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Crash in loadlocale()

I am porting a C++ app from Windows to OSX (10.6.8) and I'm getting a seemingly

thread related crash in std::ostream::operator<<(). The function loadlocale crashes with

Exception Type: EXC_BAD_ACCESS (SIGBUS)

Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000004


Any ideas why this might be happening?


Here are the relevant stack traces.


Thread 5 Crashed:

0 libSystem.B.dylib 0x9824ab85 __numeric_load_locale + 133

1 libSystem.B.dylib 0x98178599 loadlocale + 308

2 libstdc++.6.dylib 0x9aa14205 std::__convert_from_v(int* const&, char*, int, char const*, ...) + 143

3 libstdc++.6.dylib 0x9aa0db5e std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_float<double>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, char, double) const + 192

4 libstdc++.6.dylib 0x9aa0ddb4 std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, double) const + 64

5 libstdc++.6.dylib 0x9aa08583 std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, double) const + 59

6 libstdc++.6.dylib 0x9aa169dd std::ostream& std::ostream::_M_insert<double>(double) + 181

7 libstdc++.6.dylib 0x9aa16a76 std::ostream::operator<<(float) + 28

...


Thread 6:

0 libSystem.B.dylib 0x98148e0a open$NOCANCEL$UNIX2003 + 10

1 libSystem.B.dylib 0x9824b46b __part_load_locale + 204

2 libSystem.B.dylib 0x9824acf0 __numeric_load_locale + 496

3 libSystem.B.dylib 0x98178599 loadlocale + 308

4 libstdc++.6.dylib 0x9aa1423e std::__convert_from_v(int* const&, char*, int, char const*, ...) + 200

5 libstdc++.6.dylib 0x9aa0db5e std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_float<double>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, char, double) const + 192

6 libstdc++.6.dylib 0x9aa0ddb4 std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, double) const + 64

7 libstdc++.6.dylib 0x9aa08583 std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, double) const + 59

8 libstdc++.6.dylib 0x9aa169dd std::ostream& std::ostream::_M_insert<double>(double) + 181


Glenn

Posted on Nov 9, 2011 7:36 PM

Reply
2 replies

Oct 16, 2013 1:18 PM in response to glennra

A Google search led me to this discussion. I am encountering a similar problem under similar circumstances: I have C++ code that originated on Windows that I am trying to make run on the Mac. I am getting intermittent crashes in __numeric_load_locale, apparently when two separate threads try invoking std::ostream::operator <<(double) at the same time. (The call stacks above indicate that the original poster is also outputting a double value to a standard stream. In my case the stream in question is a std::wstringstream and we are trying to convert the double to a wide string.)


I believe, based largely on circumstantial evidence, that the crash is due to a bug in the GNU C++ library (libstdc++). I experimentally updated a version of my project to use the LLVM C++ library (libc++) and could not reproduce the crash. Unfortunately, my project is still targeting Snow Leopard, on which libc++ is not supported, so we are stuck with libstdc++ for the time being. As a workaround, I'm going to try protecting our string conversion function with a critical section (it's part of a custom logging package built on an open source JSON library) to avoid the problem.

Crash in loadlocale()

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