On 14/03/2014 17:56, Jarrod Hadfield wrote:
Hi,
I'm using valgrind to check over some C/C++ code for an R library. I'm
R package?
getting the report (see below), but can't track down the uninitialised
value(s). I tried using --track-origins=yes in valgrind which gives:
==28258== Uninitialised value was created by a stack allocation
==28258== at 0xEE33D98: ??? (in /usr/lib64/R/lib/libRlapack.so)
I presume the problem is an uninitialised value being used in my code,
rather than in libRlapack, but there is a better way of tracking down
where it is?
You need debug symbols. Maybe available for your unstated platform, or
build a version of R with an internal LAPACK.
I doubt this is you: 'Writing R Extensions' has
'Note that memory access errors may be seen with LAPACK, BLAS and
Java-using packages: some at least of these seem to be intentional, and
some are related to passing characters to Fortran.'
Also, it is entirely possible that this is a non-current version of
LAPACK: quite a few things like this have been plugged recently. For
example, Fedora currently has 3.4.2 and 3.5.0 has been out for a lot
longer than Fedora 20.
Cheers,
Jarrod
R -d "valgrind --tool=memcheck --leak-check=full --track-origins=yes"
==28258== Conditional jump or move depends on uninitialised value(s)
==28258== at 0xEE87208: dstemr_ (in /usr/lib64/R/lib/libRlapack.so)
==28258== by 0xEE7F39B: dsyevr_ (in /usr/lib64/R/lib/libRlapack.so)
==28258== by 0x15B23BD9: ??? (in /usr/lib64/R/modules/lapack.so)
==28258== by 0x15B28397: ??? (in /usr/lib64/R/modules/lapack.so)
==28258== by 0x35CA4BFEAC: ??? (in /usr/lib64/R/lib/libR.so)
==28258== by 0x35CA4C8A1F: Rf_eval (in /usr/lib64/R/lib/libR.so)
==28258== by 0x35CA4BB310: Rf_applyClosure (in /usr/lib64/R/lib/libR.so)
==28258== by 0x35CA4C58F9: ??? (in /usr/lib64/R/lib/libR.so)
==28258== by 0x35CA4C8A1F: Rf_eval (in /usr/lib64/R/lib/libR.so)
==28258== by 0x35CA4BB310: Rf_applyClosure (in /usr/lib64/R/lib/libR.so)
==28258== by 0x35CA4C8ACC: Rf_eval (in /usr/lib64/R/lib/libR.so)
==28258== by 0x35CA4CAEE7: ??? (in /usr/lib64/R/lib/libR.so)
==28258== Uninitialised value was created by a stack allocation
==28258== at 0xEE33D98: ??? (in /usr/lib64/R/lib/libRlapack.so)
--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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