GNU bug report logs - #39967
27.0.90; how to debug point moving erratically?

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Package: emacs;

Reported by: William Rankin <william <at> bydasein.com>

Date: Sat, 7 Mar 2020 04:07:02 UTC

Severity: normal

Tags: moreinfo

Found in version 27.0.90

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: William Rankin <william <at> bydasein.com>
To: 39967 <at> debbugs.gnu.org
Subject: bug#39967: 27.0.90; how to debug point moving erratically?
Date: Sat, 07 Mar 2020 13:49:33 +1000
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




This bug report was last modified 3 years and 126 days ago.

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