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

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: Gerd Möllmann <gerd.moellmann@gmail.com>,
>  66744@debbugs.gnu.org
> Date: Thu, 26 Oct 2023 18:34:24 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Then maybe I don't understand what bothers you.  What are the "changes
> > made to the dump file in step 3" to which you allude?  AFRAIU, step 3
> > simply loads the dump file, it doesn't change the file.  What did I
> > miss?
> 
> step 1: create the dump file
> step 2: load Emacs with the created dump file
> step 3: repeat step 1 while Emacs is running -> running Emacs crashes
>      once I interact with its frame.
> 
> Hope it is more clear.

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"?