From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.bugs Subject: bug#33784: 27.0.50; some case c-backward-token-2 takes cpu more and emacs hang Date: 18 Dec 2018 17:47:16 -0000 Organization: muc.de e.V. Message-ID: <20181218174716.96822.qmail__42683.1734752797$1545155191$gmane$org@mail.muc.de> References: NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1545155191 7126 195.159.176.226 (18 Dec 2018 17:46:31 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 18 Dec 2018 17:46:31 +0000 (UTC) User-Agent: tin/2.4.2-20171224 ("Lochhead") (UNIX) (FreeBSD/11.2-RELEASE-p4 (amd64)) Cc: 33784@debbugs.gnu.org To: xh yang Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Dec 18 18:46:26 2018 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gZJRn-0001f0-FV for geb-bug-gnu-emacs@m.gmane.org; Tue, 18 Dec 2018 18:46:23 +0100 Original-Received: from localhost ([::1]:55584 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gZJTt-0003Ll-Tk for geb-bug-gnu-emacs@m.gmane.org; Tue, 18 Dec 2018 12:48:33 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:60553) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gZJTY-0003EU-9N for bug-gnu-emacs@gnu.org; Tue, 18 Dec 2018 12:48:15 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gZJTT-0004aI-Br for bug-gnu-emacs@gnu.org; Tue, 18 Dec 2018 12:48:09 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:49390) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gZJTP-0004WH-CW; Tue, 18 Dec 2018 12:48:03 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1gZJTP-0002t9-9v; Tue, 18 Dec 2018 12:48:03 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Alan Mackenzie Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org, bug-cc-mode@gnu.org Resent-Date: Tue, 18 Dec 2018 17:48:03 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 33784 X-GNU-PR-Package: emacs,cc-mode X-GNU-PR-Keywords: Original-Received: via spool by 33784-submit@debbugs.gnu.org id=B33784.154515524111045 (code B ref 33784); Tue, 18 Dec 2018 17:48:03 +0000 Original-Received: (at 33784) by debbugs.gnu.org; 18 Dec 2018 17:47:21 +0000 Original-Received: from localhost ([127.0.0.1]:53647 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gZJSj-0002s4-0d for submit@debbugs.gnu.org; Tue, 18 Dec 2018 12:47:21 -0500 Original-Received: from colin.muc.de ([193.149.48.1]:16595 helo=mail.muc.de) by debbugs.gnu.org with smtp (Exim 4.84_2) (envelope-from ) id 1gZJSh-0002ru-0D for 33784@debbugs.gnu.org; Tue, 18 Dec 2018 12:47:19 -0500 Original-Received: (qmail 96823 invoked by uid 3782); 18 Dec 2018 17:47:16 -0000 In-Reply-To: X-Newsgroups: gnu.emacs.bug X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 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" Xref: news.gmane.org gmane.emacs.bugs:153560 Archived-At: Hello, xh. In article you wrote: > [-- text/plain, encoding 7bit, charset: UTF-8, 117 lines --] > follow case: > (let ((str "#define SLOGE(...)\n > ((void)__android_log_buf_print(LOG_ID_SYSTEM, ANDROID_LOG_ERROR, LOG_TAG,\n > __VA_ARGS__))")) > (with-temp-buffer > (delay-mode-hooks (funcall 'c++-mode)) > (insert str) > (font-lock-ensure) > (buffer-string) > ) > ) > execute up code, emacs will hang Yes. The problem here is the (font-lock-ensure). This is being called even though font-lock-mode is disabled. I think there should be a check for this in font-lock-ensure, but there isn't. So, yes, we have a bug here. Thanks for taking the trouble to report it. Incidentally, the temporary buffer created by with-temp-buffer never has font-lock-mode enabled, and font-lock-mode is spiked so that it cannot be enabled in such a buffer. I don't know why. Attempting to enable it fails silently, which is probably another bug. Incidentally[2], the delay-mode-hooks in your recipe has nothing to do with the problem. > In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.18.9) > of 2018-12-18 built on xhyang-ThinkPad-T470p > Repository revision: 1691a51094d35ac4b2c311fa407c6b77eea7a105 > Repository branch: master > Windowing system distributor 'The X.Org Foundation', version 11.0.11906000 > System Description: Ubuntu 16.04.3 LTS [ .... ] -- Alan Mackenzie (Nuremberg, Germany).