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

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  Alan Third <alan@idiocy.org>,
>   58042@debbugs.gnu.org
> Date: Wed, 05 Oct 2022 19:23:53 +0800
> 
> >> +  if (w->next)
> >> +    mark_window (w->next);
> >> +
> >>    /* Filter out killed buffers from both buffer lists
> >>       in attempt to help GC to reclaim killed buffers faster.
> >>       We can do it elsewhere for live windows, but this is the
> >
> > Indeed, that seems to work!
> 
> Right.  I've not had the time to investigate why unmarked windows remain
> in the window tree

Maybe those windows were deleted?