id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5911	Crash in Boost::regex when _GLIBCXX_DEBUG is defined	noloader@…	John Maddock	"Regex matching experiences a crash when _GLIBCXX_DEBUG is defined.

The crash was confirmed on multiple platforms, including Ubuntu, Fedora, and openBSD.

Full compiler command: g++ -D_GLIBCXX_DEBUG -DDEBUG=1 -g3 -ggdb -O0 regex-test.cpp -o regex-test.exe -lboost_regex

$ cat regex-test.cpp
#include <boost/regex.hpp>

int main(int, char**)
{
    const boost::regex re(""^[a-zA-Z]*"");
    bool match = boost::regex_match(""asdf"",re);

    return (int) !match;
}


$ ./regex-test.exe                                                             
Segmentation fault (core dumped) 
$ gdb ./regex-test.exe                                                         
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(gdb) r
Starting program: /home/jeffrey/Desktop/regex-test.exe 

Program received signal SIGSEGV, Segmentation fault.
0x01c6fc26 in __gnu_debug::_Safe_iterator_base::_M_detach_single (
    this=0x3c0000f9)
    at /usr/src/gnu/lib/libstdc++-v3/../../gcc/libstdc++-v3/src/debug.cc:242
242		  _M_prior->_M_next = _M_next;
(gdb) bt full
#0  0x01c6fc26 in __gnu_debug::_Safe_iterator_base::_M_detach_single (
    this=0x3c0000f9)
    at /usr/src/gnu/lib/libstdc++-v3/../../gcc/libstdc++-v3/src/debug.cc:242
No locals.
#1  0x01c710be in __gnu_debug::_Safe_sequence_base::_M_detach_all (
    this=0xcfbd3a60)
    at /usr/src/gnu/lib/libstdc++-v3/../../gcc/libstdc++-v3/src/debug.cc:118
	__iter = (__gnu_debug::_Safe_iterator_base *) 0x65707974
#2  0x1c00807b in ~_Safe_sequence_base (this=0xcfbd3a60) at safe_base.h:185
No locals.
#3  0x1c00808f in ~_Safe_sequence (this=0xcfbd3a60) at safe_sequence.h:103
No locals.
#4  0x1c0080a9 in ~vector (this=0xcfbd3a54) at vector:101
No locals.
#5  0x1c008194 in ~match_results (this=0xcfbd3a54) at match_results.hpp:103
No locals.
#6  0x1c008655 in boost::regex_match<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > (str=0x3c0000f9 ""asdf"", e=@0xcfbd3ac4, 
    flags=boost::regex_constants::match_default) at regex_match.hpp:90
	m = {
  m_subs = {<std::__norm::vector<boost::sub_match<const char*>,std::allocator<boost::sub_match<const char*> > >> = {<std::__norm::_Vector_base<boost::sub_match<const char*>,std::allocator<boost::sub_match<const char*> > >> = {
        _M_impl = {<std::allocator<boost::sub_match<const char*> >> = {<__gnu_cxx::new_allocator<boost::sub_match<const char*> >> = {<No data fields>}, <No data fields>}, _M_start = 0x88c4f100, _M_finish = 0x88c4f124, 
          _M_end_of_storage = 0x88c4f124}}, <No data fields>}, <__gnu_debug::_Safe_sequence<std::__debug::vector<boost::sub_match<const char*>, std::allocator<boost::sub_match<const char*> > > >> = {<__gnu_debug::_Safe_sequence_base> = {
        _M_iterators = 0x3c0000f9, _M_const_iterators = 0x0, 
        _M_version = 1}, <No data fields>}, _M_guaranteed_capacity = 0}, 
  m_base = 0x85509400 ""x\177�'"", 
  m_null = {<std::pair<const char*,const char*>> = {first = 0x3c0000fd """", 
      second = 0x3c0000fd """"}, matched = false}, m_named_subs = {px = 0x0, 
    pn = {pi_ = 0x0}}, m_last_closed_paren = 0, m_is_singular = false}
#7  0x1c005324 in main () at regex-test.cpp:8
	re = {<boost::regbase> = {<No data fields>}, m_pimpl = {
    px = 0x85509400, pn = {pi_ = 0x8ab55140}}}
	match = 28
(gdb)"	Bugs	closed	To Be Determined	regex	Boost 1.47.0	Problem	wontfix	regex match crash