Florian,
which distro are you running on ?
if you are not using stock gcc and valgrind, can you tell which version you
are running ?
last but not least, how did you configure openmpi ?
Cheers,
Gilles
On Thursday, March 3, 2016, Florian Lindner <mailingli...@xgm.de> wrote:
> I am still getting errors, even with your script.
>
> I will also try to modified build of openmpi that Jeff suggested.
>
> Best,
> Florian
>
> % mpicxx -std=c++11 -g -O0 -Wall -Wextra -fno-builtin-strlen
> mpi_gilles.cpp && mpirun -n 2 ./a.out
> Stringlength = 64
> 123456789012345678901234567890123456789012345678901234567890123
>
> % LD_PRELOAD=/usr/lib/valgrind/libmpiwrap-amd64-linux.so mpirun -n 2
> valgrind ./a.out
> ==5324== Memcheck, a memory error detector
> ==5324== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
> ==5324== Using Valgrind-3.12.0.SVN and LibVEX; rerun with -h for copyright
> info
> ==5324== Command: ./a.out
> ==5324==
> ==5325== Memcheck, a memory error detector
> ==5325== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
> ==5325== Using Valgrind-3.12.0.SVN and LibVEX; rerun with -h for copyright
> info
> ==5325== Command: ./a.out
> ==5325==
> valgrind MPI wrappers 5324: Active for pid 5324
> valgrind MPI wrappers 5324: Try MPIWRAP_DEBUG=help for possible options
> valgrind MPI wrappers 5325: Active for pid 5325
> valgrind MPI wrappers 5325: Try MPIWRAP_DEBUG=help for possible options
> Stringlength = 64
> ==5325== Invalid read of size 1
> ==5325== at 0x4C2D992: strlen (in
> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==5325== by 0x56852D8: length (char_traits.h:267)
> ==5325== by 0x56852D8: std::basic_ostream<char, std::char_traits<char>
> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*) (ostream:562)
> ==5325== by 0x408A45: receive() (mpi_gilles.cpp:22)
> ==5325== by 0x408B88: main (mpi_gilles.cpp:44)
> ==5325== Address 0xffefff800 is on thread 1's stack
> ==5325== in frame #2, created by receive() (mpi_gilles.cpp:8)
> ==5325==
> ==5325== Invalid read of size 1
> ==5325== at 0x4C2D9A4: strlen (in
> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==5325== by 0x56852D8: length (char_traits.h:267)
> ==5325== by 0x56852D8: std::basic_ostream<char, std::char_traits<char>
> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*) (ostream:562)
> ==5325== by 0x408A45: receive() (mpi_gilles.cpp:22)
> ==5325== by 0x408B88: main (mpi_gilles.cpp:44)
> ==5325== Address 0xffefff801 is on thread 1's stack
> ==5325== in frame #2, created by receive() (mpi_gilles.cpp:8)
> ==5325==
> ==5325== Invalid read of size 1
> ==5325== at 0x60A0FF1: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> libc-2.23.so)
> ==5325== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> ==5325== by 0x5684F75: sputn (streambuf:451)
> ==5325== by 0x5684F75: __ostream_write<char, std::char_traits<char> >
> (ostream_insert.h:50)
> ==5325== by 0x5684F75: std::basic_ostream<char, std::char_traits<char>
> >& std::__ostream_insert<char, std::char_traits<char>
> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)
> (ostream_insert.h:101)
> ==5325== by 0x56852E6: std::basic_ostream<char, std::char_traits<char>
> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*) (ostream:561)
> ==5325== by 0x408A45: receive() (mpi_gilles.cpp:22)
> ==5325== by 0x408B88: main (mpi_gilles.cpp:44)
> ==5325== Address 0xffefff83e is on thread 1's stack
> ==5325== in frame #4, created by receive() (mpi_gilles.cpp:8)
> ==5325==
> ==5325== Invalid read of size 1
> ==5325== at 0x60A100D: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> libc-2.23.so)
> ==5325== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> ==5325== by 0x5684F75: sputn (streambuf:451)
> ==5325== by 0x5684F75: __ostream_write<char, std::char_traits<char> >
> (ostream_insert.h:50)
> ==5325== by 0x5684F75: std::basic_ostream<char, std::char_traits<char>
> >& std::__ostream_insert<char, std::char_traits<char>
> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)
> (ostream_insert.h:101)
> ==5325== by 0x56852E6: std::basic_ostream<char, std::char_traits<char>
> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*) (ostream:561)
> ==5325== by 0x408A45: receive() (mpi_gilles.cpp:22)
> ==5325== by 0x408B88: main (mpi_gilles.cpp:44)
> ==5325== Address 0xffefff83d is on thread 1's stack
> ==5325== in frame #4, created by receive() (mpi_gilles.cpp:8)
> ==5325==
> ==5325== Invalid read of size 8
> ==5325== at 0x4C2F758: __GI_memcpy (in
> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==5325== by 0x60A0F3A: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> libc-2.23.so)
> ==5325== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> ==5325== by 0x5684F75: sputn (streambuf:451)
> ==5325== by 0x5684F75: __ostream_write<char, std::char_traits<char> >
> (ostream_insert.h:50)
> ==5325== by 0x5684F75: std::basic_ostream<char, std::char_traits<char>
> >& std::__ostream_insert<char, std::char_traits<char>
> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)
> (ostream_insert.h:101)
> ==5325== by 0x56852E6: std::basic_ostream<char, std::char_traits<char>
> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*) (ostream:561)
> ==5325== by 0x408A45: receive() (mpi_gilles.cpp:22)
> ==5325== by 0x408B88: main (mpi_gilles.cpp:44)
> ==5325== Address 0xffefff800 is on thread 1's stack
> ==5325== in frame #5, created by receive() (mpi_gilles.cpp:8)
> ==5325==
> ==5325== Invalid read of size 8
> ==5325== at 0x4C2F766: __GI_memcpy (in
> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==5325== by 0x60A0F3A: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> libc-2.23.so)
> ==5325== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> ==5325== by 0x5684F75: sputn (streambuf:451)
> ==5325== by 0x5684F75: __ostream_write<char, std::char_traits<char> >
> (ostream_insert.h:50)
> ==5325== by 0x5684F75: std::basic_ostream<char, std::char_traits<char>
> >& std::__ostream_insert<char, std::char_traits<char>
> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)
> (ostream_insert.h:101)
> ==5325== by 0x56852E6: std::basic_ostream<char, std::char_traits<char>
> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*) (ostream:561)
> ==5325== by 0x408A45: receive() (mpi_gilles.cpp:22)
> ==5325== by 0x408B88: main (mpi_gilles.cpp:44)
> ==5325== Address 0xffefff810 is on thread 1's stack
> ==5325== in frame #5, created by receive() (mpi_gilles.cpp:8)
> ==5325==
> ==5325== Invalid read of size 2
> ==5325== at 0x4C2F7B0: __GI_memcpy (in
> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==5325== by 0x60A0F3A: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> libc-2.23.so)
> ==5325== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> ==5325== by 0x5684F75: sputn (streambuf:451)
> ==5325== by 0x5684F75: __ostream_write<char, std::char_traits<char> >
> (ostream_insert.h:50)
> ==5325== by 0x5684F75: std::basic_ostream<char, std::char_traits<char>
> >& std::__ostream_insert<char, std::char_traits<char>
> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)
> (ostream_insert.h:101)
> ==5325== by 0x56852E6: std::basic_ostream<char, std::char_traits<char>
> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*) (ostream:561)
> ==5325== by 0x408A45: receive() (mpi_gilles.cpp:22)
> ==5325== by 0x408B88: main (mpi_gilles.cpp:44)
> ==5325== Address 0xffefff838 is on thread 1's stack
> ==5325== in frame #5, created by receive() (mpi_gilles.cpp:8)
> ==5325==
> ==5325== Invalid read of size 2
> ==5325== at 0x4C2F7BE: __GI_memcpy (in
> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==5325== by 0x60A0F3A: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> libc-2.23.so)
> ==5325== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> ==5325== by 0x5684F75: sputn (streambuf:451)
> ==5325== by 0x5684F75: __ostream_write<char, std::char_traits<char> >
> (ostream_insert.h:50)
> ==5325== by 0x5684F75: std::basic_ostream<char, std::char_traits<char>
> >& std::__ostream_insert<char, std::char_traits<char>
> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)
> (ostream_insert.h:101)
> ==5325== by 0x56852E6: std::basic_ostream<char, std::char_traits<char>
> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*) (ostream:561)
> ==5325== by 0x408A45: receive() (mpi_gilles.cpp:22)
> ==5325== by 0x408B88: main (mpi_gilles.cpp:44)
> ==5325== Address 0xffefff83c is on thread 1's stack
> ==5325== in frame #5, created by receive() (mpi_gilles.cpp:8)
> ==5325==
> ==5325== Invalid read of size 1
> ==5325== at 0x4C2F7E8: __GI_memcpy (in
> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==5325== by 0x60A0F3A: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> libc-2.23.so)
> ==5325== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> ==5325== by 0x5684F75: sputn (streambuf:451)
> ==5325== by 0x5684F75: __ostream_write<char, std::char_traits<char> >
> (ostream_insert.h:50)
> ==5325== by 0x5684F75: std::basic_ostream<char, std::char_traits<char>
> >& std::__ostream_insert<char, std::char_traits<char>
> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)
> (ostream_insert.h:101)
> ==5325== by 0x56852E6: std::basic_ostream<char, std::char_traits<char>
> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*) (ostream:561)
> ==5325== by 0x408A45: receive() (mpi_gilles.cpp:22)
> ==5325== by 0x408B88: main (mpi_gilles.cpp:44)
> ==5325== Address 0xffefff83e is on thread 1's stack
> ==5325== in frame #5, created by receive() (mpi_gilles.cpp:8)
> ==5325==
> 123456789012345678901234567890123456789012345678901234567890123
> ==5325==
> ==5325== HEAP SUMMARY:
> ==5325== in use at exit: 96,351 bytes in 247 blocks
> ==5325== total heap usage: 15,007 allocs, 14,760 frees, 13,362,050 bytes
> allocated
> ==5325==
> ==5325== LEAK SUMMARY:
> ==5325== definitely lost: 9,154 bytes in 39 blocks
> ==5325== indirectly lost: 4,008 bytes in 22 blocks
> ==5325== possibly lost: 0 bytes in 0 blocks
> ==5325== still reachable: 83,189 bytes in 186 blocks
> ==5325== suppressed: 0 bytes in 0 blocks
> ==5325== Rerun with --leak-check=full to see details of leaked memory
> ==5325==
> ==5325== For counts of detected and suppressed errors, rerun with: -v
> ==5325== ERROR SUMMARY: 138 errors from 9 contexts (suppressed: 0 from 0)
> ==5324==
> ==5324== HEAP SUMMARY:
> ==5324== in use at exit: 96,351 bytes in 247 blocks
> ==5324== total heap usage: 15,028 allocs, 14,781 frees, 13,370,286 bytes
> allocated
> ==5324==
> ==5324== LEAK SUMMARY:
> ==5324== definitely lost: 9,154 bytes in 39 blocks
> ==5324== indirectly lost: 4,008 bytes in 22 blocks
> ==5324== possibly lost: 0 bytes in 0 blocks
> ==5324== still reachable: 83,189 bytes in 186 blocks
> ==5324== suppressed: 0 bytes in 0 blocks
> ==5324== Rerun with --leak-check=full to see details of leaked memory
> ==5324==
> ==5324== For counts of detected and suppressed errors, rerun with: -v
> ==5324== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
>
>
> Am Donnerstag, 3. März 2016, 14:53:24 CET schrieb Gilles Gouaillardet:
> > I was unable to reproduce this in my environment.
> >
> > here is a slightly modified version of your test program.
> > buffers are 64 bytes aligned and the string (including the null
> > terminator) is 64 bytes long,
> > hopefully, strlen will not complain any more.
> >
> > Cheers,
> >
> > Gilles
> >
> > On 3/3/2016 12:51 AM, Florian Lindner wrote:
> > > Hello Gilles,
> > >
> > > Am Mittwoch, 2. März 2016, 23:36:56 CET schrieb Gilles Gouaillardet:
> > >> Florian,
> > >>
> > >> under the hood, strlen() can use vector instructions, and then read
> memory
> > >> above the end of the string. valgrind is extremely picky and does warn
> > >> about that.
> > >> iirc, there are some filter options not to issue these warnings, but I
> > >> forgot the details.
> > > Ok, i'll try to research in that direction.
> > >
> > >> can you try to send "Bonjour" instead of "Halo" and see if the warning
> > >> disappear ?
> > > They are still there. But, was this meant as a joke or didn't I
> understand?
> > >
> > > Best,
> > > Florian
> > >
> > >> Cheers,
> > >>
> > >> Gilles
> > >>
> > >> PS if it works, do not jump to the erroneous conclusion valgrind likes
> > >> French and dislikes German ;-)
> > >>
> > >> On Wednesday, March 2, 2016, Florian Lindner <mailingli...@xgm.de
> <javascript:;>> wrote:
> > >>
> > >>> Hello,
> > >>>
> > >>> using OpenMPI 1.10.2 and valgrind 3.11.0 I try to use the code below
> to
> > >>> send a c++ string.
> > >>>
> > >>> It works fine, but running through valgrind gives a lot of memory
> errors,
> > >>> invalid read of size...
> > >>>
> > >>> What is going wrong there?
> > >>>
> > >>> Valgrind output, see below.
> > >>>
> > >>> Thanks!
> > >>> Florian
> > >>>
> > >>>
> > >>> // Compile with: mpicxx -std=c++11 -g -O0 -Wall -Wextra mpi.cpp
> > >>> #include <mpi.h>
> > >>> #include <iostream>
> > >>> #include <string>
> > >>>
> > >>> using namespace std;
> > >>>
> > >>>
> > >>> void receive() {
> > >>> int length = 0;
> > >>> MPI_Status status;
> > >>> MPI_Probe(MPI_ANY_SOURCE, 0, MPI_COMM_WORLD, &status);
> > >>> MPI_Get_count(&status, MPI_CHAR, &length);
> > >>> cout << "Stringlength = " << length << endl;
> > >>> char cstr[length];
> > >>> MPI_Recv(cstr,
> > >>> length,
> > >>> MPI_CHAR,
> > >>> MPI_ANY_SOURCE,
> > >>> MPI_ANY_TAG,
> > >>> MPI_COMM_WORLD,
> > >>> MPI_STATUS_IGNORE);
> > >>> cout << cstr << endl;
> > >>> }
> > >>>
> > >>> void send(int rankReceiver) {
> > >>> std::string s = "Hallo";
> > >>> MPI_Send(s.c_str(),
> > >>> s.size()+1,
> > >>> MPI_CHAR,
> > >>> rankReceiver,
> > >>> 0,
> > >>> MPI_COMM_WORLD);
> > >>> }
> > >>>
> > >>> int main(int argc, char* argv[])
> > >>> {
> > >>> int rank;
> > >>> MPI_Init(&argc, &argv);
> > >>>
> > >>> MPI_Comm_rank(MPI_COMM_WORLD, &rank);
> > >>> if (rank == 0)
> > >>> send(1);
> > >>> else {
> > >>> receive();
> > >>> }
> > >>> MPI_Finalize();
> > >>> return 0;
> > >>> }
> > >>>
> > >>>
> > >>> VALGRIND OUTPUT
> > >>>
> > >>> % mpicxx -std=c++11 -g -O0 -Wall -Wextra mpi.cpp && mpirun -n 2
> ./a.out
> > >>> Stringlength = 6
> > >>> Hallo
> > >>> florian@asaru ~/scratch (git)-[master] %
> > >>> LD_PRELOAD=/usr/lib/valgrind/libmpiwrap-amd64-linux.so mpirun -n 2
> valgrind
> > >>> ./a.out
> > >>> ==9290== Memcheck, a memory error detector
> > >>> ==9290== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et
> al.
> > >>> ==9290== Using Valgrind-3.11.0 and LibVEX; rerun with -h for
> copyright info
> > >>> ==9290== Command: ./a.out
> > >>> ==9290==
> > >>> ==9291== Memcheck, a memory error detector
> > >>> ==9291== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et
> al.
> > >>> ==9291== Using Valgrind-3.11.0 and LibVEX; rerun with -h for
> copyright info
> > >>> ==9291== Command: ./a.out
> > >>> ==9291==
> > >>> valgrind MPI wrappers 9290: Active for pid 9290
> > >>> valgrind MPI wrappers 9291: Active for pid 9291
> > >>> valgrind MPI wrappers 9290: Try MPIWRAP_DEBUG=help for possible
> options
> > >>> valgrind MPI wrappers 9291: Try MPIWRAP_DEBUG=help for possible
> options
> > >>> Stringlength = 6
> > >>> ==9291== Invalid read of size 1
> > >>> ==9291== at 0x4C2DBA2: strlen (in
> > >>> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> > >>> ==9291== by 0x56852D8: length (char_traits.h:267)
> > >>> ==9291== by 0x56852D8: std::basic_ostream<char,
> std::char_traits<char>
> > >>>> & std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> > >>> std::char_traits<char> >&, char const*) (ostream:562)
> > >>> ==9291== by 0x408A39: receive() (mpi.cpp:22)
> > >>> ==9291== by 0x408B61: main (mpi.cpp:46)
> > >>> ==9291== Address 0xffefff870 is on thread 1's stack
> > >>> ==9291== in frame #2, created by receive() (mpi.cpp:8)
> > >>> ==9291==
> > >>> ==9291== Invalid read of size 1
> > >>> ==9291== at 0x4C2DBB4: strlen (in
> > >>> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> > >>> ==9291== by 0x56852D8: length (char_traits.h:267)
> > >>> ==9291== by 0x56852D8: std::basic_ostream<char,
> std::char_traits<char>
> > >>>> & std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> > >>> std::char_traits<char> >&, char const*) (ostream:562)
> > >>> ==9291== by 0x408A39: receive() (mpi.cpp:22)
> > >>> ==9291== by 0x408B61: main (mpi.cpp:46)
> > >>> ==9291== Address 0xffefff871 is on thread 1's stack
> > >>> ==9291== in frame #2, created by receive() (mpi.cpp:8)
> > >>> ==9291==
> > >>> ==9291== Invalid read of size 1
> > >>> ==9291== at 0x60A0FF1: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> > >>> libc-2.23.so)
> > >>> ==9291== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> > >>> ==9291== by 0x5684F75: sputn (streambuf:451)
> > >>> ==9291== by 0x5684F75: __ostream_write<char,
> std::char_traits<char> >
> > >>> (ostream_insert.h:50)
> > >>> ==9291== by 0x5684F75: std::basic_ostream<char,
> std::char_traits<char>
> > >>>> & std::__ostream_insert<char, std::char_traits<char>
> > >>>> (std::basic_ostream<char, std::char_traits<char> >&, char const*,
> long)
> > >>> (ostream_insert.h:101)
> > >>> ==9291== by 0x56852E6: std::basic_ostream<char,
> std::char_traits<char>
> > >>>> & std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> > >>> std::char_traits<char> >&, char const*) (ostream:561)
> > >>> ==9291== by 0x408A39: receive() (mpi.cpp:22)
> > >>> ==9291== by 0x408B61: main (mpi.cpp:46)
> > >>> ==9291== Address 0xffefff874 is on thread 1's stack
> > >>> ==9291== in frame #4, created by receive() (mpi.cpp:8)
> > >>> ==9291==
> > >>> ==9291== Invalid read of size 1
> > >>> ==9291== at 0x60A100D: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> > >>> libc-2.23.so)
> > >>> ==9291== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> > >>> ==9291== by 0x5684F75: sputn (streambuf:451)
> > >>> ==9291== by 0x5684F75: __ostream_write<char,
> std::char_traits<char> >
> > >>> (ostream_insert.h:50)
> > >>> ==9291== by 0x5684F75: std::basic_ostream<char,
> std::char_traits<char>
> > >>>> & std::__ostream_insert<char, std::char_traits<char>
> > >>>> (std::basic_ostream<char, std::char_traits<char> >&, char const*,
> long)
> > >>> (ostream_insert.h:101)
> > >>> ==9291== by 0x56852E6: std::basic_ostream<char,
> std::char_traits<char>
> > >>>> & std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> > >>> std::char_traits<char> >&, char const*) (ostream:561)
> > >>> ==9291== by 0x408A39: receive() (mpi.cpp:22)
> > >>> ==9291== by 0x408B61: main (mpi.cpp:46)
> > >>> ==9291== Address 0xffefff873 is on thread 1's stack
> > >>> ==9291== in frame #4, created by receive() (mpi.cpp:8)
> > >>> ==9291==
> > >>> ==9291== Invalid read of size 2
> > >>> ==9291== at 0x4C2F9C0: __GI_memcpy (in
> > >>> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> > >>> ==9291== by 0x60A0F3A: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> > >>> libc-2.23.so)
> > >>> ==9291== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> > >>> ==9291== by 0x5684F75: sputn (streambuf:451)
> > >>> ==9291== by 0x5684F75: __ostream_write<char,
> std::char_traits<char> >
> > >>> (ostream_insert.h:50)
> > >>> ==9291== by 0x5684F75: std::basic_ostream<char,
> std::char_traits<char>
> > >>>> & std::__ostream_insert<char, std::char_traits<char>
> > >>>> (std::basic_ostream<char, std::char_traits<char> >&, char const*,
> long)
> > >>> (ostream_insert.h:101)
> > >>> ==9291== by 0x56852E6: std::basic_ostream<char,
> std::char_traits<char>
> > >>>> & std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> > >>> std::char_traits<char> >&, char const*) (ostream:561)
> > >>> ==9291== by 0x408A39: receive() (mpi.cpp:22)
> > >>> ==9291== by 0x408B61: main (mpi.cpp:46)
> > >>> ==9291== Address 0xffefff870 is on thread 1's stack
> > >>> ==9291== in frame #5, created by receive() (mpi.cpp:8)
> > >>> ==9291==
> > >>> ==9291== Invalid read of size 1
> > >>> ==9291== at 0x4C2F9F8: __GI_memcpy (in
> > >>> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> > >>> ==9291== by 0x60A0F3A: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/
> > >>> libc-2.23.so)
> > >>> ==9291== by 0x6096D1A: fwrite (in /usr/lib/libc-2.23.so)
> > >>> ==9291== by 0x5684F75: sputn (streambuf:451)
> > >>> ==9291== by 0x5684F75: __ostream_write<char,
> std::char_traits<char> >
> > >>> (ostream_insert.h:50)
> > >>> ==9291== by 0x5684F75: std::basic_ostream<char,
> std::char_traits<char>
> > >>>> & std::__ostream_insert<char, std::char_traits<char>
> > >>>> (std::basic_ostream<char, std::char_traits<char> >&, char const*,
> long)
> > >>> (ostream_insert.h:101)
> > >>> ==9291== by 0x56852E6: std::basic_ostream<char,
> std::char_traits<char>
> > >>>> & std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
> > >>> std::char_traits<char> >&, char const*) (ostream:561)
> > >>> ==9291== by 0x408A39: receive() (mpi.cpp:22)
> > >>> ==9291== by 0x408B61: main (mpi.cpp:46)
> > >>> ==9291== Address 0xffefff874 is on thread 1's stack
> > >>> ==9291== in frame #5, created by receive() (mpi.cpp:8)
> > >>> ==9291==
> > >>> Hallo
> > >>> ==9291==
> > >>> ==9291== HEAP SUMMARY:
> > >>> ==9291== in use at exit: 96,351 bytes in 247 blocks
> > >>> ==9291== total heap usage: 15,020 allocs, 14,773 frees, 13,362,383
> bytes
> > >>> allocated
> > >>> ==9291==
> > >>> ==9291== LEAK SUMMARY:
> > >>> ==9291== definitely lost: 9,154 bytes in 39 blocks
> > >>> ==9291== indirectly lost: 4,008 bytes in 22 blocks
> > >>> ==9291== possibly lost: 0 bytes in 0 blocks
> > >>> ==9291== still reachable: 83,189 bytes in 186 blocks
> > >>> ==9291== suppressed: 0 bytes in 0 blocks
> > >>> ==9291== Rerun with --leak-check=full to see details of leaked memory
> > >>> ==9291==
> > >>> ==9291== For counts of detected and suppressed errors, rerun with: -v
> > >>> ==9291== ERROR SUMMARY: 14 errors from 6 contexts (suppressed: 0
> from 0)
> > >>> ==9290==
> > >>> ==9290== HEAP SUMMARY:
> > >>> ==9290== in use at exit: 96,351 bytes in 247 blocks
> > >>> ==9290== total heap usage: 15,018 allocs, 14,771 frees, 13,370,045
> bytes
> > >>> allocated
> > >>> ==9290==
> > >>> ==9290== LEAK SUMMARY:
> > >>> ==9290== definitely lost: 9,154 bytes in 39 blocks
> > >>> ==9290== indirectly lost: 4,008 bytes in 22 blocks
> > >>> ==9290== possibly lost: 0 bytes in 0 blocks
> > >>> ==9290== still reachable: 83,189 bytes in 186 blocks
> > >>> ==9290== suppressed: 0 bytes in 0 blocks
> > >>> ==9290== Rerun with --leak-check=full to see details of leaked memory
> > >>> ==9290==
> > >>> ==9290== For counts of detected and suppressed errors, rerun with: -v
> > >>> ==9290== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from
> 0)
> > >>>
> > >>> _______________________________________________
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> > >>> Link to this post:
> > >>> http://www.open-mpi.org/community/lists/users/2016/03/28617.php
> > >>>
> > > _______________________________________________
> > > users mailing list
> > > us...@open-mpi.org <javascript:;>
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> > > Link to this post:
> http://www.open-mpi.org/community/lists/users/2016/03/28619.php
> > >
> >
> >
> _______________________________________________
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> Link to this post:
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