[mvapich-discuss] Segmentation fault in MPI_Reduce using MPI_IN_PLACE and root != 0

[Akshay Venkatesh]

Hi Markus,

Can you send the exact call that you're making at the root and at the
non-root if it's not a hassle? The code snippet will rule out other things
before we conclude anything.

Thanks


On Tue, May 19, 2015 at 10:55 AM, Markus Geimer <mg1102 at web.de> wrote:

> Dear MVAPICH developers,
>
> While testing my MPI application with MVAPICH2 2.1, I ran
> into a segmentation fault.  After an in-depth investigation
> I could boil down the issue to the attached minimal example.
>
> Calling MPI_Reduce using MPI_IN_PLACE and root != 0 multiple
> times causes the segfault.  The example works for me with
> ITER <= 16, but fails with ITER >= 17.  If root == 0, it
> works regardless of the number of iterations. Note that the
> example also works fine with MPICH 3.1 and Open MPI 1.8.3.
>
> The test system is running Debian 7 with kernel 3.2.65; the
> compiler used is GCC 4.8.3 (built from vanilla source).
> Please find some more detailed information below.  If you
> need more -- or have a patch for me to try out -- please let
> me know.
>
> Thanks,
> Markus
>
> ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< -----
>
> $ mpiexec -n 2 ./a.out
> [host:mpi_rank_1][error_sighandler] Caught error: Segmentation fault
> (signal 11)
> [host:mpi_rank_1][print_backtrace]   0:
> /opt/mvapich2-2.1/lib/libmpi.so.12(print_backtrace+0x20) [0x7f553b6b404c]
> [host:mpi_rank_1][print_backtrace]   1:
> /opt/mvapich2-2.1/lib/libmpi.so.12(error_sighandler+0x77) [0x7f553b6b419e]
> [host:mpi_rank_1][print_backtrace]   2:
> /lib/x86_64-linux-gnu/libc.so.6(+0x321e0) [0x7f553ae331e0]
> [host:mpi_rank_1][print_backtrace]   3:
> /lib/x86_64-linux-gnu/libc.so.6(+0x12abd0) [0x7f553af2bbd0]
> [host:mpi_rank_1][print_backtrace]   4:
> /opt/mvapich2-2.1/lib/libmpi.so.12(+0x3f6857) [0x7f553b582857]
> [host:mpi_rank_1][print_backtrace]   5:
> /opt/mvapich2-2.1/lib/libmpi.so.12(MPIR_Localcopy+0x357) [0x7f553b5833b4]
> [host:mpi_rank_1][print_backtrace]   6:
> /opt/mvapich2-2.1/lib/libmpi.so.12(MPIR_Reduce_shmem_MV2+0x385)
> [0x7f553b2a3d50]
> [host:mpi_rank_1][print_backtrace]   7:
> /opt/mvapich2-2.1/lib/libmpi.so.12(MPIR_Reduce_two_level_helper_MV2+0x594)
> [0x7f553b2a57ec]
> [host:mpi_rank_1][print_backtrace]   8:
> /opt/mvapich2-2.1/lib/libmpi.so.12(MPIR_Reduce_index_tuned_intra_MV2+0x97b)
> [0x7f553b2a6af3]
> [host:mpi_rank_1][print_backtrace]   9:
> /opt/mvapich2-2.1/lib/libmpi.so.12(MPIR_Reduce_MV2+0x9f) [0x7f553b2a6ea0]
> [host:mpi_rank_1][print_backtrace]  10:
> /opt/mvapich2-2.1/lib/libmpi.so.12(MPIR_Reduce_impl+0x8c) [0x7f553b21534b]
> [host:mpi_rank_1][print_backtrace]  11:
> /opt/mvapich2-2.1/lib/libmpi.so.12(PMPI_Reduce+0x1709) [0x7f553b216b9b]
> [host:mpi_rank_1][print_backtrace]  12: ./a.out() [0x400838]
> [host:mpi_rank_1][print_backtrace]  13:
> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f553ae1fead]
> [host:mpi_rank_1][print_backtrace]  14: ./a.out() [0x4006c9]
>
> $ mpiname -a
> MVAPICH2 2.1 Fri Apr 03 20:00:00 EDT 2015 ch3:mrail
>
> Compilation
> CC: gcc    -g -O0
> CXX: g++   -g -O0
> F77: gfortran -L/lib -L/lib   -g -O0
> FC: gfortran   -g -O0
>
> Configuration
> --prefix=/opt/mvapich2-2.1 --enable-shared --enable-g=dbg --disable-fast
> --enable-debuginfo
>
> $ ibv_devinfo
> hca_id: qib0
>         transport:                      InfiniBand (0)
>         fw_ver:                         0.0.0
>         node_guid:                      0011:7500:00ff:d76b
>         sys_image_guid:                 0011:7500:00ff:d76b
>         vendor_id:                      0x1175
>         vendor_part_id:                 16
>         hw_ver:                         0x2
>         board_id:                       InfiniPath_QLE7140
>         phys_port_cnt:                  1
>                 port:   1
>                         state:                  PORT_ACTIVE (4)
>                         max_mtu:                4096 (5)
>                         active_mtu:             2048 (4)
>                         sm_lid:                 1
>                         port_lid:               1
>                         port_lmc:               0x00
>                         link_layer:             InfiniBand
>
> _______________________________________________
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>
>


-- 
-Akshay
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