[mpich-discuss] MPICH-3.2: SIGSEGV in MPID_Request_create () at src/mpid/ch3/src/ch3u_request.c:101

[Jeff Hammond]

On Wed, Sep 7, 2016 at 3:25 PM, Halim Amer <aamer at anl.gov> wrote:
>
> Regrading missing symbols from dynamic libraries when using gdb on Mac
OS, I personally never managed to make it work, not just with MPICH, but
also with other libraries. I consistently do static builds to avoid this
problem. If you are able to see symbols from other libraries, we might want
to look into this as well.

For what it's worth, I've found that lldb works a lot better on Mac, which
is not too surprising, since that is what Apple ships.  I recall that I
need to compile with "-Wl,-pie" to get the best debugging experience.

The commands for LLDB are a bit different from GDB but they are intuitive (
http://lldb.llvm.org/tutorial.html).

I'm not sure if it helps, but this is what I observed just now...

I built my code with these options:

$ make CC=/opt/mpich/dev/gcc/default/bin/mpicc CFLAGS="-g -O2 -Wall
-Wl,-pie"

MPICH is included as a shared library:

$ otool -L win_fence.x
win_fence.x:
/opt/mpich/dev/gcc/default/lib/libmpi.0.dylib (compatibility version 1.0.0,
current version 1.0.0)
/opt/mpich/dev/gcc/default/lib/libpmpi.0.dylib (compatibility version
1.0.0, current version 1.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version
1226.10.1)
/usr/local/lib/gcc/6/libgcc_s.1.dylib (compatibility version 1.0.0, current
version 1.0.0)

MPICH is built with GCC 6.1.0 with standard options (and debug symbols):

$ /opt/mpich/dev/gcc/default/bin/mpicc -show
gcc-6 -g -Wl,-flat_namespace -Wl,-commons,use_dylibs
-I/opt/mpich/dev/gcc/default/include -L/opt/mpich/dev/gcc/default/lib -lmpi
-lpmpi

$ /opt/mpich/dev/gcc/default/bin/mpichversion
MPICH Version:    3.3a1
MPICH Release date: unreleased development copy
MPICH Device:    ch3:nemesis
MPICH configure: CC=gcc-6 CXX=g++-6 FC=gfortran-6 F77=gfortran-6
--enable-cxx --enable-fortran --enable-threads=runtime --enable-g=dbg
--with-pm=hydra --prefix=/opt/mpich/dev/gcc/default --enable-wrapper-rpath
--disable-static --enable-shared
MPICH CC: gcc-6    -g -O2
MPICH CXX: g++-6   -g
MPICH F77: gfortran-6   -g
MPICH FC: gfortran-6   -g
MPICH Custom Information:

The following shows the debug symbols including line numbers into MPICH
source:

$ lldb ./win_fence.x
(lldb) target create "./win_fence.x"
Current executable set to './win_fence.x' (x86_64).
(lldb) breakpoint set -n MPIR_Barrier_impl
Breakpoint 1: where = libpmpi.0.dylib`MPIR_Barrier_impl + 1 at
barrier.c:306, address = 0x000000000000af71
(lldb) run
Process 87575 launched: './win_fence.x' (x86_64)
SUCCESS!
Process 87575 stopped
* thread #1: tid = 0x2c927c, 0x0000000100144f71
libpmpi.0.dylib`MPIR_Barrier_impl(comm_ptr=0x0000000100391c60,
errflag=0x00007fff5fbfef5c) + 1 at barrier.c:306, queue =
'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x0000000100144f71
libpmpi.0.dylib`MPIR_Barrier_impl(comm_ptr=0x0000000100391c60,
errflag=0x00007fff5fbfef5c) + 1 at barrier.c:306
   303 int MPIR_Barrier_impl(MPIR_Comm *comm_ptr, MPIR_Errflag_t *errflag)
   304 {
   305     int mpi_errno = MPI_SUCCESS;
-> 306     if (comm_ptr->coll_fns != NULL && comm_ptr->coll_fns->Barrier !=
NULL)
   307     {
   308 /* --BEGIN USEREXTENSION-- */
   309 mpi_errno = comm_ptr->coll_fns->Barrier(comm_ptr, errflag);
(lldb) bt
* thread #1: tid = 0x2c927c, 0x0000000100144f71
libpmpi.0.dylib`MPIR_Barrier_impl(comm_ptr=0x0000000100391c60,
errflag=0x00007fff5fbfef5c) + 1 at barrier.c:306, queue =
'com.apple.main-thread', stop reason = breakpoint 1.1
  * frame #0: 0x0000000100144f71
libpmpi.0.dylib`MPIR_Barrier_impl(comm_ptr=0x0000000100391c60,
errflag=0x00007fff5fbfef5c) + 1 at barrier.c:306
    frame #1: 0x0000000100276788
libpmpi.0.dylib`MPID_Win_free(win_ptr=0x00007fff5fbfef88) + 328 at
mpidi_rma.c:181
    frame #2: 0x00000001000655f1
libmpi.0.dylib`MPI_Win_free(win=0x00007fff5fbfeff0) + 513 at win_free.c:119
    frame #3: 0x0000000100000e20 win_fence.x`main(argc=<unavailable>,
argv=<unavailable>) + 336 at win_fence.c:64
    frame #4: 0x00007fff8afd45ad libdyld.dylib`start + 1

Jeff



--
Jeff Hammond
jeff.science at gmail.com
http://jeffhammond.github.io/
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