From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Phil Sainty Newsgroups: gmane.emacs.bugs Subject: bug#10047: Looking for help debugging an undo issue Date: Mon, 28 Nov 2011 23:49:24 +1300 Message-ID: <4ED36734.5060608@orcon.net.nz> References: <4EC0F2F3.5000607@orcon.net.nz> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1322477418 10880 80.91.229.12 (28 Nov 2011 10:50:18 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Mon, 28 Nov 2011 10:50:18 +0000 (UTC) Cc: 10047@debbugs.gnu.org To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Mon Nov 28 11:50:14 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 1RUymr-0004He-HS for geb-bug-gnu-emacs@m.gmane.org; Mon, 28 Nov 2011 11:50:13 +0100 Original-Received: from localhost ([::1]:47209 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RUymr-0005bP-2M for geb-bug-gnu-emacs@m.gmane.org; Mon, 28 Nov 2011 05:50:13 -0500 Original-Received: from eggs.gnu.org ([140.186.70.92]:42894) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RUymo-0005ao-4g for bug-gnu-emacs@gnu.org; Mon, 28 Nov 2011 05:50:11 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RUymn-0006Mj-9Q for bug-gnu-emacs@gnu.org; Mon, 28 Nov 2011 05:50:10 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:40455) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RUymn-0006MW-7z for bug-gnu-emacs@gnu.org; Mon, 28 Nov 2011 05:50:09 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.69) (envelope-from ) id 1RUyoc-0006ME-4f for bug-gnu-emacs@gnu.org; Mon, 28 Nov 2011 05:52:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Phil Sainty Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 28 Nov 2011 10:52:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 10047 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: moreinfo Original-Received: via spool by 10047-submit@debbugs.gnu.org id=B10047.132247749024400 (code B ref 10047); Mon, 28 Nov 2011 10:52:02 +0000 Original-Received: (at 10047) by debbugs.gnu.org; 28 Nov 2011 10:51:30 +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 1RUyo5-0006LT-59 for submit@debbugs.gnu.org; Mon, 28 Nov 2011 05:51:30 -0500 Original-Received: from loadbalancer1.orcon.net.nz ([219.88.242.3] helo=mx1.orcon.net.nz) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1RUyo1-0006LI-DJ for 10047@debbugs.gnu.org; Mon, 28 Nov 2011 05:51:27 -0500 Original-Received: from Debian-exim by mx1.orcon.net.nz with local (Exim 4.69) (envelope-from ) id 1RUymS-0003dX-Ue for 10047@debbugs.gnu.org; Mon, 28 Nov 2011 23:49:48 +1300 Original-Received: from [60.234.157.21] (helo=[192.168.1.2]) by mx1.orcon.net.nz with esmtpa (Exim 4.69) (envelope-from ) id 1RUymS-0003cR-JB; Mon, 28 Nov 2011 23:49:48 +1300 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:8.0) Gecko/20111105 Thunderbird/8.0 In-Reply-To: X-DSPAM-Check: by mx1.orcon.net.nz on Mon, 28 Nov 2011 23:49:48 +1300 X-DSPAM-Result: Spam X-DSPAM-Processed: Mon Nov 28 23:49:48 2011 X-DSPAM-Confidence: 0.5199 X-DSPAM-Probability: 1.0000 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list Resent-Date: Mon, 28 Nov 2011 05:52:02 -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:54351 Archived-At: > Your problem doesn't ring a bell, sorry. The best options I can think > of are: > - log the value of buffer-undo-list at each step in some auxiliary > debugging buffer, for post-mortem analysis. > - try to come up with a reproducible test case. As it turned out, most of my code & context was irrelevant. You should be able to reproduce the bug like this: emacs -Q M-: (add-hook 'post-command-hook 'align-current) RET (until the scratch buffer message is gone) C-/ (or otherwise undo, until it fails with the message "No further undo information") It will probably occur after deleting far fewer characters than that, but the point of failure seems variable. However, in a half-dozen test runs just now, I've yet to have it get as far as restoring the first half of the first line before failing. -Phil