GNU bug report logs - #69459
30.0.50; temacs, SEGV while pdumping

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Package: emacs;

Reported by: Gerd Möllmann <gerd.moellmann <at> gmail.com>

Date: Wed, 28 Feb 2024 15:34:02 UTC

Severity: normal

Found in version 30.0.50

Fixed in version 30.1

Done: Gerd Möllmann <gerd.moellmann <at> gmail.com>

Bug is archived. No further changes may be made.

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Message #8 received at 69459 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: 69459 <at> debbugs.gnu.org
Subject: Re: bug#69459: 30.0.50; temacs, SEGV while pdumping
Date: Thu, 29 Feb 2024 05:21:40 +0100

Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:

> 1. While dumping, pdump creates new Lisp_Objects (hash-tables, conses, ...)
> that are stored in dump_context or subobjects of it, hash-tables for
> example.
>
> 2. I can't find a function that marks a struct dump_context for GC. If
> I'm right, nothing protects the objects that pdump creates from GC. 
>
> As a fix I propose to inhibit GC while pdumping. Would be nice if
> someone could check if (2) is right.

(2) is false: because ctx_buf is on the stack, stack scanning makes it
an ambiguous root.

So I'm closing this, because I haven't seen something like this SEGV in
an unmpdified Emacs.
This bug report was last modified 1 year and 138 days ago.

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