Hello.

On Wed, Mar 23, 2016 at 12:50 PM, Goswin von Brederlow <goswin-v-b@web.de>
wrote:

> I'm stuck with a bug in the Tetrix example for my QT5 bindings:
>
>   https://github.com/mrvn/ocaml-qt5
>
> The segfault happens when you click start and the first piece is moved
> one tile down in caml_mrvn_QT5_OPainter_fillRect. The arguments to the
> call all look ok but something must corrupt the painter. The segfault
> goes away when I force a Gc.full_major before creating a new OPainter
> in TetrixBoard:148.
>

Just a wild guess: there are a lot of raw c++ pointer casts to ocaml values
in the code, and to quote
http://caml.inria.fr/pub/docs/manual-ocaml/intfc.html#sec424 "this can
crash the garbage collector" in some non-obvious circumstances.