OS X 10.6 and later have a very aggressive memory allocator in them -
it is superbly quick, but it's still quite young code.
If your BPL example runs under valgrind on Linux fine - and I would
suspect that it does - it'll be a bug in either OS X or Apple's port
of GCC to OS X (which would hardly be the first time).
If it does trip on valgrind on Linux you'll get a much more
enthusiastic response here.
Niall
On 26 Oct 2011 at 21:38, Jakob van Santen wrote:
> Hi all,
>
> I've run across what I think is a strange memory corruption bug affecting
> C++/Python exception translation on OS X 10.7. A short program that
> reproduces the bug follows:
>
> #include <boost/python.hpp>
>
> static void
> throwme() { throw std::invalid_argument("Bork!"); }
>
> struct Bork {
> void throwy() { throwme(); }
> };
>
> #ifdef BORKED
> BOOST_PYTHON_MODULE(borked)
> {
> boost::python::class_<Bork>("Bork")
> .def("throwy", &Bork::throwy)
> ;
> #else
> BOOST_PYTHON_MODULE(good)
> {
> #endif
> boost::python::def("throwy", &throwme);
> }
>
> When compiled without the call to class_<Bork>::def(), the exception is
> caught in handle_exception_impl() and presented to Python as ValueError, as
> expected:
>
> [jakob@i3-dhcp-172-16-55-176:tmp/pybork]$ python -c "import good;
> good.throwy()"
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> ValueError: Bork!
>
> When compiled with -DBORKED, however, I get a bad free() inside the
> std::logic_error destructor:
>
> [jakob@i3-dhcp-172-16-55-176:tmp/pybork]$ python -c "import borked;
> borked.throwy()"
> python(77633) malloc: *** error for object 0x7fec22c735a4: pointer being
> freed was not allocated
> *** set a breakpoint in malloc_error_break to debug
>
> I first encountered this bug in a private fork of 1.38, but I can reproduce
> it with a freshly build copy of 1.47. It occurs when building with both
> llvm-gcc and gcc-gcc, regardless of the optimization level. I built the two
> test libraries like so:
>
> g++ bork.cxx -g -bundle -flat_namespace -undefined dynamic_lookup
> -Iboost/include -I/System/Library/Frameworks/Python.framework/Headers/
> -Lboost/lib -lboost_python -DBORKED -o borked.so
> g++ bork.cxx -g -bundle -flat_namespace -undefined dynamic_lookup
> -Iboost/include -I/System/Library/Frameworks/Python.framework/Headers/
> -Lboost/lib -lboost_python -o good.so
>
> Can anyone reproduce this?
>
> Cheers,
> Jakob
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