GNU bug report logs - #14666
24.3.50; emacs_backtrace.txt

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Package: emacs;

Reported by: Drew Adams <drew.adams <at> oracle.com>

Date: Wed, 19 Jun 2013 15:05:02 UTC

Severity: normal

Tags: moreinfo

Merged with 14669

Found in version 24.3.50

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: lekktu <at> gmail.com
Cc: 14666 <at> debbugs.gnu.org
Subject: bug#14666: 24.3.50; emacs_backtrace.txt
Date: Wed, 19 Jun 2013 19:47:23 +0300

> Date: Wed, 19 Jun 2013 19:10:26 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 14666 <at> debbugs.gnu.org
> 
>   LISP_INLINE struct buffer *
>   XBUFFER (Lisp_Object a)
>   {
>     eassert (BUFFERP (a));
>     return XUNTAG (a, Lisp_Vectorlike);  <<<<<<<<<<<<<<<
>   }
> 
> I don't see how XUNTAG can crash, so the only possible cause that's
> left is the assertion before that.  But how can the assertion be
> false, when line 3189 of w32fns.c is only executed if w->contents _is_
> a buffer?

The only explanation is that another thread modified w->contents after
it was tested with BUFFERP.
This bug report was last modified 11 years and 110 days ago.

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