Trying out the pdump feature I noticed that it consistently segfaults on
my Gentoo machine when dbus was used prior to dumping as soon as dbus is
used in the emacs session created from the pdump. This did not happen on
a Ubuntu 18.04 or Debian Buster machine.

The bug can be reproduced by preparing a
% cat debug-init.el                                                                                                                                                            ~
(require 'dbus)
(message
        "%s screensaver on board."
        (cond
                ((dbus-ping :session "org.gnome.ScreenSaver" 100) "Gnome")
                ((dbus-ping :session "org.freedesktop.ScreenSaver" 100) "KDE")
                (t "No")))

Running the following to dump

  emacs --batch -Q -l debug-init.el -eval '(dump-emacs-portable "/home/leonard/.emacs.d/.cache/dumps/spacemacs.pdmp")'

Starting from the dumped file

  emacs -Q --dump-file=/home/leonard/.emacs.d/.cache/dumps/spacemacs.pdmp 

And finally executing the exemplar dbus command in the now running emacs session:


    (require 'dbus)
    (message
            "%s screensaver on board."
            (cond
                    ((dbus-ping :session "org.gnome.ScreenSaver" 100) "Gnome")
                    ((dbus-ping :session "org.freedesktop.ScreenSaver" 100) "KDE")
                    (t "No")))


I'm attaching gdb output of the backtraces. Please let me know if you
would like to see any further information.

Output of "bt":