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 itOn 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
smime.p7s
Description: S/MIME Cryptographic Signature
