From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: William Rankin Newsgroups: gmane.emacs.bugs Subject: bug#39967: 27.0.90; how to debug point moving erratically? 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Fri, 6 Mar 2020 22:49:37 -0500 (EST) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Mailman-Approved-At: Fri, 06 Mar 2020 23:06:52 -0500 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: 209.51.188.43 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-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:176986 Archived-At: Hello, I've been on the emacs-27 branch for about six months, and every now and then the point will begin erratically jumping around the current buffer without input. (I only got to addessing it now due to the impending release of 27.1.) Some observations: This only happens about once a week. C-g has no effect. There's no clues in *Messages* buffer. Point movement is beyond visible portion of buffer. It usually happens in emacs-lisp-mode buffers that have been open a few hours, but I've experienced it in other modes too. It seems like it could be font-lock/jit-lock moving point around outside of a save-excursion, but I know no way of confiming this. How should I go about debugging this? GNU Emacs 27.0.90 (build 2, x86_64-apple-darwin19.3.0, NS appkit-1894.30 Version 10.15.3 (Build 19D76)) of 2020-03-05