bug#58334: 29.0.50; ASAN heap use after free in gui_produce_glyphs

[Gerd Möllmann]

Eli Zaretskii <eliz@gnu.org> writes:

> If you are thinking about expose_frame and friends, then that was
> changed years ago not to run from the signal handler, so it cannot
> cause any problems to code that modifies the glyph matrices.

Again what learned.  I was indeed thinking of that.  Thanks.