Valgrind - Conditional jump

[Bezzina__Albert]

When we run our application under valgrind sometimes it is trowing this warning.  Note that it does not happen every time and we did not manage to reproduce it in a small application.  We running our application on Ubuntu 16.04.5 LTS machine and using gcc 5.4.0 20160609 compiler. Also we are using valgrind-3.14.0.

==63884== Conditional jump or move depends on uninitialised value(s)
==63884==    at 0xBE25B46: bool rml::internal::isLargeObject<(rml::internal::MemoryOrigin)1>(void*) (frontend.cpp:2431)
==63884==    by 0xBE1CFF3: rml::internal::isRecognized(void*) (frontend.cpp:2453)
==63884==    by 0xBE22755: rml::internal::internalPoolFree(rml::internal::MemoryPool*, void*, unsigned long) (frontend.cpp:2568)
==63884==    by 0xBE2290E: rml::internal::internalFree(void*) (frontend.cpp:2597)
==63884==    by 0xBE1DA34: scalable_aligned_free (frontend.cpp:3110)
==63884==    by 0x7687741: tbb::internal::NFS_Free(void*) (cache_aligned_allocator.cpp:205)
==63884==    by 0x42EDF9: tbb::cache_aligned_allocator<tbb::interface5::internal::hash_map_base::bucket>::deallocate(tbb::interface5::internal::hash_map_base::bucket*, unsigned long) (cache_aligned_allocator.h:88)
==63884==    by 0x7B3D41: tbb::interface5::concurrent_hash_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<logging::Logger, std::default_delete<logging::Logger> >, tbb::tbb_hash_compare<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, tbb::tbb_allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<logging::Logger, std::default_delete<logging::Logger> > > > >::clear() (concurrent_hash_map.h:1425)
==63884==    by 0x7B35A1: tbb::interface5::concurrent_hash_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<logging::Logger, std::default_delete<logging::Logger> >, tbb::tbb_hash_compare<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, tbb::tbb_allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<logging::Logger, std::default_delete<logging::Logger> > > > >::~concurrent_hash_map() (concurrent_hash_map.h:869)

Thanks and regards,

Albert

[Alexei_K_Intel]

Hi Albert,

It is a false positive. Consider the answers #19 and #20 on a similar question.

Regards
Alex