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bug#34206: Pdumper giving a segfault


From: Daniel Colascione
Subject: bug#34206: Pdumper giving a segfault
Date: Sat, 26 Jan 2019 19:50:17 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

On 1/26/19 2:49 AM, Eli Zaretskii wrote:
From: Compro Prasad <address@hidden>
Date: Sat, 26 Jan 2019 14:33:57 +0530
Cc: address@hidden

GDB log: https://pastebin.com/2uMPHCRV

This seems to indicate your configuration is quite complex, and I
cannot easily understand what are you doing that is different from
the normal build and "emacs -Q" to start Emacs.  In particular, this:

   $ gdb ./src/emacs-27.0.50.11
   Reading symbols from ./src/emacs-27.0.50.11...done.
   (gdb) r --dump-file="/home/compro/.emacs.d/.cache/dumps/spacemacs.pdmp"
   Starting program: 
/home/compro/Downloads/git.savannah.gnu.org/git/emacs/src/emacs-27.0.50.11 
--dump-file="/home/compro/.emacs.d/.cache/dumps/spacemacs.pdmp"

indicates that your pdump file is spacemacs.pdmp, but I don't know how
that file was produced, and I cannot easily understand what is
different in your build procedure from the normal upstream build of
Emacs.
I don't know if you can help me but I have some more information on
how the dump might be produced.

https://github.com/Compro-Prasad/spacemacs/blob/pdumper-is-in-master/core/core-dumper.el#L68

I don't think this helps much, as I don't really know anything about
spacemacs and its build procedures.

I went a bit further and tried executing the following using `C-x C-e`
while running spacemacs:

    (dump-emacs-portable "~/test.pdmp")

It gave me: eval: unsupported object type in dump: window configuration

Is this a bug or I am supposed to run Emacs in batch mode while dumping?

Yes, dump-emacs-portable can only be invoked in batch mode.

That's not quite true. There's no particular reason it can't be invoked in any mode, but as the message indicates, there are some objects that pdumper doesn't know how to dump. Packages maintaining these objects should add-function to dump-emacs-portable to temporarily make these objects disappear while a dump is in progress.

In any case, neither the dump nor load should actually segfault. A segfault is a bug.





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