GNU bug report logs - #12839
24.3.50; Emacs aborts in GC

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From: Dmitry Antipov <dmantipov <at> yandex.ru>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 12839 <at> debbugs.gnu.org
Subject: bug#12839: 24.3.50; Emacs aborts in GC
Date: Fri, 09 Nov 2012 17:27:54 +0400

On 11/09/2012 05:17 PM, Dmitry Antipov wrote:

> On 11/09/2012 11:24 AM, Eli Zaretskii wrote:
>
>> I'd be happy to try debugging this myself, but I need guidance
>> regarding some basics of what you changed recently in this area.
>> Alternatively, tell me what to do in GDB, and I will post the results.
>> I'm quite fluent with GDB, and reproducing this is extremely easy :-(.
>
> Try this:

And this, too:

=== modified file 'src/w32term.c'
--- src/w32term.c	2012-10-08 13:46:03 +0000
+++ src/w32term.c	2012-11-09 13:25:41 +0000
@@ -3626,7 +3626,7 @@
   HWND hwnd;
   SCROLLINFO si;
   struct scroll_bar *bar
-    = XSCROLL_BAR (Fmake_vector (make_number (SCROLL_BAR_VEC_SIZE), Qnil));
+    = XSCROLL_BAR (Fmake_vector (make_number (VECSIZE (struct scroll_bar))), Qnil);
   Lisp_Object barobj;

   block_input ();

=== modified file 'src/w32term.h'
--- src/w32term.h	2012-10-17 19:02:44 +0000
+++ src/w32term.h	2012-11-09 13:25:39 +0000
@@ -460,12 +460,6 @@
   Lisp_Object fringe_extended_p;
 };

-/* The number of elements a vector holding a struct scroll_bar needs.  */
-#define SCROLL_BAR_VEC_SIZE					\
-  ((sizeof (struct scroll_bar)					\
-    - sizeof (EMACS_INT) - sizeof (struct Lisp_Vector *))	\
-   / word_size)
-
 /* Turning a lisp vector value into a pointer to a struct scroll_bar.  */
 #define XSCROLL_BAR(vec) ((struct scroll_bar *) XVECTOR (vec))

Dmitry

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