GNU bug report logs - #18180
24.3.92; Segfault in mark_object

Previous Next

Full log

Message #20 received at 18180 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Antipov <dmantipov <at> yandex.ru>
To: Mat Smiglarski <penthief <at> SDF.ORG>
Cc: 18180 <at> debbugs.gnu.org
Subject: Re: bug#18180: 24.3.92; Segfault in mark_object
Date: Mon, 04 Aug 2014 13:15:32 +0400

On 08/04/2014 10:46 AM, Mat Smiglarski wrote:

> I have not been able to reproduce this by automating the calls to stress-speed-read.

Reproduced with (dotimes (i 100) (stress-speed-read (current-buffer)))).

Ugh, it seems that we never initialize undo-list of indirect buffer.  You can use
this trivial fix just to avoid crash:

=== modified file 'src/buffer.c'
--- src/buffer.c	2014-07-27 13:21:30 +0000
+++ src/buffer.c	2014-08-04 09:06:08 +0000
@@ -825,6 +825,7 @@
   name = Fcopy_sequence (name);
   set_string_intervals (name, NULL);
   bset_name (b, name);
+  bset_undo_list (b, BVAR (b->base_buffer, undo_list));

   reset_buffer (b);
   reset_buffer_local_variables (b, 1);

But this bug raises an interesting question: should an indirect buffer's undo list
be always the same as the one of its base buffer?

Dmitry

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.