Segfault if you save() without doing build()

[a1k0n]

It's a PEBKAC error but it's sort of user unfriendly.

Program received signal SIGSEGV, Segmentation fault.
*__GI___libc_free (mem=0x7fff7974d000) at malloc.c:3710
3710    malloc.c: No such file or directory.
        in malloc.c
(gdb) where
#0  *__GI___libc_free (mem=0x7fff7974d000) at malloc.c:3710
#1  0x00007fffefff95bc in AnnoyIndexPython<float, Angular<float> >::save_py(std::string const&) () from /usr/lib/pymodules/python2.6/annoy/annoylib.so
#2  0x00007fffefff44b7 in boost::python::objects::caller_py_function_impl<boost::python::detail::caller<void (AnnoyIndexPython<float, Angular<float> >::*)(std::string const&), boost::python::default_call_policies, boost::mpl::vector3<void, AnnoyIndexPython<float, Angular<float> >&, std::string const&> > >::operator()(_object*, _object*) ()
   from /usr/lib/pymodules/python2.6/annoy/annoylib.so
#3  0x00007fffefdb7bde in boost::python::objects::function::call(_object*, _object*) const () from /usr/lib/libboost_python-py26.so.1.42.0
#4  0x00007fffefdb7e88 in ?? () from /usr/lib/libboost_python-py26.so.1.42.0
#5  0x00007fffefdbf703 in boost::python::detail::exception_handler::operator()(boost::function0<void> const&) const () from /usr/lib/libboost_python-py26.so.1.42.0
#6  0x00007fffefff2c67 in boost::detail::function::function_obj_invoker2<boost::_bi::bind_t<bool, boost::python::detail::translate_exception<ErrnoException, void (*)(ErrnoException const&)>, boost::_bi::list3<boost::arg<1>, boost::arg<2>, boost::_bi::value<void (*)(ErrnoException const&)> > >, bool, boost::python::detail::exception_handler const&, boost::function0<void> const&>::invoke(boost::detail::function::function_buffer&, boost::python::detail::exception_handler const&, boost::function0<void> const&) ()
   from /usr/lib/pymodules/python2.6/annoy/annoylib.so
#7  0x00007fffefdbf4d3 in boost::python::handle_exception_impl(boost::function0<void>) () from /usr/lib/libboost_python-py26.so.1.42.0
#8  0x00007fffefdb4788 in ?? () from /usr/lib/libboost_python-py26.so.1.42.0
#9  0x000000000041f117 in PyObject_Call ()
#10 0x00000000004a74e8 in PyEval_EvalFrameEx ()
#11 0x00000000004a97f1 in PyEval_EvalCodeEx ()
#12 0x00000000004a98c2 in PyEval_EvalCode ()
#13 0x00000000004c9aee in PyRun_FileExFlags ()
#14 0x00000000004c9d04 in PyRun_SimpleFileExFlags ()
#15 0x000000000041a89d in Py_Main ()
#16 0x00007ffff69e7cad in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>,
    fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fffffffe158) at libc-start.c:228
#17 0x0000000000419a99 in _start ()

[a1k0n]

I also just realized I was running .save() on a tree that I had previously .load()ed, not the one I was trying to save. So, different problem.