andreas Noack

Postdoctoral Associate

Computer Science and Artificial Intelligence Laboratory

Massachusetts Institute of Technology

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