GNU bug report logs - #73548
31.0.50; track-changes--error-log

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; track-changes--error-log
Date: Sun, 29 Sep 2024 09:32:04 +0200

This is a warning I got today while editing a C file. No idea how to
reproduce, I'm afraid. This is master on a terminal frame.

   ■  Warning (emacs): Missing/incorrect calls to ‘before/after-change-functions’!!
  Details logged to ‘track-changes--error-log’

track-changes--error-log is a variable defined in ‘track-changes.el’.

Its value is shown below.

List of errors encountered.
Each element is a triplet (BUFFER-NAME BACKTRACE RECENT-KEYS).

Value:
(("frame.h" #1=(unexpected-after 47748 47748 1)
  ((t track-changes--recover-from-error (#1#) nil)
   (t track-changes--after (47748 47748 1) nil)
   (t delete-char (-1 nil) nil) (t delete-backward-char (1 nil) nil)
   (t backward-delete-char-untabify (1) nil)
   (t c-electric-backspace (nil) nil)
   (t funcall-interactively (c-electric-backspace nil) nil)
   (t call-interactively (c-electric-backspace nil nil) nil)
   (t command-execute (c-electric-backspace) nil))
  [86 (nil . self-insert-command) 73 (nil . self-insert-command) 83
      (nil . self-insert-command) 73 (nil . self-insert-command) 66
      (nil . self-insert-command) 76 (nil . self-insert-command) 69
      (nil . self-insert-command) 32 (nil . self-insert-command) 40
      (nil . c-electric-paren) 127 (nil . c-electric-backspace)]))

In GNU Emacs 31.0.50 (build 1, aarch64-apple-darwin24.0.0) of 2024-09-26
 built on MacBookPro.fritz.box
Repository revision: 2f485e68ff96cc66a17df2c0a58e272bbfc24765
Repository branch: master
System Description:  macOS 15.0

Configured using:
 'configure --without-ns --cache-file
 /var/folders/1d/k_6t25f94sl83szqbf8gpkrh0000gn/T//config.cache.master
 --with-native-compilation=no CC=clang 'CFLAGS=-Wgnu-imaginary-constant
 -Wunused-result -g -fno-omit-frame-pointer''

Configured features:
ACL DBUS GNUTLS LCMS2 LIBXML2 MODULES NOTIFY KQUEUE PDUMPER SQLITE3
THREADS TREE_SITTER ZLIB

Important settings:
  value of $LC_CTYPE: UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Help

Minor modes in effect:
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  yas-minor-mode: t
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  global-git-commit-mode: t
  magit-auto-revert-mode: t
  server-mode: t
  psession-mode: t
  psession-autosave-mode: t
  psession-savehist-mode: t
  global-kkp-mode: t
  transient-posframe-mode: t
  global-auto-revert-mode: t
  recentf-mode: t
  xterm-mouse-mode: t
  repeat-mode: t
  windmove-mode: t
  which-key-posframe-mode: t
  which-key-mode: t
  persistent-scratch-autosave-mode: t
  delete-selection-mode: t
  global-hl-line-mode: t
  global-display-line-numbers-mode: t
  display-line-numbers-mode: t
  ws-butler-global-mode: t
  ws-butler-mode: t
  mouse-wheel-mode: t
  corfu-terminal-mode: t
  global-corfu-mode: t
  corfu-mode: t
  vertico-posframe-mode: t
  vertico-multiform-mode: t
  vertico-mouse-mode: t
  vertico-mode: t
  override-global-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  isearch-fold-quotes-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  buffer-read-only: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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Message #8 received at 73548 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>,
 Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 73548 <at> debbugs.gnu.org
Subject: Re: bug#73548: 31.0.50; track-changes--error-log
Date: Sun, 29 Sep 2024 11:14:02 +0300

> From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
> Date: Sun, 29 Sep 2024 09:32:04 +0200
> 
> This is a warning I got today while editing a C file. No idea how to
> reproduce, I'm afraid. This is master on a terminal frame.
> 
>    ■  Warning (emacs): Missing/incorrect calls to ‘before/after-change-functions’!!
>   Details logged to ‘track-changes--error-log’
> 
> track-changes--error-log is a variable defined in ‘track-changes.el’.
> 
> Its value is shown below.
> 
> List of errors encountered.
> Each element is a triplet (BUFFER-NAME BACKTRACE RECENT-KEYS).
> 
> Value:
> (("frame.h" #1=(unexpected-after 47748 47748 1)
>   ((t track-changes--recover-from-error (#1#) nil)
>    (t track-changes--after (47748 47748 1) nil)
>    (t delete-char (-1 nil) nil) (t delete-backward-char (1 nil) nil)
>    (t backward-delete-char-untabify (1) nil)
>    (t c-electric-backspace (nil) nil)
>    (t funcall-interactively (c-electric-backspace nil) nil)
>    (t call-interactively (c-electric-backspace nil nil) nil)
>    (t command-execute (c-electric-backspace) nil))
>   [86 (nil . self-insert-command) 73 (nil . self-insert-command) 83
>       (nil . self-insert-command) 73 (nil . self-insert-command) 66
>       (nil . self-insert-command) 76 (nil . self-insert-command) 69
>       (nil . self-insert-command) 32 (nil . self-insert-command) 40
>       (nil . c-electric-paren) 127 (nil . c-electric-backspace)]))
> 
> In GNU Emacs 31.0.50 (build 1, aarch64-apple-darwin24.0.0) of 2024-09-26
>  built on MacBookPro.fritz.box
> Repository revision: 2f485e68ff96cc66a17df2c0a58e272bbfc24765
> Repository branch: master
> System Description:  macOS 15.0

Adding Stefan.

Message #11 received at 73548 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: 73548 <at> debbugs.gnu.org
Subject: Re: bug#73548: 31.0.50; track-changes--error-log
Date: Thu, 03 Oct 2024 11:15:10 -0400

Hi Gerd,

> This is a warning I got today while editing a C file. No idea how to
> reproduce, I'm afraid. This is master on a terminal frame.
>
>    ■  Warning (emacs): Missing/incorrect calls to ‘before/after-change-functions’!!
>   Details logged to ‘track-changes--error-log’
>
> track-changes--error-log is a variable defined in ‘track-changes.el’.
>
> Its value is shown below.
>
> List of errors encountered.
> Each element is a triplet (BUFFER-NAME BACKTRACE RECENT-KEYS).
>
> Value:
> (("frame.h" #1=(unexpected-after 47748 47748 1)
>   ((t track-changes--recover-from-error (#1#) nil)
>    (t track-changes--after (47748 47748 1) nil)
>    (t delete-char (-1 nil) nil) (t delete-backward-char (1 nil) nil)
>    (t backward-delete-char-untabify (1) nil)
>    (t c-electric-backspace (nil) nil)
>    (t funcall-interactively (c-electric-backspace nil) nil)
>    (t call-interactively (c-electric-backspace nil nil) nil)
>    (t command-execute (c-electric-backspace) nil))
>   [86 (nil . self-insert-command) 73 (nil . self-insert-command) 83
>       (nil . self-insert-command) 73 (nil . self-insert-command) 66
>       (nil . self-insert-command) 76 (nil . self-insert-command) 69
>       (nil . self-insert-command) 32 (nil . self-insert-command) 40
>       (nil . c-electric-paren) 127 (nil . c-electric-backspace)]))

Hmm... the recent-keys only include "harmless" commands which definitely
should not trigger those "unexpected-after" problems.

The problem that track-changes reports here is that the call to
`after-change-functions` specified a region that's (apparently) outside
the area specified by the previous `before-change-functions`.
Since this is within `delete-char` (according to the backtrace), it's
very weird: `delete-char` is a very basic case where such an error
should have been noticed many years ago.

Do you remember if there might have been other buffer changes during
this `delete-char` e.g. because of some other package hooked (directly
or not) into one of the `*-change-functions`?


        Stefan

Message #14 received at 73548 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 73548 <at> debbugs.gnu.org
Subject: Re: bug#73548: 31.0.50; track-changes--error-log
Date: Thu, 03 Oct 2024 17:33:07 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> Hi Gerd,
>
>> This is a warning I got today while editing a C file. No idea how to
>> reproduce, I'm afraid. This is master on a terminal frame.
>>
>>    ■  Warning (emacs): Missing/incorrect calls to ‘before/after-change-functions’!!
>>   Details logged to ‘track-changes--error-log’
>>
>> track-changes--error-log is a variable defined in ‘track-changes.el’.
>>
>> Its value is shown below.
>>
>> List of errors encountered.
>> Each element is a triplet (BUFFER-NAME BACKTRACE RECENT-KEYS).
>>
>> Value:
>> (("frame.h" #1=(unexpected-after 47748 47748 1)
>>   ((t track-changes--recover-from-error (#1#) nil)
>>    (t track-changes--after (47748 47748 1) nil)
>>    (t delete-char (-1 nil) nil) (t delete-backward-char (1 nil) nil)
>>    (t backward-delete-char-untabify (1) nil)
>>    (t c-electric-backspace (nil) nil)
>>    (t funcall-interactively (c-electric-backspace nil) nil)
>>    (t call-interactively (c-electric-backspace nil nil) nil)
>>    (t command-execute (c-electric-backspace) nil))
>>   [86 (nil . self-insert-command) 73 (nil . self-insert-command) 83
>>       (nil . self-insert-command) 73 (nil . self-insert-command) 66
>>       (nil . self-insert-command) 76 (nil . self-insert-command) 69
>>       (nil . self-insert-command) 32 (nil . self-insert-command) 40
>>       (nil . c-electric-paren) 127 (nil . c-electric-backspace)]))
>
> Hmm... the recent-keys only include "harmless" commands which definitely
> should not trigger those "unexpected-after" problems.
>
> The problem that track-changes reports here is that the call to
> `after-change-functions` specified a region that's (apparently) outside
> the area specified by the previous `before-change-functions`.
> Since this is within `delete-char` (according to the backtrace), it's
> very weird: `delete-char` is a very basic case where such an error
> should have been noticed many years ago.
>
> Do you remember if there might have been other buffer changes during
> this `delete-char` e.g. because of some other package hooked (directly
> or not) into one of the `*-change-functions`?


Hi Stefan,

the only "extra" I have running in C buffers is eglot, with
eglot-ensure in c-mode-common-hook. Don't know if Eglot changes the
buffer, maybe when it wants to add diagnostics?

Message #17 received at 73548 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: 73548 <at> debbugs.gnu.org
Subject: Re: bug#73548: 31.0.50; track-changes--error-log
Date: Thu, 03 Oct 2024 14:36:26 -0400

> the only "extra" I have running in C buffers is eglot, with
> eglot-ensure in c-mode-common-hook. Don't know if Eglot changes the
> buffer, maybe when it wants to add diagnostics?

Hmm... I don't think Eglot would make changes to the buffer behind
your back.

Not sure what more we can do with this report if you can't reproduce it.
But in case you do see it "every once in a while", then I pushed to
`master` some extra debugging support in `track-changes.el`.

So, try and `(setq track-changes-record-errors 'trace)` in your init
file to activate this extra debugging info, so that next time you hit
the problem we have a better chance of catching the sucker.


        Stefan

Message #20 received at 73548 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 73548 <at> debbugs.gnu.org
Subject: Re: bug#73548: 31.0.50; track-changes--error-log
Date: Thu, 03 Oct 2024 20:46:12 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> the only "extra" I have running in C buffers is eglot, with
>> eglot-ensure in c-mode-common-hook. Don't know if Eglot changes the
>> buffer, maybe when it wants to add diagnostics?
>
> Hmm... I don't think Eglot would make changes to the buffer behind
> your back.
>
> Not sure what more we can do with this report if you can't reproduce it.
> But in case you do see it "every once in a while", then I pushed to
> `master` some extra debugging support in `track-changes.el`.
>
> So, try and `(setq track-changes-record-errors 'trace)` in your init
> file to activate this extra debugging info, so that next time you hit
> the problem we have a better chance of catching the sucker.

Thanks, I've added that to my init file. Let's see if it resurfaces.

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