I have code that comes out clean in 1.39 (as unit-test and under valgrind), but under 1.40 it's not clean in valgrind and it crashes when run normally (malloc(): memory corruption). I'm trying to write a reproducer that is smaller than what I have, but incase something pops out at someone (or can point me where my code might be wrong), here is the valgrind output: Running 16 test cases... ==25074== Invalid write of size 8 ==25074== at 0x4E7D4A8: boost::shared_ptr<boost::re_detail::named_subexpressions_base<char>
::shared_ptr() (shared_ptr.hpp:182) ==25074== by 0x4E813C1: boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char cons t*, std::string> > > ::match_results(std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > > const&) (match_results.hpp:77) ==25074== by 0x5811371: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator <char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_rege x_traits<char> > > const&, boost::regex_constants::_match_flags) (perl_matcher_common.hpp:73) ==25074== by 0x4E856D2: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator <char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::perl_matcher(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::_ _normal_iterator<char const*, std::string>, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_i terator<char const*, std::string> > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, _ _gnu_cxx::__normal_iterator<char const*, std::string>) (perl_matcher.hpp:366) ==25074== by 0x4E8583A: bool boost::regex_search<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterat or<char const*, std::string>, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char c onst*, std::string> > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, __gnu_cxx::__no rmal_iterator<char const*, std::string>) (regex_search.hpp:55) ==25074== by 0x4E85BEF: boost::regex_token_iterator_implementation<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex _traits<char> > >::init(__gnu_cxx::__normal_iterator<char const*, std::string>) (regex_token_iterator.hpp:109) ==25074== by 0x4E8AC07: boost::regex_token_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::regex_token_iterator(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, boost::basic_regex<char, boost::regex _traits<char, boost::cpp_regex_traits<char> > > const&, int, boost::regex_constants::_match_flags) (regex_token_iterator.hpp:200) ==25074== by 0x45D99C: application_ut_suite::test_logon::test_method() (application_ut.cpp:139) ==25074== Address 0x6a64588 is 0 bytes after a block of size 56 alloc'd ==25074== at 0x4C2506C: operator new(unsigned long) (in /usr/lib64/valgrind/amd64-linux/vgpreload_memcheck.so) ==25074== by 0x5811362: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator <char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_rege x_traits<char> > > const&, boost::regex_constants::_match_flags) (perl_matcher_common.hpp:73) ==25074== by 0x4E856D2: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator <char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::perl_matcher(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::_ _normal_iterator<char const*, std::string>, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_i terator<char const*, std::string> > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, _ _gnu_cxx::__normal_iterator<char const*, std::string>) (perl_matcher.hpp:366) ==25074== by 0x4E8583A: bool boost::regex_search<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterat or<char const*, std::string>, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char c onst*, std::string> > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, __gnu_cxx::__no rmal_iterator<char const*, std::string>) (regex_search.hpp:55) ==25074== by 0x4E85BEF: boost::regex_token_iterator_implementation<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex _traits<char> > >::init(__gnu_cxx::__normal_iterator<char const*, std::string>) (regex_token_iterator.hpp:109) ==25074== by 0x4E8AC07: boost::regex_token_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::regex_token_iterator(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, boost::basic_regex<char, boost::regex _traits<char, boost::cpp_regex_traits<char> > > const&, int, boost::regex_constants::_match_flags) (regex_token_iterator.hpp:200) ==25074== by 0x442E4F: application_ut_suite::(anonymous namespace)::Test_Setup::Test_Setup(std::istream&, unsigned long) (application_ut.cpp:96) ==25074== by 0x45D99C: application_ut_suite::test_logon::test_method() (application_ut.cpp:139) ==25074== by 0x45F620: _ZN20application_ut_suiteL18test_logon_invokerEv (application_ut.cpp:133) ==25074== ==25074== Invalid write of size 8 ==25074== at 0x46CE8A: boost::detail::shared_count::shared_count() (shared_count.hpp:71) ==25074==:regex_traits<char, boost::cpp_regex_traits<char> > > const&, int, boost::regex_constants::_match_flags) (regex_token_iterator.hpp:200) ==25074== by 0x442E4F: application_ut_suite::(anonymous namespace)::Test_Setup::Test_Setup(std::istream&, unsigned long) (application_ut.cpp:96) ==25074== Address 0x6a64590 is 8 bytes after a block of size 56 alloc'd ==25074== at 0x4C2506C: operator new(unsigned long) (in /usr/lib64/valgrind/amd64-linux/vgpreload_memcheck.so) ==25074== by 0x5811362: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags) (perl_matcher_common.hpp:73) ==25074== by 0x4E856D2: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::perl_matcher(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::_cxx::__normal_iterator<char const*, std::string>, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, __gnu_cxx::__normal_iterator<char const*, std::string>) (regex_search.hpp:55) ==25074== by 0x4E85BEF: boost::regex_token_iterator_implementation<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::init(__gnu_cxx::__normal_iterator<char const*, std::string>) (regex_token_iterator.hpp:109) ==25074== by 0x4E8AC07: boost::regex_token_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::regex_token_iterator(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, int, boost::regex_constants::_match_flags) (regex_token_iterator.hpp:200) ==25074== by 0x442E4F: application_ut_suite::(anonymous namespace)::Test_Setup::Test_Setup(std::istream&, unsigned long) (application_ut.cpp:96) ==25074== by 0x45D99C: application_ut_suite::test_logon::test_method() (application_ut.cpp:139) ==250ub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > , boost::regex_traits<char, boost::cpp_regex_traits<char> > ::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags) (perl_matcher_common.hpp:73) ==25074== by 0x4E856D2: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::perl_matcher(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, __gnu_cxx::__normal_iterator<char const*, std::string>) (perl_matcher.hpp:366) ==25074== by 0x4E8583A: bool boost::regex_search<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, __gnu_cxx::__normal_iterator<char const*, std::string>) (regex_search.hpp:55) ==25074== by 0x4E85BEF: boost::regex_token_iterator_implementation<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::init(__gnu_cxx::__normal_iterator<char const*, snstants::_match_flags) (regex_token_iterator.hpp:200) ==25074== by 0x442E4F: application_ut_suite::(anonymous namespace)::Test_Setup::Test_Setup(std::istream&, unsigned long) (application_ut.cpp:96) ==25074== by 0x45D99C: application_ut_suite::test_logon::test_method() (application_ut.cpp:139) ==25074== by 0x45F620: _ZN20application_ut_suiteL18test_logon_invokerEv (application_ut.cpp:133) ==25074== Address 0x6a64598 is not stack'd, malloc'd or (recently) free'd **25074** new/new[] failed and should throw an exception, but Valgrind cannot throw exceptions and so is aborting instead. Sorry. ==25074== at 0x4C22E23: (within /usr/lib64/valgrind/amd64-linux/vgpreload_memcheck.so) ==25074== by 0x4C250C8: operator new(unsigned long) (in /usr/lib64/valgrind/amd64-linux/vgpreload_memcheck.so) ==25074== by 0x4E84680: __gnu_cxx::new_allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >::allocate(unsigned long, void const*) (new_allocator.h:92) ==25074== by 0x4E846AF: std::_Vector_base<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > > >::_M_allocate(unsigned long) (stl_vector.h:144) ==25074== by 0x4E8A4AE: std::vector<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*tor.tcc:395) ==25074== by 0x4E8A61E: std::vector<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > > ::insert(__gnu_cxx::__normal_iterator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> >*, std::vector<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > > > >, unsigned long, boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > const&) (stl_vector.h:792) ==25074== by 0x4E8A73B: boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > > >::set_size(unsigned long, __gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>) (match_results.hpp:399) ==25074== by 0x4E8B1BF: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::find_imp() (perl_matcher_common.hpp:263) ==25074== by 0x5810D0A: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::find() (perl_matcher_common.hpp:229) ==25074== by 0x4E85846: bool boost::regex_search<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost:::regex_traits<char, boost::cpp_regex_traits<char> > ::init(__gnu_cxx::__normal_iterator<char const*, std::string>) (regex_token_iterator.hpp:109) ==25074== by 0x4E8AC07: boost::regex_token_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > ::regex_token_iterator(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, int, boost::regex_constants::_match_flags) (regex_token_iterator.hpp:200) ==25074== ==25074== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 3 from 1) ==25074== malloc/free: in use at exit: 64,694 bytes in 500 blocks. ==25074== malloc/free: 590 allocs, 89 frees, 103,110 bytes allocated. ==25074== For counts of detected errors, rerun with: -v ==25074== searching for pointers to 500 not-freed blocks. ==25074== checked 402,856 bytes. ==25074== ==25074== LEAK SUMMARY: ==25074== definitely lost: 0 bytes in 0 blocks. ==25074== possibly lost: 7,480 bytes in 190 blocks. ==25074== still reachable: 57,214 bytes in 310 blocks. ==25074== suppressed: 0 bytes in 0 blocks. ==25074== Rerun with --leak-check=full to see details of leaked memory.