Thomas, can you please elaborate ? I checked the code of opal_os_dirpath_create and could not find where such a thing can happen
Thanks, Gilles On Wednesday, July 29, 2015, Thomas Jahns <ja...@dkrz.de> wrote: > Hello, > > On 07/28/15 17:34, Schlottke-Lakemper, Michael wrote: > >> That’s what I suspected. Thank you for your confirmation. >> > > you are mistaken, the allocation is 51 bytes long, i.e. valid bytes are at > offsets 0 to 50. But since the read of 4 bytes starts at offset 48, the > bytes at offsets 48, 49, 50 and 51 get read, the last of which is illegal. > It probably does no harm at the moment in practice, because virtually all > allocators always add some padding to the next multiple of some power of 2. > But still this means the program is incorrect in terms of any programming > language definition involved (might be C, C++ or Fortran). > > Regards, Thomas > > On 25 Jul 2015, at 16:10 , Ralph Castain <r...@open-mpi.org >>> <mailto:r...@open-mpi.org>> wrote: >>> >>> Looks to me like a false positive - we do malloc some space, and do >>> access >>> different parts of it. However, it looks like we are inside the space at >>> all >>> times. >>> >>> I’d suppress it >>> >>> >>> On Jul 23, 2015, at 12:47 AM, Schlottke-Lakemper, Michael >>>> <m.schlottke-lakem...@aia.rwth-aachen.de >>>> <mailto:m.schlottke-lakem...@aia.rwth-aachen.de>> wrote: >>>> >>>> Hi folks, >>>> >>>> recently we’ve been getting a Valgrind error in PMPI_Init for our suite >>>> of >>>> regression tests: >>>> >>>> ==5922== Invalid read of size 4 >>>> ==5922== at 0x61CC5C0: opal_os_dirpath_create (in >>>> /aia/opt/openmpi-1.8.7/lib64/libopen-pal.so.6.2.2) >>>> ==5922== by 0x5F207E5: orte_session_dir (in >>>> /aia/opt/openmpi-1.8.7/lib64/libopen-rte.so.7.0.6) >>>> ==5922== by 0x5F34F04: orte_ess_base_app_setup (in >>>> /aia/opt/openmpi-1.8.7/lib64/libopen-rte.so.7.0.6) >>>> ==5922== by 0x7E96679: rte_init (in >>>> /aia/opt/openmpi-1.8.7/lib64/openmpi/mca_ess_env.so) >>>> ==5922== by 0x5F12A77: orte_init (in >>>> /aia/opt/openmpi-1.8.7/lib64/libopen-rte.so.7.0.6) >>>> ==5922== by 0x509883C: ompi_mpi_init (in >>>> /aia/opt/openmpi-1.8.7/lib64/libmpi.so.1.6.2) >>>> ==5922== by 0x50B843A: PMPI_Init (in >>>> /aia/opt/openmpi-1.8.7/lib64/libmpi.so.1.6.2) >>>> ==5922== by 0xEBA79C: ZFS::run() (in >>>> >>>> /aia/r018/scratch/mic/.zfstester/.zacc_cron/zacc_cron_r9063/zfs_gnu_production) >>>> ==5922== by 0x4DC243: main (in >>>> >>>> /aia/r018/scratch/mic/.zfstester/.zacc_cron/zacc_cron_r9063/zfs_gnu_production) >>>> ==5922== Address 0x710f670 is 48 bytes inside a block of size 51 >>>> alloc'd >>>> ==5922== at 0x4C29110: malloc (in >>>> /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) >>>> ==5922== by 0x61CC572: opal_os_dirpath_create (in >>>> /aia/opt/openmpi-1.8.7/lib64/libopen-pal.so.6.2.2) >>>> ==5922== by 0x5F207E5: orte_session_dir (in >>>> /aia/opt/openmpi-1.8.7/lib64/libopen-rte.so.7.0.6) >>>> ==5922== by 0x5F34F04: orte_ess_base_app_setup (in >>>> /aia/opt/openmpi-1.8.7/lib64/libopen-rte.so.7.0.6) >>>> ==5922== by 0x7E96679: rte_init (in >>>> /aia/opt/openmpi-1.8.7/lib64/openmpi/mca_ess_env.so) >>>> ==5922== by 0x5F12A77: orte_init (in >>>> /aia/opt/openmpi-1.8.7/lib64/libopen-rte.so.7.0.6) >>>> ==5922== by 0x509883C: ompi_mpi_init (in >>>> /aia/opt/openmpi-1.8.7/lib64/libmpi.so.1.6.2) >>>> ==5922== by 0x50B843A: PMPI_Init (in >>>> /aia/opt/openmpi-1.8.7/lib64/libmpi.so.1.6.2) >>>> ==5922== by 0xEBA79C: ZFS::run() (in >>>> >>>> /aia/r018/scratch/mic/.zfstester/.zacc_cron/zacc_cron_r9063/zfs_gnu_production) >>>> ==5922== by 0x4DC243: main (in >>>> >>>> /aia/r018/scratch/mic/.zfstester/.zacc_cron/zacc_cron_r9063/zfs_gnu_production) >>>> ==5922== >>>> >>>> What is weird is that it seems to depend on the pbs/torque session >>>> we’re in: >>>> sometimes the error does not occur and all and all tests run fine (this >>>> is in >>>> fact the only Valgrind error we’re having at the moment). Other times >>>> every >>>> single test we’re running has this error. >>>> >>>> Has anyone seen this or might be able to offer an explanation? If it is >>>> a >>>> false-positive, I’d be happy to suppress it :) >>>> >>>> Thanks a lot in advance >>>> >>>> Michael >>>> >>>> P.S.: This error is not covered/suppressed by the default ompi >>>> suppression >>>> file in $PREFIX/share/openmpi. >>>> >>>> >>>> -- >>>> Michael Schlottke-Lakemper >>>> >>>> SimLab Highly Scalable Fluids & Solids Engineering >>>> Jülich Aachen Research Alliance (JARA-HPC) >>>> RWTH Aachen University >>>> Wüllnerstraße 5a >>>> 52062 Aachen >>>> Germany >>>> >>>> Phone: +49 (241) 80 95188 >>>> Fax: +49 (241) 80 92257 >>>> Mail: m.schlottke-lakem...@aia.rwth-aachen.de >>>> <mailto:m.schlottke-lakem...@aia.rwth-aachen.de> >>>> Web: http://www.jara.org/jara-hpc >>>> >>>> _______________________________________________ >>>> users mailing list >>>> us...@open-mpi.org <mailto:us...@open-mpi.org> >>>> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >>>> Link to this post: >>>> http://www.open-mpi.org/community/lists/users/2015/07/27303.php >>>> >>> >>> _______________________________________________ >>> users mailing list >>> us...@open-mpi.org <mailto:us...@open-mpi.org> >>> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >>> Link to this post: >>> http://www.open-mpi.org/community/lists/users/2015/07/27328.php >>> >> >> >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >> Link to this post: >> http://www.open-mpi.org/community/lists/users/2015/07/27348.php >> >> > > -- > Thomas Jahns > HD(CP)^2 > Abteilung Anwendungssoftware > > Deutsches Klimarechenzentrum GmbH > Bundesstraße 45a • D-20146 Hamburg • Germany > > Phone: +49 40 460094-151 > Fax: +49 40 460094-270 > Email: Thomas Jahns <ja...@dkrz.de> > URL: www.dkrz.de > > Geschäftsführer: Prof. Dr. Thomas Ludwig > Sitz der Gesellschaft: Hamburg > Amtsgericht Hamburg HRB 39784 > >
