From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Chong Yidong Newsgroups: gmane.emacs.bugs Subject: bug#9401: 24.0.50; Crash during fontification Date: Tue, 30 Aug 2011 18:45:34 -0400 Message-ID: <87mxeq8qnl.fsf@stupidchicken.com> References: <87obz8i4gr.fsf@stupidchicken.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: dough.gmane.org 1314744362 26051 80.91.229.12 (30 Aug 2011 22:46:02 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Tue, 30 Aug 2011 22:46:02 +0000 (UTC) To: 9401@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Aug 31 00:45:59 2011 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([140.186.70.17]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1QyX49-0001RN-3v for geb-bug-gnu-emacs@m.gmane.org; Wed, 31 Aug 2011 00:45:57 +0200 Original-Received: from localhost ([::1]:52628 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QyX48-00034Q-E8 for geb-bug-gnu-emacs@m.gmane.org; Tue, 30 Aug 2011 18:45:56 -0400 Original-Received: from eggs.gnu.org ([140.186.70.92]:49474) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QyX45-0002w5-Kj for bug-gnu-emacs@gnu.org; Tue, 30 Aug 2011 18:45:54 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QyX44-0006B0-DQ for bug-gnu-emacs@gnu.org; Tue, 30 Aug 2011 18:45:53 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:44991) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QyX44-0006Aw-Bo for bug-gnu-emacs@gnu.org; Tue, 30 Aug 2011 18:45:52 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.69) (envelope-from ) id 1QyX77-0002rQ-HG; Tue, 30 Aug 2011 18:49:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Chong Yidong Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-To: owner@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 30 Aug 2011 22:49:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 9401 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 9401-submit@debbugs.gnu.org id=B9401.131474452810964 (code B ref 9401); Tue, 30 Aug 2011 22:49:01 +0000 Original-Received: (at 9401) by debbugs.gnu.org; 30 Aug 2011 22:48:48 +0000 Original-Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1QyX6t-0002qm-RL for submit@debbugs.gnu.org; Tue, 30 Aug 2011 18:48:48 -0400 Original-Received: from vm-emlprdomr-02.its.yale.edu ([130.132.50.143]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1QyX6r-0002qe-JM for 9401@debbugs.gnu.org; Tue, 30 Aug 2011 18:48:46 -0400 Original-Received: from furball ([128.36.14.41]) (authenticated bits=0) by vm-emlprdomr-02.its.yale.edu (8.14.4/8.14.4) with ESMTP id p7UMjY5e021282 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT) for <9401@debbugs.gnu.org>; Tue, 30 Aug 2011 18:45:35 -0400 In-Reply-To: <87obz8i4gr.fsf@stupidchicken.com> (Chong Yidong's message of "Mon, 29 Aug 2011 12:10:12 -0400") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) X-Scanned-By: MIMEDefang 2.71 on 130.132.50.143 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list Resent-Date: Tue, 30 Aug 2011 18:49:01 -0400 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 1) X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:50456 Archived-At: Chong Yidong writes: > I can trigger this crash about 50 percent of the time by doing > > emacs -q trunk/src/buffer.h > C-s defvar > > Emacs then crashes with a segfault. > > The problem involves a call to scan_sexps_forward (frame#4) with > from_byte larger than the byte size of the buffer. I've found the bug, and committed a fix. It was a problem with find_defun_start not updating its cache variables consistently. (Is that optimization really necessary? I guess we can re-examine it some other time.)