bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal

[Gerd Möllmann]

On 22-10-05 15:27 , Eli Zaretskii wrote:
> > From: Gerd Möllmann <gerd.moellmann@gmail.com>
> > Cc: Eli Zaretskii <eliz@gnu.org>,  58042@debbugs.gnu.org,  Alan Third
> >   <alan@idiocy.org>
> > Date: Wed, 05 Oct 2022 13:10:03 +0200
> >
> > Can somone please help me understand how this works?
> >
> > Let's say we are in memq called for list L.  Fmemq uses FOR_EACH_TAIL,
> > which can call maybe_quit, which executes arbitrary Lisp, which can
> > modify L.
>
> "Arbitrary Lisp" being redisplay that calls various hooks, like
> window-configuration-change-hook etc.?  IOW, this is a macOS only
> thing?

I don't know.  What Po Lu said sounded to me like it isn't specific to 
macOS (safe_call in event handlers, IIRC).