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Subject: bug#77704: 30.1; xml-mode enters infinite loop when saving with unclosed XML  comment
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To reproduce:

1. emacs -Q
2. Open a new buffer and enter: <!--
3. Set mode to xml-mode: M-x xml-mode
4. Save buffer: C-x C-s

Expected: Save succeeds, or a warning about unclosed comment.

Actual: Emacs enters an infinite loop or hangs. Requires external =
termination.

Notes:
- Adding --> afterwards doesn't clear the loop unless syntax-propertize =
is run manually.
- Occurs reliably in xml-mode, not in nxml-mode.
- Possibly related to scan-sexps or syntax-propertize caching.

System:
- Emacs 29.x on macOS (Apple Silicon)
- Reproducible: 100%





In GNU Emacs 30.1 (build 1, aarch64-apple-darwin21.6.0, NS
appkit-2113.65 Version 12.7.6 (Build 21H1320)) of 2025-02-24 built on
armbob.lan
Windowing system distributor 'Apple', version 10.3.2575
System Description:  macOS 15.3.1

Configured using:
'configure --with-ns '--enable-locallisppath=3D/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp' --with-modules 'CFLAGS=3D-DFD_SETSIZE=3D10000
-DDARWIN_UNLIMITED_SELECT' --with-x-toolkit=3Dno'

Configured features:
ACL GLIB GMP GNUTLS JPEG LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER PNG
RSVG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM ZLIB

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

Major mode: nXML

Minor modes in effect:
  helm-mode: t
  helm-minibuffer-history-mode: t
  rng-validate-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  which-key-mode: t
  override-global-mode: t
  global-hl-line-mode: t
  global-display-line-numbers-mode: t
  display-line-numbers-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/Users/kojie/.emacs.d/elpa/which-key-20240620.2145/which-key hides =
/Applications/Emacs.app/Contents/Resources/lisp/which-key
/Users/kojie/.emacs.d/elpa/transient-20250205.2244/transient hides =
/Applications/Emacs.app/Contents/Resources/lisp/transient

Features:
(shadow sort mail-extr emacsbug message yank-media puny rfc822 mml
mml-sec epa derived epg rfc6068 epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils winner
tramp-archive tramp-gvfs dbus xml helm-command helm-elisp helm-eval
edebug debug backtrace helm-info helm-mode helm-misc helm-files
image-dired image-dired-tags image-dired-external image-dired-util
image-mode dired dired-loaddefs exif filenotify tramp trampver
tramp-integration files-x tramp-message tramp-compat xdg shell
parse-time iso8601 tramp-loaddefs helm-buffers helm-x-icons helm-occur
helm-tags helm-locate helm-grep helm-regexp helm-utils helm-help
helm-types helm helm-global-bindings helm-easymenu helm-core helm-source
helm-multi-match helm-lib async rng-xsd xsd-regexp rng-cmpct rng-nxml
rng-valid rng-loc rng-uri rng-parse nxml-parse rng-match rng-dt rng-util
rng-pttrn nxml-ns nxml-mode nxml-outln nxml-rap sgml-mode facemenu dom
nxml-util nxml-enc xmltok company-oddmuse company-keywords company-etags
company-gtags company-dabbrev-code company-dabbrev company-files
company-clang company-capf company-cmake company-semantic
company-template company-bbdb company flycheck rainbow-mode color org ob
ob-tangle ob-ref ob-lob ob-table ob-exp org-macro org-src sh-script
treesit executable ob-comint org-pcomplete pcomplete org-list
org-footnote org-faces org-entities time-date noutline outline
org-version ob-emacs-lisp ob-core ob-eval org-cycle org-table ol
org-fold org-fold-core org-keys oc org-loaddefs find-func cal-menu
calendar cal-loaddefs org-compat org-macs format-spec undo-tree diff
queue which-key lua-mode edmacro kmacro perl-mode ruby-mode smie
rust-utils rust-prog-mode rx rust-mode rust-playpen rust-cargo
rust-common rust-rustfmt rust-compile go-mode find-file ffap thingatpt
etags fileloop generator xref project compile text-property-search
comint ansi-osc ansi-color ring cl-extra help-mode use-package
use-package-ensure use-package-delight use-package-diminish
use-package-bind-key bind-key easy-mmode use-package-core finder-inf
hl-line display-line-numbers company-autoloads flycheck-autoloads
go-mode-autoloads helm-autoloads helm-core-autoloads async-autoloads
lsp-ui-autoloads lsp-mode-autoloads f-autoloads lua-mode-autoloads
magit-autoloads pcase magit-section-autoloads llama-autoloads
markdown-mode-autoloads neotree-autoloads python-mode-autoloads
rainbow-mode-autoloads rust-mode-autoloads spinner-autoloads
transient-autoloads treemacs-autoloads cfrs-autoloads posframe-autoloads
ht-autoloads hydra-autoloads lv-autoloads pfuture-autoloads
ace-window-autoloads avy-autoloads s-autoloads dash-autoloads
undo-tree-autoloads queue-autoloads wfnames-autoloads
which-key-autoloads with-editor-autoloads info yatex-autoloads package
browse-url url url-proxy url-privacy url-expand url-methods url-history
url-cookie generate-lisp-file url-domsuf url-util mailcap url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs icons
password-cache json subr-x map byte-opt gv bytecomp byte-compile
url-vars cl-loaddefs cl-lib japan-util rmc iso-transl tooltip cconv
eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/ns-win ns-win ucs-normalize mule-util
term/common-win tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode lisp-mode prog-mode register
page tab-bar menu-bar rfn-eshadow isearch easymenu timer select
scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors
frame minibuffer nadvice seq simple cl-generic indonesian philippine
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp
files window text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget keymap hashtable-print-readable backquote
threads kqueue cocoa ns multi-tty make-network-process emacs)

Memory information:
((conses 16 492670 105067) (symbols 48 33810 1)
  (strings 32 167280 14163) (string-bytes 1 4288032)
  (vectors 16 60305) (vector-slots 8 1205224 78794) (floats 8 339 57)
  (intervals 56 1288 187) (buffers 992 15))

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: TANIKAWAKoji <kojie.yk@HIDDEN>
Subject: bug#77704: Acknowledgement (30.1; xml-mode enters infinite loop
 when saving with unclosed XML  comment)
Message-ID: <handler.77704.B.174429411331103.ack <at> debbugs.gnu.org>
References: <1B4B7695-ABDE-41CF-A512-98AC7DE3ED82@HIDDEN>
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#77704: 30.1; xml-mode enters infinite loop when saving with unclosed XML  comment
Resent-From: Eli Zaretskii <eliz@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
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To: TANIKAWAKoji <kojie.yk@HIDDEN>
Cc: 77704 <at> debbugs.gnu.org
Date: Sat, 12 Apr 2025 13:34:56 +0300
Message-Id: <86plhhmzvz.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <1B4B7695-ABDE-41CF-A512-98AC7DE3ED82@HIDDEN>
 (bug-gnu-emacs@HIDDEN)
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> Date: Thu, 10 Apr 2025 16:49:25 +0900
> From:  TANIKAWAKoji via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> 
> To reproduce:
> 
> 1. emacs -Q
> 2. Open a new buffer and enter: <!--
> 3. Set mode to xml-mode: M-x xml-mode
> 4. Save buffer: C-x C-s
> 
> Expected: Save succeeds, or a warning about unclosed comment.
> 
> Actual: Emacs enters an infinite loop or hangs. Requires external termination.

I cannot reproduce this, neither with the stock Emacs 29.1 nor with
later versions.  Are you sure you are using xml-mode from Emacs?  In
Emacs 29.1, xml-mode is just an alias for nxml-mode.

Maybe this is macOS specific?

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#77704: 30.1; xml-mode enters infinite loop when saving with unclosed XML  comment
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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To: kojie.yk@HIDDEN
Cc: 77704 <at> debbugs.gnu.org
Date: Sat, 26 Apr 2025 14:32:24 +0300
Message-Id: <86cyczupiv.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <86plhhmzvz.fsf@HIDDEN> (message from Eli Zaretskii on Sat, 12
 Apr 2025 13:34:56 +0300)
References: <1B4B7695-ABDE-41CF-A512-98AC7DE3ED82@HIDDEN>
 <86plhhmzvz.fsf@HIDDEN>
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Ping!  Can someone try reproducing this?

> Cc: 77704 <at> debbugs.gnu.org
> Date: Sat, 12 Apr 2025 13:34:56 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> > Date: Thu, 10 Apr 2025 16:49:25 +0900
> > From:  TANIKAWAKoji via "Bug reports for GNU Emacs,
> >  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> > 
> > 
> > To reproduce:
> > 
> > 1. emacs -Q
> > 2. Open a new buffer and enter: <!--
> > 3. Set mode to xml-mode: M-x xml-mode
> > 4. Save buffer: C-x C-s
> > 
> > Expected: Save succeeds, or a warning about unclosed comment.
> > 
> > Actual: Emacs enters an infinite loop or hangs. Requires external termination.
> 
> I cannot reproduce this, neither with the stock Emacs 29.1 nor with
> later versions.  Are you sure you are using xml-mode from Emacs?  In
> Emacs 29.1, xml-mode is just an alias for nxml-mode.
> 
> Maybe this is macOS specific?
> 
> 
> 
>

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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <86cyczupiv.fsf@HIDDEN> (message from Eli Zaretskii on Sat, 26
 Apr 2025 14:32:24 +0300)
References: <1B4B7695-ABDE-41CF-A512-98AC7DE3ED82@HIDDEN>
 <86plhhmzvz.fsf@HIDDEN> <86cyczupiv.fsf@HIDDEN>
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Ping! Ping!  Any chance for reproducing this, anyone?

> Cc: 77704 <at> debbugs.gnu.org
> Date: Sat, 26 Apr 2025 14:32:24 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> Ping!  Can someone try reproducing this?
> 
> > Cc: 77704 <at> debbugs.gnu.org
> > Date: Sat, 12 Apr 2025 13:34:56 +0300
> > From: Eli Zaretskii <eliz@HIDDEN>
> > 
> > > Date: Thu, 10 Apr 2025 16:49:25 +0900
> > > From:  TANIKAWAKoji via "Bug reports for GNU Emacs,
> > >  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> > > 
> > > 
> > > To reproduce:
> > > 
> > > 1. emacs -Q
> > > 2. Open a new buffer and enter: <!--
> > > 3. Set mode to xml-mode: M-x xml-mode
> > > 4. Save buffer: C-x C-s
> > > 
> > > Expected: Save succeeds, or a warning about unclosed comment.
> > > 
> > > Actual: Emacs enters an infinite loop or hangs. Requires external termination.
> > 
> > I cannot reproduce this, neither with the stock Emacs 29.1 nor with
> > later versions.  Are you sure you are using xml-mode from Emacs?  In
> > Emacs 29.1, xml-mode is just an alias for nxml-mode.
> > 
> > Maybe this is macOS specific?
> > 
> > 
> > 
> > 
> 
> 
> 
>

Last modified: Sat, 10 May 2025 09:45:01 UTC

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