From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Dan Nicolaescu Newsgroups: gmane.emacs.bugs Subject: bug#10164: 24.0.91; Instant crash enabling linum-mode Date: Wed, 30 Nov 2011 07:52:40 -0500 Message-ID: References: <4ED58F60.4000604@code-affinity.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: dough.gmane.org 1322657589 21893 80.91.229.12 (30 Nov 2011 12:53:09 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 30 Nov 2011 12:53:09 +0000 (UTC) Cc: 10164@debbugs.gnu.org, Tim Crews To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Nov 30 13:53:04 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 1RVjep-0005Ij-Rr for geb-bug-gnu-emacs@m.gmane.org; Wed, 30 Nov 2011 13:53:03 +0100 Original-Received: from localhost ([::1]:60226 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RVjep-0002UP-1Z for geb-bug-gnu-emacs@m.gmane.org; Wed, 30 Nov 2011 07:53:03 -0500 Original-Received: from eggs.gnu.org ([140.186.70.92]:45071) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RVjem-0002UE-45 for bug-gnu-emacs@gnu.org; Wed, 30 Nov 2011 07:53:01 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RVjek-0004z7-Vs for bug-gnu-emacs@gnu.org; Wed, 30 Nov 2011 07:53:00 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:45217) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RVjek-0004z1-UV for bug-gnu-emacs@gnu.org; Wed, 30 Nov 2011 07:52:58 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.69) (envelope-from ) id 1RVjen-0006nZ-Hs for bug-gnu-emacs@gnu.org; Wed, 30 Nov 2011 07:53:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Dan Nicolaescu Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 30 Nov 2011 12:53:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 10164 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 10164-submit@debbugs.gnu.org id=B10164.132265756826112 (code B ref 10164); Wed, 30 Nov 2011 12:53:01 +0000 Original-Received: (at 10164) by debbugs.gnu.org; 30 Nov 2011 12:52:48 +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 1RVjea-0006n7-0q for submit@debbugs.gnu.org; Wed, 30 Nov 2011 07:52:48 -0500 Original-Received: from fencepost.gnu.org ([140.186.70.10]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1RVjeY-0006n0-61 for 10164@debbugs.gnu.org; Wed, 30 Nov 2011 07:52:46 -0500 Original-Received: from dann by fencepost.gnu.org with local (Exim 4.71) (envelope-from ) id 1RVjeS-00026Z-PX; Wed, 30 Nov 2011 07:52:40 -0500 In-Reply-To: (Eli Zaretskii's message of "Wed, 30 Nov 2011 07:19:56 -0500") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list Resent-Date: Wed, 30 Nov 2011 07:53:01 -0500 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) 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:54473 Archived-At: Eli Zaretskii writes: >> Date: Tue, 29 Nov 2011 19:05:20 -0700 >> From: Tim Crews >> >> Start Emacs with runemacs -Q --no-init-file >> C-x C-f foo.txt >> M-x linum-mode >> (Emacs doesn't crash yet) >> Type anything. Emacs instantly crashes. > > Arrgh! This is GCC 4.6.x "as-is" code reordering in action. Emacs > crashes here: > > xassert (!row->enabled_p > || row->mode_line_p > || verify_row_hash (row)); > > Evidently, it calls verify_row_hash before it tests row->mode_line_p. Are you sure? Without interprocedural analysis the compiler cannot know that `verify_row_hash' does not alter row->enabled_p, so it cannot change the evaluation order. BTW, the argument for row_hash should be const.