From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#44818: 27.0.91; wedged Date: Mon, 23 Nov 2020 17:51:55 +0200 Message-ID: <83a6v8vzok.fsf@gnu.org> References: Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="17773"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 44818@debbugs.gnu.org To: Devon Sean McCullough Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Nov 23 16:53:09 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1khE9N-0004Sf-CX for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 23 Nov 2020 16:53:09 +0100 Original-Received: from localhost ([::1]:45788 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1khE9M-00049j-4l for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 23 Nov 2020 10:53:08 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35268) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1khE9G-00049V-2B for bug-gnu-emacs@gnu.org; Mon, 23 Nov 2020 10:53:02 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:39203) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1khE9F-000322-Ql for bug-gnu-emacs@gnu.org; Mon, 23 Nov 2020 10:53:01 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1khE9F-0004XW-OZ for bug-gnu-emacs@gnu.org; Mon, 23 Nov 2020 10:53:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 23 Nov 2020 15:53:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 44818 X-GNU-PR-Package: emacs Original-Received: via spool by 44818-submit@debbugs.gnu.org id=B44818.160614672817385 (code B ref 44818); Mon, 23 Nov 2020 15:53:01 +0000 Original-Received: (at 44818) by debbugs.gnu.org; 23 Nov 2020 15:52:08 +0000 Original-Received: from localhost ([127.0.0.1]:50749 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1khE8O-0004WL-Gs for submit@debbugs.gnu.org; Mon, 23 Nov 2020 10:52:08 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:44864) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1khE8M-0004Vv-Mq for 44818@debbugs.gnu.org; Mon, 23 Nov 2020 10:52:07 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:46366) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1khE8H-0002hL-3R; Mon, 23 Nov 2020 10:52:01 -0500 Original-Received: from [176.228.60.248] (port=3194 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1khE8G-0004II-12; Mon, 23 Nov 2020 10:52:00 -0500 In-Reply-To: (message from Devon Sean McCullough on Mon, 23 Nov 2020 00:07:10 -0500) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list 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-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:193923 Archived-At: > From: Devon Sean McCullough > Date: Mon, 23 Nov 2020 00:07:10 -0500 > > Having fat-fingered it in dired, I inadvertently opened a large file > with no newlines. That Emacs instance has been burning 100% CPU all > day. I can interrupt and single step it in llbd from another Emacs. > Is there any way to unwedge Emacs? E.g., would forcing read_char to > return Qnil, Qt or something cause corruption? Would invoking, say, > Fbury_buffer_internal (Fcurrent_buffer ()) regain control or blow it > up? I'll leave it overnight in case it reads the ^G^G^Xk^M I typed. Try this: C-g M-< This will probably take some time to come through, but once it does, you will see the very beginning of the file, and should be able to kill the buffer with "C-x k RET". > P.S. Obviously, long stretches of non-newlines wedge Emacs for ages, > because redisplay assumes there are no long lines. Perhaps the docs > mention some workaround I missed? Redisplay has been buggy for over > a year now, glitchy blank windows, etc., but that's not today's bug. When you visit such a long file in Emacs 27.1, you should see a suggestion to visit it literally; take it. A more general solution is to turn on so-long mode. You seem to be running a pretest of Emacs 27.1, so maybe these don't work in your version.