bug#66744: 30.0.50; Emacs crashes when re-dumping into the same dump file another Emacs instance is using

[Eli Zaretskii]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: Ihor Radchenko <yantar92@posteo.net>,  66744@debbugs.gnu.org
> Date: Thu, 26 Oct 2023 20:47:13 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Thanks, but no, it isn't.  Step 3 writes a new and different dump
> > file, doesn't it?  So how could those changes be "visible in the
> > mmaped dump file that Emacs from step 2 uses"?
> 
> Please see my mail, which is more precise: it's always the same file F.

Then it shouldn't be.  Each new dump should go to a new file, not to
the one we loaded in this session.  There's no reason to try to debug
the crash, since TRT is just "not to do that".