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

[Gerd Möllmann]

Ihor Radchenko <yantar92@posteo.net> writes:

> Steps to reproduce:
>
> 1. ./src/emacs -Q --batch -l ~/Downloads/dump.el 
>
> ---- dump.el -----
> (dump-emacs-portable "/tmp/emacs-dumped.dmp")
> ---------------
>
> 2. ./src/emacs -Q --dump-file="/tmp/emacs-dumped.dmp"

I wasn't yet able to reproduce this here, on macOS.

The stack trace says it's during mouse-highlighting, so chances are it's
not related to the dump in step 3. What happens when you leave out step
3, and just try some mouse-highligting in the Emacs from step 2?