Using boost 1.40 and gcc 4.3.4 (same problem occurs with gcc 4.4.2) I have the following problem. After compiling the attached python module with the command g++ -shared -fPIC -o kernel.so python.cc box.cc -lboost_python -I/usr/include/python2.5 and executing python run.py I get the error message *** glibc detected *** python: free(): invalid next size (fast): 0x0000000001a32a30 *** This error does not occur when the macro _GLIBCXX_DEBUG is not being defined. It also does not occur when the contents of python.cc and box.cc are put into one file. In more complicated programs defining _GLIBCXX_DEBUG can lead to a "Segmentation fault". Not defining _GLIBCXX_DEBUG also helps there. Is there a way to deal with this short of not defining _GLIBCXX_DEBUG? Could it be a bug in Boost.Python? Thanks in advance, Christoph here are the files: file python.cc: **************************************************************** #include <boost/python.hpp> #define _GLIBCXX_DEBUG #include <vector> #include "box.hh" using namespace boost::python; BOOST_PYTHON_MODULE(kernel) { class_<Box>("Box", init<> ()) ; } **************************************************************** file box.cc **************************************************************** #define _GLIBCXX_DEBUG #include "box.hh" Box::Box() { } **************************************************************** file box.hh **************************************************************** #ifndef BOX_HH #define BOX_HH #include <vector> class Box { public: Box(); private: std::vector<int> blocks; }; #endif // BOX_HH **************************************************************** file run.py **************************************************************** #!/usr/bin/env python import kernel sys = kernel.Box() ****************************************************************