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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.diffs,gmane.emacs.devel
Subject: Re: emacs-27 41232e6: Avoid crashes due to bidi cache being reset
 during redisplay
Date: Sun, 31 May 2020 18:12:53 +0300
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> From: Pip Cet <pipcet@gmail.com>
> Date: Sun, 31 May 2020 14:44:54 +0000
> Cc: emacs-diffs@gnu.org
> 
> > +  void *itdata = bidi_shelve_cache ();
> 
> But what if we're out of memory? bidi_shelve_cache will call xmalloc...

xmalloc calls memory_full if that happens.