id summary reporter owner description type status milestone component version severity resolution keywords cc 3460 Index out-of-bounds in match_regex with _GLIBCXX_DEBUG Bart Janssens John Maddock "Compiling a program that uses match_regex using the -D_GLIBCXX_DEBUG results in an error indicating that an index was out of bounds. Compile the attached testcase with: {{{ g++ -g -O1 -D_GLIBCXX_DEBUG -lboost_regex -o regex regex.cpp }}} Running it displays the following error: {{{ /usr/include/c++/4.3/debug/vector:237:error: attempt to subscript container with out-of-bounds index 2, but container only holds 2 elements. Objects involved in the operation: sequence ""this"" @ 0x0x7fff918bfa40 { type = NSt7__debug6vectorIN5boost9sub_matchIN9__gnu_cxx17__normal_iteratorIPKcSsEEEESaIS8_EEE; } Aborted }}} A backtrace of this says: {{{ #0 0x00007fead68e6fb5 in raise () from /lib/libc.so.6 #1 0x00007fead68e8bc3 in abort () from /lib/libc.so.6 #2 0x00007fead712587c in __gnu_debug::_Error_formatter::_M_error () from /usr/lib/libstdc++.so.6 #3 0x0000000000408638 in std::__debug::vector >, std::allocator > > >::operator[] (this=0x7fffdf8e8a50, __n=2) at /usr/include/c++/4.3/debug/vector:237 #4 0x00000000004104d5 in boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator, std::allocator > >, boost::regex_traits > >::match_prefix (this=0x7fffdf8e6eb0) at /usr/local/include/boost/regex/v4/match_results.hpp:418 #5 0x0000000000410899 in boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator, std::allocator > >, boost::regex_traits > >::match_imp (this=0x7fffdf8e6eb0) at /usr/local/include/boost/regex/v4/perl_matcher_common.hpp:207 #6 0x0000000000410b5d in boost::regex_match<__gnu_cxx::__normal_iterator, std::allocator > >, char, boost::regex_traits > > (first=, last=, m=, e=, flags=) at /usr/local/include/boost/regex/v4/perl_matcher_common.hpp:180 #7 0x0000000000405d7c in main () at /usr/local/include/boost/regex/v4/regex_match.hpp:100 }}} It appears that m_subs[2] is used in line 418 of match_results.hpp, but the size of m_subs is only 2. Compiling without -D_GLIBCXX_DEBUG allows the program to run, and valgrind does not detect any errors. I have tested this on the following platforms: {{{ Linux 2.6.28-15-generic #49-Ubuntu SMP Tue Aug 18 19:25:34 UTC 2009 x86_64 GNU/Linux with g++ (Ubuntu 4.3.3-5ubuntu4) 4.3.3 (Ubuntu Jaunty) }}} and {{{ Linux 2.6.31-9-generic #29-Ubuntu SMP Sun Aug 30 17:39:23 UTC 2009 i686 GNU/Linux with g++ (Ubuntu 4.4.1-4ubuntu1) 4.4.1 (Ubuntu Karmic) }}} On Ubuntu Hardy with boost 1.34.1, the problem does not appear." Bugs closed Boost 1.41.0 regex Boost 1.40.0 Problem invalid match_regex m_subs