bug#41239: GTK builds crashing in XTread_socket after deleting a frame

[martin rudalics]

> Once again, all the crashes are inside memory-allocation functions,
> which suggests some kind of memory corruption.

But we can't exclude that this corruption happens in the GTK code, I
presume.

> Did someone try to run
> this scenario under valgrind?

I don't have it installed and never used it.  So I'm afraid that
someone else would have to chime in.

martin