GNU bug report logs - #71424
29.3; auto-revert-use-notify buggy interaction with indirect buffers

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

From: z <at> bcc32.com
To: bug-gnu-emacs <at> gnu.org
Cc: z <at> bcc32.com
Subject: 29.3; auto-revert-use-notify buggy interaction with indirect buffers
Date: Sat, 08 Jun 2024 00:44:13 -0400

1. emacs -Q
2. Enable global-auto-revert-mode, and ensure auto-revert-use-notify=t
3. Open an org file, such as ~/temp.org
4. Insert some contents:

   * example org contents
  here is a subtree
   * another heading

5. Save the buffer
6. Outside of Emacs, modify ~/temp.org:

   $ echo asdf >> ~/temp.org

7. See that temp.org's buffer is immediately reverted in Emacs and
   contains the new contents that were added.
8. M-x org-tree-to-indirect-buffer
9. Kill the new indirect buffer

10. Modify ~/temp.org outside of Emacs again.  temp.org's buffer is
    not reverted, and even if you eval (auto-revert-buffers), the
    buffer is not reverted.

At this point, `auto-revert--buffer-by-watch-descriptor' does not
contain an entry for temp.org, and the value of
`auto-revert-notify-watch-descriptor' in temp.org is not present as a
key in that alist either.  As a result, when inotify events are
received by Emacs, `auto-revert-notify-handler' cannot find the buffer
whose file was apparently updated, and therefore it does not set
`auto-revert-notify-modified-p'.

When `auto-revert-handler' runs in temp.org, it sees that
`auto-revert-notify-watch-descriptor' is non-nil and
`auto-revert-notify-modified-p' is nil, and skips reverting the
buffer, even though the file has in fact been modified outside of
Emacs.


In GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.18.0, Xaw3d scroll bars)
Windowing system distributor 'HC-Consult', version 11.0.12014000
System Description: NixOS 24.05 (Uakari)

Configured using:
 'configure
 --prefix=/nix/store/8r6lgsfyak1mr2gg3ka6zkffxswkj3wv-emacs-29.3
 --disable-build-details --with-modules --with-x-toolkit=lucid
 --with-cairo --with-xft --with-compress-install
 --with-toolkit-scroll-bars --with-native-compilation
 --without-imagemagick --with-mailutils --without-small-ja-dic
 --with-tree-sitter --with-xinput2 --without-xwidgets --with-dbus
 --with-selinux'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP
NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XAW3D XDBE XIM XINPUT2 XPM
LUCID ZLIB

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

Major mode: Org

Minor modes in effect:
  global-evil-surround-mode: t
  evil-surround-mode: t
  evil-org-mode: t
  org-appear-mode: t
  org-modern-mode: t
  org-superstar-mode: t
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  windmove-mode: t
  pupo-mode: t
  purpose-mode: t
  evil-escape-mode: t
  global-display-line-numbers-mode: t
  global-vi-tilde-fringe-mode: t
  vi-tilde-fringe-mode: t
  recentf-mode: t
  eval-sexp-fu-flash-mode: t
  show-smartparens-global-mode: t
  show-smartparens-mode: t
  indent-guide-global-mode: t
  indent-guide-mode: t
  dired-async-mode: t
  global-corfu-mode: t
  corfu-mode: t
  winner-mode: t
  flyspell-mode: t
  flycheck-pos-tip-mode: t
  global-flycheck-mode: t
  global-spacemacs-whitespace-cleanup-mode: t
  spacemacs-whitespace-cleanup-mode: t
  winum-mode: t
  volatile-highlights-mode: t
  vertico-mode: t
  unkillable-scratch: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  global-term-cursor-mode: t
  term-cursor-mode: t
  save-place-mode: t
  savehist-mode: t
  persistent-scratch-autosave-mode: t
  org-wild-notifier-mode: t
  projectile-mode: t
  shell-dirtrack-mode: t
  server-mode: t
  mode-line-bell-mode: t
  marginalia-mode: t
  global-ligature-mode: t
  ligature-mode: t
  Info-breadcrumbs-in-mode-line-mode: t
  global-hl-todo-mode: t
  global-fasd-mode: t
  global-evil-quickscope-always-mode: t
  evil-quickscope-always-mode: t
  global-anzu-mode: t
  anzu-mode: t
  envrc-global-mode: t
  envrc-mode: t
  editorconfig-mode: t
  global-column-enforce-mode: t
  clean-aindent-mode: t
  hybrid-mode: t
  which-key-mode: t
  evil-mode: t
  evil-local-mode: t
  spacemacs-leader-override-mode: t
  global-spacemacs-leader-override-mode: t
  global-hl-line-mode: t
  xterm-mouse-mode: t
  global-auto-revert-mode: t
  which-function-mode: t
  minibuffer-depth-indicate-mode: t
  midnight-mode: t
  display-time-mode: t
  override-global-mode: t
  ido-vertical-mode: t
  global-page-break-lines-mode: t
  page-break-lines-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: org-auto-fill-function
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/home/aaron/.emacs.d/elpa/29.3/develop/load-env-vars-20180511.2210/load-env-vars hides /home/aaron/.emacs.d/core/libs/forks/load-env-vars
/home/aaron/.emacs.d/elpa/29.3/develop/spinner-1.7.4/spinner hides /home/aaron/.emacs.d/core/libs/spinner
/nix/store/gxi8whqw0hp0h1c83hh5l171qzk98n5g-emacs-packages-deps/share/emacs/site-lisp/site-start hides /nix/store/8r6lgsfyak1mr2gg3ka6zkffxswkj3wv-emacs-29.3/share/emacs/site-lisp/site-start
~/.spacemacs.d/custom hides /nix/store/8r6lgsfyak1mr2gg3ka6zkffxswkj3wv-emacs-29.3/share/emacs/29.3/lisp/custom
/home/aaron/.emacs.d/elpa/29.3/develop/transient-20240603.2200/transient hides /nix/store/8r6lgsfyak1mr2gg3ka6zkffxswkj3wv-emacs-29.3/share/emacs/29.3/lisp/transient
/home/aaron/.emacs.d/elpa/29.3/develop/hierarchy-20190425.842/hierarchy hides /nix/store/8r6lgsfyak1mr2gg3ka6zkffxswkj3wv-emacs-29.3/share/emacs/29.3/lisp/emacs-lisp/hierarchy
/nix/store/gxi8whqw0hp0h1c83hh5l171qzk98n5g-emacs-packages-deps/share/emacs/site-lisp/elpa/let-alist-1.0.6/let-alist hides /nix/store/8r6lgsfyak1mr2gg3ka6zkffxswkj3wv-emacs-29.3/share/emacs/29.3/lisp/emacs-lisp/let-alist

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Memory information:
((conses 16 1796915 1282520)
 (symbols 48 91360 3)
 (strings 32 366852 186994)
 (string-bytes 1 12422101)
 (vectors 16 112664)
 (vector-slots 8 2933826 1475577)
 (floats 8 620 2108)
 (intervals 56 71575 671)
 (buffers 984 53))

Message #8 received at 71424 <at> debbugs.gnu.org (full text, mbox):

From: "Aaron Zeng" <z <at> bcc32.com>
To: 71424 <at> debbugs.gnu.org
Date: Sat, 08 Jun 2024 00:46:55 -0400

[Message part 1 (text/plain, inline)]

I should add---this also happens with more common org-mode commands, such as org-capture, as well as plenty of commands from other major modes.  org-capture is where I actually first noticed this issue.

[Message part 2 (text/html, inline)]

Message #11 received at 71424 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: z <at> bcc32.com
Cc: 71424 <at> debbugs.gnu.org
Subject: Re: bug#71424: 29.3;
 auto-revert-use-notify buggy interaction with indirect buffers
Date: Sat, 08 Jun 2024 10:03:36 +0300

> Cc: z <at> bcc32.com
> From: z <at> bcc32.com
> Date: Sat, 08 Jun 2024 00:44:13 -0400
> 
> 
> 1. emacs -Q
> 2. Enable global-auto-revert-mode, and ensure auto-revert-use-notify=t
> 3. Open an org file, such as ~/temp.org
> 4. Insert some contents:
> 
>    * example org contents
>   here is a subtree
>    * another heading
> 
> 5. Save the buffer
> 6. Outside of Emacs, modify ~/temp.org:
> 
>    $ echo asdf >> ~/temp.org
> 
> 7. See that temp.org's buffer is immediately reverted in Emacs and
>    contains the new contents that were added.
> 8. M-x org-tree-to-indirect-buffer
> 9. Kill the new indirect buffer
> 
> 10. Modify ~/temp.org outside of Emacs again.  temp.org's buffer is
>     not reverted, and even if you eval (auto-revert-buffers), the
>     buffer is not reverted.

Thanks, but did you report this to the Org developers first?  If not,
please do, so they could analyze the issue and determine whether it's
an Org bug or a bug in some core Emacs functionality.

To see that at least the basic functionality works in Emacs, I did the
following:

  emacs -Q
  C-x C-f SOME-FILE RET
  M-x global-auto-revert-mode RET
  M-x clone-indirect-buffer RET

Then, outside Emacs, typed from the shell prompt

  $ cat OTHER-FILE >> SOME-FILE

where OTHER-FILE is some other existing file.  After that, I saw both
the base buffer's text and that of its indirect clone change to
reflect the appended text.

So my conclusion is that the Subject of your bug report is not
accurate: the auto-revert feature does work with indirect buffers as
expected.  Which is why I think this might be an Org specific issue,
since org-tree-to-indirect-buffer does more than just create an
indirect buffer.

Thanks.

Message #14 received at 71424 <at> debbugs.gnu.org (full text, mbox):

From: "Aaron Zeng" <z <at> bcc32.com>
To: "Eli Zaretskii" <eliz <at> gnu.org>
Cc: 71424 <at> debbugs.gnu.org
Subject: Re: bug#71424: 29.3;
 auto-revert-use-notify buggy interaction with indirect buffers
Date: Sat, 08 Jun 2024 11:30:08 -0400

On Sat, Jun 8, 2024, at 03:03, Eli Zaretskii wrote:

> To see that at least the basic functionality works in Emacs, I did the
> following:
>
>   emacs -Q
>   C-x C-f SOME-FILE RET
>   M-x global-auto-revert-mode RET
>   M-x clone-indirect-buffer RET
>
> Then, outside Emacs, typed from the shell prompt
>
>   $ cat OTHER-FILE >> SOME-FILE
>
> where OTHER-FILE is some other existing file.  After that, I saw both
> the base buffer's text and that of its indirect clone change to
> reflect the appended text.

Indeed, while the indirect buffer is live, everything works fine.  However, after you kill the indirect buffer, then the buffer no longer gets auto-reverted when you modify SOME-FILE outside Emacs.

> So my conclusion is that the Subject of your bug report is not
> accurate: the auto-revert feature does work with indirect buffers as
> expected.  Which is why I think this might be an Org specific issue,
> since org-tree-to-indirect-buffer does more than just create an
> indirect buffer.

Good point.  I didn't know about M-x clone-indirect-buffer ("If I had more time, I would have written a shorter letter", etc.).

Thanks for your quick reply.

Message #17 received at 71424 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: "Aaron Zeng" <z <at> bcc32.com>, Michael Albinus <michael.albinus <at> gmx.de>
Cc: 71424 <at> debbugs.gnu.org
Subject: Re: bug#71424: 29.3;
 auto-revert-use-notify buggy interaction with indirect buffers
Date: Sat, 08 Jun 2024 19:27:08 +0300

> Date: Sat, 08 Jun 2024 11:30:08 -0400
> From: "Aaron Zeng" <z <at> bcc32.com>
> Cc: 71424 <at> debbugs.gnu.org
> 
> On Sat, Jun 8, 2024, at 03:03, Eli Zaretskii wrote:
> 
> > To see that at least the basic functionality works in Emacs, I did the
> > following:
> >
> >   emacs -Q
> >   C-x C-f SOME-FILE RET
> >   M-x global-auto-revert-mode RET
> >   M-x clone-indirect-buffer RET
> >
> > Then, outside Emacs, typed from the shell prompt
> >
> >   $ cat OTHER-FILE >> SOME-FILE
> >
> > where OTHER-FILE is some other existing file.  After that, I saw both
> > the base buffer's text and that of its indirect clone change to
> > reflect the appended text.
> 
> Indeed, while the indirect buffer is live, everything works fine.  However, after you kill the indirect buffer, then the buffer no longer gets auto-reverted when you modify SOME-FILE outside Emacs.

Right.  Michael, is the below the correct fix?

diff --git a/lisp/autorevert.el b/lisp/autorevert.el
index a23d536..ab69add 100644
--- a/lisp/autorevert.el
+++ b/lisp/autorevert.el
@@ -378,8 +378,11 @@ auto-revert-debug
 (defun auto-revert-remove-current-buffer (&optional buffer)
   "Remove BUFFER from `auto-revert-buffer-list'.
 BUFFER defaults to `current-buffer'."
-  (setq auto-revert-buffer-list
-        (delq (or buffer (current-buffer)) auto-revert-buffer-list)))
+  (let ((buf (or buffer (current-buffer))))
+    ;; Don't remove the watch if we are killing an indirect buffer.
+    (or (buffer-base-buffer buf)
+        (setq auto-revert-buffer-list
+              (delq buf auto-revert-buffer-list)))))
 
 ;;;###autoload
 (define-minor-mode auto-revert-mode
@@ -639,7 +642,9 @@ auto-revert-set-timer
 
 (defun auto-revert-notify-rm-watch ()
   "Disable file notification for current buffer's associated file."
-  (when-let ((desc auto-revert-notify-watch-descriptor))
+  (when-let ((desc
+              (and (buffer-base-buffer)
+                   auto-revert-notify-watch-descriptor)))
     (setq auto-revert--buffer-by-watch-descriptor
           (assoc-delete-all desc auto-revert--buffer-by-watch-descriptor))
     (ignore-errors

Message #20 received at 71424 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Aaron Zeng <z <at> bcc32.com>, 71424 <at> debbugs.gnu.org
Subject: Re: bug#71424: 29.3; auto-revert-use-notify buggy interaction with
 indirect buffers
Date: Sat, 08 Jun 2024 18:57:45 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

Hi Eli,

>> Indeed, while the indirect buffer is live, everything works fine.
>> However, after you kill the indirect buffer, then the buffer no
>> longer gets auto-reverted when you modify SOME-FILE outside Emacs.
>
> Right.  Michael, is the below the correct fix?

I haven't tested yet, but it looks proper to me. You might push it.

I will add a test for this case next days.

Best regards, Michael.

Message #23 received at 71424 <at> debbugs.gnu.org (full text, mbox):

From: "Aaron Zeng" <z <at> bcc32.com>
To: "Eli Zaretskii" <eliz <at> gnu.org>, "Michael Albinus" <michael.albinus <at> gmx.de>
Cc: 71424 <at> debbugs.gnu.org
Subject: Re: bug#71424: 29.3;
 auto-revert-use-notify buggy interaction with indirect buffers
Date: Sat, 08 Jun 2024 13:06:28 -0400

On Sat, Jun 8, 2024, at 12:27, Eli Zaretskii wrote:
> diff --git a/lisp/autorevert.el b/lisp/autorevert.el
> index a23d536..ab69add 100644
> --- a/lisp/autorevert.el
> +++ b/lisp/autorevert.el
> @@ -378,8 +378,11 @@ auto-revert-debug
>  (defun auto-revert-remove-current-buffer (&optional buffer)
>    "Remove BUFFER from `auto-revert-buffer-list'.
>  BUFFER defaults to `current-buffer'."
> -  (setq auto-revert-buffer-list
> -        (delq (or buffer (current-buffer)) auto-revert-buffer-list)))
> +  (let ((buf (or buffer (current-buffer))))
> +    ;; Don't remove the watch if we are killing an indirect buffer.
> +    (or (buffer-base-buffer buf)
> +        (setq auto-revert-buffer-list
> +              (delq buf auto-revert-buffer-list)))))

(take my reply with a grain of salt---I'm not that familiar with this code).  I think this will leave killed buffers in auto-revert-buffer-list, which seems wrong to me.

>  ;;;###autoload
>  (define-minor-mode auto-revert-mode
> @@ -639,7 +642,9 @@ auto-revert-set-timer
> 
>  (defun auto-revert-notify-rm-watch ()
>    "Disable file notification for current buffer's associated file."
> -  (when-let ((desc auto-revert-notify-watch-descriptor))
> +  (when-let ((desc
> +              (and (buffer-base-buffer)
> +                   auto-revert-notify-watch-descriptor)))
>      (setq auto-revert--buffer-by-watch-descriptor
>            (assoc-delete-all desc auto-revert--buffer-by-watch-descriptor))
>      (ignore-errors

Maybe I'm reading the code wrong, but should this be (not (buffer-base-buffer)) instead?

Message #26 received at 71424 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: z <at> bcc32.com, 71424 <at> debbugs.gnu.org
Subject: Re: bug#71424: 29.3; auto-revert-use-notify buggy interaction with
 indirect buffers
Date: Sat, 08 Jun 2024 20:44:57 +0300

> From: Michael Albinus <michael.albinus <at> gmx.de>
> Cc: "Aaron Zeng" <z <at> bcc32.com>,  71424 <at> debbugs.gnu.org
> Date: Sat, 08 Jun 2024 18:57:45 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> Hi Eli,
> 
> >> Indeed, while the indirect buffer is live, everything works fine.
> >> However, after you kill the indirect buffer, then the buffer no
> >> longer gets auto-reverted when you modify SOME-FILE outside Emacs.
> >
> > Right.  Michael, is the below the correct fix?
> 
> I haven't tested yet, but it looks proper to me. You might push it.

Thanks, done.

> I will add a test for this case next days.

Thanks.

Message #31 received at 71424-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: "Aaron Zeng" <z <at> bcc32.com>
Cc: michael.albinus <at> gmx.de, 71424-done <at> debbugs.gnu.org
Subject: Re: bug#71424: 29.3;
 auto-revert-use-notify buggy interaction with indirect buffers
Date: Sat, 08 Jun 2024 20:45:41 +0300

> Date: Sat, 08 Jun 2024 13:06:28 -0400
> From: "Aaron Zeng" <z <at> bcc32.com>
> Cc: 71424 <at> debbugs.gnu.org
> 
> On Sat, Jun 8, 2024, at 12:27, Eli Zaretskii wrote:
> > diff --git a/lisp/autorevert.el b/lisp/autorevert.el
> > index a23d536..ab69add 100644
> > --- a/lisp/autorevert.el
> > +++ b/lisp/autorevert.el
> > @@ -378,8 +378,11 @@ auto-revert-debug
> >  (defun auto-revert-remove-current-buffer (&optional buffer)
> >    "Remove BUFFER from `auto-revert-buffer-list'.
> >  BUFFER defaults to `current-buffer'."
> > -  (setq auto-revert-buffer-list
> > -        (delq (or buffer (current-buffer)) auto-revert-buffer-list)))
> > +  (let ((buf (or buffer (current-buffer))))
> > +    ;; Don't remove the watch if we are killing an indirect buffer.
> > +    (or (buffer-base-buffer buf)
> > +        (setq auto-revert-buffer-list
> > +              (delq buf auto-revert-buffer-list)))))
> 
> (take my reply with a grain of salt---I'm not that familiar with this code).  I think this will leave killed buffers in auto-revert-buffer-list, which seems wrong to me.

Fixed.

> >  ;;;###autoload
> >  (define-minor-mode auto-revert-mode
> > @@ -639,7 +642,9 @@ auto-revert-set-timer
> > 
> >  (defun auto-revert-notify-rm-watch ()
> >    "Disable file notification for current buffer's associated file."
> > -  (when-let ((desc auto-revert-notify-watch-descriptor))
> > +  (when-let ((desc
> > +              (and (buffer-base-buffer)
> > +                   auto-revert-notify-watch-descriptor)))
> >      (setq auto-revert--buffer-by-watch-descriptor
> >            (assoc-delete-all desc auto-revert--buffer-by-watch-descriptor))
> >      (ignore-errors
> 
> Maybe I'm reading the code wrong, but should this be (not (buffer-base-buffer)) instead?

Also fixed.

I'm therefore closing this bug.

Message #34 received at 71424 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: z <at> bcc32.com, 71424 <at> debbugs.gnu.org
Subject: Re: bug#71424: 29.3; auto-revert-use-notify buggy interaction with
 indirect buffers
Date: Mon, 10 Jun 2024 13:15:21 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

Hi Eli,

>> I will add a test for this case next days.
>
> Thanks.

Done, pushed to master as 24448b7bbb8.

Best regards, Michael.

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