GNU bug report logs - #79425
31.0.50; `subst-char-in-string' crashes

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

From: Rudolf Adamkovič <rudolf <at> adamkovic.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; `subst-char-in-string' crashes
Date: Wed, 10 Sep 2025 23:24:13 +0200

I am trying to export an Org mode file with citations using Emacs
compiled from `master' on NS.  The export crashes in `citeproc-el', a
3rd-party library used by Org to format citations.  I reported the
problem upstream [1], and it seems to be a problem with Emacs itself.

[1] https://github.com/andras-simonyi/citeproc-el/issues/181

REPRODUCTION STEPS:

  1. Checkout Emacs from Git commit `66ef930ebea'.
  1. Run `emacs -Q' on NS (MacOS 15.5).
  2. Evaluate `(subst-char-in-string 39 700 "D'Arcus" t)' in *scratch*.

UNEXPECTED ERROR:

  Debugger entered--Lisp error: (error "Attempt to store non-byte value into unibyte string")
    aset("D'Arcus" 1 700)
    (if (eq (aref newstr i) fromchar) (aset newstr i tochar))
    (while (> i 0) (setq i (1- i)) (if (eq (aref newstr i) fromchar) (aset newstr i tochar)))
    (let ((i (length string)) (newstr (if inplace string (copy-sequence string)))) (while (> i 0) (setq i (1- i)) (if (eq (aref newstr i) fromchar) (aset newstr i tochar))) newstr)
    (if (and (not inplace) (if (multibyte-string-p string) (> (max fromchar tochar) 127) (> tochar 255))) (let ((res (string-replace (string fromchar) (string tochar) string))) (if (eq res string) nil (let ((tail (object-intervals string))) (while tail (let ((p ...)) (set-text-properties (nth 0 p) (nth 1 p) (nth 2 p) res) (setq tail (cdr tail)))))) res) (let ((i (length string)) (newstr (if inplace string (copy-sequence string)))) (while (> i 0) (setq i (1- i)) (if (eq (aref newstr i) fromchar) (aset newstr i tochar))) newstr))
    subst-char-in-string(39 700 "D'Arcus" t)
    (progn (subst-char-in-string 39 700 "D'Arcus" t))
    eval((progn (subst-char-in-string 39 700 "D'Arcus" t)) t)
    elisp--eval-last-sexp(nil)
    #f(compiled-function () #<bytecode 0x1866e771e8a2>)()
    eval-last-sexp(nil)
    funcall-interactively(eval-last-sexp nil)
    command-execute(eval-last-sexp)

Rudy


In GNU Emacs 31.0.50 (build 1, aarch64-apple-darwin24.5.0, NS
 appkit-2575.60 Version 15.5 (Build 24F74)) of 2025-09-01 built on
 skynet.local
Repository revision: 66ef930ebea4618c1dac71a09495766476ced1d6
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2575
System Description:  macOS 15.5

Configured using:
 'configure --with-json --with-tree-sitter --with-sqlite3
 --with-native-compilation=aot'

Configured features:
ACL GLIB GNUTLS LCMS2 LIBXML2 MODULES NATIVE_COMP NOTIFY KQUEUE NS
PDUMPER PNG RSVG SQLITE3 THREADS TOOLKIT_SCROLL_BARS TREE_SITTER WEBP
XIM ZLIB

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

Major mode: Org

Minor modes in effect:
  telega-root-auto-fill-mode: t
  telega-contact-birthdays-mode: t
  telega-active-video-chats-mode: t
  telega-active-locations-mode: t
  telega-patrons-mode: t
  telega-mode-line-mode: t
  telega-active-stories-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  TeX-PDF-mode: t
  global-hi-lock-mode: t
  hi-lock-mode: t
  global-jinx-mode: t
  jinx-mode: t
  compile-angel-on-load-mode: t
  marginalia-mode: t
  corfu-history-mode: t
  global-corfu-mode: t
  corfu-mode: t
  vertico-multiform-mode: t
  vertico-mode: t
  openwith-mode: t
  global-hl-todo-mode: t
  global-diff-hl-mode: t
  diff-hl-mode: t
  minibuffer-depth-indicate-mode: t
  delete-selection-mode: t
  global-subword-mode: t
  subword-mode: t
  save-place-mode: t
  global-auto-revert-mode: t
  savehist-mode: t
  global-goto-address-mode: t
  goto-address-mode: t
  org-indent-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  minibuffer-regexp-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  delete-trailing-whitespace-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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Features:
(shadow graphviz-dot-mode grep org-archive telega-obsolete telega
telega-tdlib-events telega-match telega-root telega-info telega-chat
telega-modes telega-company telega-emoji telega-user
telega-notifications notifications telega-voip telega-msg telega-story
telega-webpage visual-fill-column telega-tme telega-sticker
telega-vvnote bindat telega-ffplay telega-i18n telega-sort telega-filter
telega-ins telega-inline telega-util telega-folders telega-topic
telega-media telega-tdlib telega-server telega-core telega-customize
emacsbug wdired markdown-mode edit-indirect pulse macrostep-c cmacexp
macrostep loadhist latexenc tramp-cmds tramp-cache time-stamp tramp-sh
shortdoc rect bbdb bbdb-site timezone cal-iso password-store
auth-source-pass epa-file network-stream nsm mailalias smtpmail textsec
uni-scripts idna-mapping uni-confusable textsec-check qp sort mail-extr
mm-archive face-remap magit-extras magit-bookmark magit-submodule
magit-blame magit-stash magit-reflog magit-bisect magit-push magit-pull
magit-fetch magit-clone magit-remote magit-commit magit-sequence
magit-notes magit-worktree magit-tag magit-merge magit-branch
magit-reset magit-files magit-refs magit-status magit magit-repos
magit-apply magit-wip magit-log which-func magit-diff smerge-mode
git-commit magit-core magit-autorevert magit-margin magit-transient
magit-process with-editor server magit-mode benchmark magit-git
magit-base magit-section llama cond-let slime apropos arc-mode
archive-mode hyperspec make-mode ebnf-mode plantuml-mode deflate
citar-org citar citar-file citar-cache citar-format perl-mode
org-duration cursor-sensor ess-r-mode ess-r-flymake ess-r-xref ess-trns
ess-r-package ess-r-completion ess-roxy ess-r-syntax ess-rd hideshow
ess-s-lang ess-help ess-mode ess-inf ess cape geiser-mode geiser-xref
geiser-compile geiser-guile info-look transient geiser-debug geiser-repl
geiser-image geiser-capf geiser-doc geiser-menu geiser-autodoc
geiser-edit etags fileloop geiser-completion geiser-eval
geiser-connection tq geiser-syntax geiser-log geiser-popup scheme
whitespace lua-mode sql-indent sql view eglot tree-widget
external-completion jsonrpc diff ert debug backtrace ruby-mode conf-mode
org-goto cl-print ess-tracebug ess-utils ess-custom tramp trampver
tramp-integration tramp-message tramp-compat tramp-loaddefs ob-ditaa
org-colview org-crypt org-ctags org-habit org-mouse org-plot
org-protocol misearch multi-isearch dired-aux dired-x mhtml-mode
css-mode color htmlize oc-csl citeproc citeproc-itemgetters parsebib
citeproc-cite citeproc-biblatex citeproc-bibtex citeproc-subbibs
citeproc-sort citeproc-name citeproc-formatters citeproc-proc
citeproc-disamb citeproc-itemdata citeproc-generic-elements
citeproc-macro citeproc-choose citeproc-date citeproc-number rst
citeproc-context citeproc-prange citeproc-style citeproc-locale
citeproc-term f citeproc-rt citeproc-lib citeproc-s s let-alist queue
dash ox-texinfo ox-md ox-odt rng-loc rng-uri rng-parse rng-match rng-dt
rng-util rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex
ox-icalendar org-agenda ox-html table ox-ascii ox-publish ox org-attach
doric-plum-theme doric-pine-theme doric-obsidian-theme doric-fire-theme
doric-dark-theme doric-wind-theme doric-oak-theme doric-marble-theme
doric-light-theme doric-earth-theme doric-cherry-theme ef-winter-theme
ef-tritanopia-dark-theme ef-trio-dark-theme ef-symbiosis-theme
ef-rosa-theme ef-owl-theme ef-night-theme ef-melissa-dark-theme
ef-maris-dark-theme ef-elea-dark-theme ef-duo-dark-theme ef-dream-theme
ef-deuteranopia-dark-theme ef-dark-theme ef-cherie-theme ef-bio-theme
ef-autumn-theme ef-tritanopia-light-theme ef-trio-light-theme
ef-summer-theme ef-spring-theme ef-reverie-theme ef-melissa-light-theme
ef-maris-light-theme ef-light-theme ef-kassio-theme ef-frost-theme
ef-elea-light-theme ef-eagle-theme ef-duo-light-theme
ef-deuteranopia-light-theme ef-day-theme ef-cyprus-theme
ef-arbutus-theme ef-themes vertico-directory char-fold vertico-sort
sgml-mode facemenu js c-ts-common imenu preview tex-mode font-latex
latex latex-flymake tex-ispell tex-style tex texmathp auctex disp-table
display-fill-column-indicator display-line-numbers hi-lock jinx comp-run
compile-angel marginalia corfu-history corfu vertico-multiform vertico
paredit edmacro kmacro openwith hl-todo ob-fennel fennel-proto-repl
fennel-mode inf-lisp xref diff-hl log-view log-edit add-log pcvs-util
vc-dir ewoc pdf-loader doric-water-theme doric-themes orderless mb-depth
package-vc vc lisp-mnt finder-inf fortune comp comp-cstr comp-common
delsel cap-words superword subword saveplace ob-org ob-lisp org-clock
ob-plantuml ob-lua ob-dot ob-latex ob-java ob-R ob-C cc-mode cc-fonts
cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs
ob-scheme geiser-impl help-fns radix-tree geiser-custom geiser-base
geiser ob-clojure ob-makefile ob-sqlite ob-sql ob-shell shell ob-python
python compat flymake project compile warnings autorevert savehist
bug-reference notmuch notmuch-tree notmuch-jump notmuch-hello
notmuch-show notmuch-print notmuch-crypto notmuch-mua notmuch-message
notmuch-draft notmuch-maildir-fcc notmuch-address notmuch-company
notmuch-parser notmuch-wash coolj goto-addr icalendar diary-lib
diary-loaddefs notmuch-tag crm notmuch-lib notmuch-version
notmuch-compat hl-line ls-lisp holidays holiday-loaddefs elfeed-link
elfeed-show elfeed-search elfeed-csv elfeed elfeed-curl elfeed-log
xml-query bookmark elfeed-db elfeed-lib vc-git diff-mode easy-mmode
files-x vc-dispatcher org-indent image-file image-converter oc-basic
cl-extra help-mode ffap org-element org-persist org-id org-refile
avl-tree generator ol-eww eww track-changes vtable url-queue mm-url
ol-rmail ol-mhe ol-irc ol-info ol-gnus nnselect gnus-art mm-uu mml2015
mm-view mml-smime smime gnutls dig gnus-sum shr pixel-fill kinsoku
url-file svg dom gnus-group gnus-undo gnus-start gnus-dbus dbus xml
gnus-cloud nnimap nnmail mail-source utf7 nnoo parse-time gnus-spec
gnus-int gnus-range message sendmail yank-media puny rfc822 mml mml-sec
epa derived epg rfc6068 epg-config mm-decode mm-bodies mm-encode
mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev gmm-utils
mailheader gnus-win gnus nnheader gnus-util text-property-search
mail-utils range mm-util mail-prsvr ol-docview doc-view filenotify
jka-compr image-mode exif dired dired-loaddefs ol-bibtex bibtex iso8601
ol-bbdb ol-w3m ol-doi org-link-doi org ob ob-tangle ob-ref ob-lob
ob-table ob-exp org-macro org-src sh-script smie treesit executable
ob-comint org-element-ast inline org-pcomplete pcomplete comint ansi-osc
ansi-color ring org-list org-footnote org-faces org-entities time-date
noutline outline ob-emacs-lisp ob-core ob-eval org-cycle org-table ol
org-fold org-fold-core org-keys oc org-loaddefs thingatpt find-func
cal-menu calendar cal-loaddefs org-version org-compat org-macs
format-spec cus-edit pp cus-start cus-load wid-edit
almost-mono-themes-autoloads auctex-autoloads tex-site avy-autoloads
bbdb-autoloads blacken-autoloads bnf-mode-autoloads cape-autoloads
challenger-deep-theme-autoloads chess-autoloads cider-autoloads
citar-autoloads citeproc-autoloads clojure-mode-autoloads
code-cells-autoloads compile-angel-autoloads corfu-autoloads
csv-mode-autoloads diff-hl-autoloads doric-themes-autoloads
drepl-autoloads comint-mime-autoloads ebnf-mode-autoloads
edit-indirect-autoloads editorconfig-autoloads ef-themes-autoloads
elfeed-tube-mpv-autoloads elfeed-tube-autoloads aio-autoloads
elfeed-autoloads emms-autoloads ess-autoloads f-autoloads
faceup-autoloads fennel-mode-autoloads geiser-guile-autoloads
geiser-autoloads gptel-autoloads graphviz-dot-mode-autoloads
hl-todo-autoloads htmlize-autoloads jinx-autoloads json-mode-autoloads
rx json-snatcher-autoloads kotlin-mode-autoloads magit-autoloads pcase
magit-section-autoloads llama-autoloads cond-let-autoloads
marginalia-autoloads markdown-mode-autoloads mathjax-autoloads
mentor-autoloads async-autoloads modus-themes-autoloads mpv-autoloads
openwith-autoloads orderless-autoloads org-drill-autoloads org-autoloads
paredit-autoloads parsebib-autoloads parseedn-autoloads
parseclj-autoloads password-store-autoloads pdf-tools-autoloads
persist-autoloads plantuml-mode-autoloads deflate-autoloads
dash-autoloads queue-autoloads rainbow-mode-autoloads s-autoloads
sesman-autoloads slime-autoloads macrostep-autoloads spinner-autoloads
sql-indent-autoloads sqlup-mode-autoloads string-inflection-autoloads
swift-mode-autoloads tablist-autoloads telega-autoloads tempel-autoloads
transient-autoloads url-scgi-autoloads vertico-autoloads
visual-fill-column-autoloads vterm-autoloads which-key-autoloads info
with-editor-autoloads xml-rpc-autoloads yaml-mode-autoloads package
browse-url xdg 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 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 lcms2
multi-tty make-network-process tty-child-frames native-compile emacs)

Memory information:
((conses 16 4595376 2544541) (symbols 48 78796 38) (strings 32 571452 362950)
 (string-bytes 1 17803235) (vectors 16 180853) (vector-slots 8 2967048 3103490)
 (floats 8 3472 17795) (intervals 56 349864 14917) (buffers 1064 96))

-- 
"Programming reliably -- must be an activity of an undeniably
mathematical nature […] You see, mathematics is about thinking, and
doing mathematics is always trying to think as well as possible."
--- Edsger W. Dijkstra, 1981

Rudolf Adamkovič <rudolf <at> adamkovic.org> [he/him]
http://adamkovic.org

Message #8 received at 79425 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: Rudolf Adamkovič <rudolf <at> adamkovic.org>
Cc: 79425 <at> debbugs.gnu.org
Subject: Re: bug#79425: 31.0.50; `subst-char-in-string' crashes
Date: Wed, 10 Sep 2025 23:51:52 +0200

On Wed, 10 Sep 2025 23:24:13 +0200 Rudolf Adamkovič <rudolf <at> adamkovic.org> wrote:

> I am trying to export an Org mode file with citations using Emacs
> compiled from `master' on NS.  The export crashes in `citeproc-el', a
> 3rd-party library used by Org to format citations.  I reported the
> problem upstream [1], and it seems to be a problem with Emacs itself.
>
> [1] https://github.com/andras-simonyi/citeproc-el/issues/181
>
> REPRODUCTION STEPS:
>
>   1. Checkout Emacs from Git commit `66ef930ebea'.
>   1. Run `emacs -Q' on NS (MacOS 15.5).
>   2. Evaluate `(subst-char-in-string 39 700 "D'Arcus" t)' in *scratch*.
>
> UNEXPECTED ERROR:
>
>   Debugger entered--Lisp error: (error "Attempt to store non-byte value into unibyte string")
>     aset("D'Arcus" 1 700)

This is due to this change:

commit 308e3ab1dbd9633b843541af55d77c82b725df02
Author:     Mattias Engdegård <mattias.engdegard <at> gmail.com>
Commit:     Mattias Engdegård <mattias.engdegard <at> gmail.com>
CommitDate: Sun Aug 24 10:28:27 2025 +0200

    Disallow string data resizing (bug#79784)
    
    Only allow string mutation that is certain not to require string data to
    be resized and reallocated: writing bytes into a unibyte string, and
    changing ASCII to ASCII in a multibyte string.
    
    This ensures that mutation will never transform a unibyte string to
    multibyte, that the size of a string in bytes never changes, and that
    the byte offsets of characters remain the same.  Most importantly, it
    removes a long-standing obstacle to reform of string representation and
    allow for future performance improvements.
    
    * src/data.c (Faset): Disallow resizing string mutation.
    [...]

Steve Berman

Message #11 received at 79425 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: rudolf <at> adamkovic.org, 79425 <at> debbugs.gnu.org
Subject: Re: bug#79425: 31.0.50; `subst-char-in-string' crashes
Date: Thu, 11 Sep 2025 07:48:09 +0300

tags 79425 notabug
thanks

> Cc: 79425 <at> debbugs.gnu.org
> Date: Wed, 10 Sep 2025 23:51:52 +0200
> From:  Stephen Berman via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> On Wed, 10 Sep 2025 23:24:13 +0200 Rudolf Adamkovič <rudolf <at> adamkovic.org> wrote:
> 
> > I am trying to export an Org mode file with citations using Emacs
> > compiled from `master' on NS.  The export crashes in `citeproc-el', a
> > 3rd-party library used by Org to format citations.  I reported the
> > problem upstream [1], and it seems to be a problem with Emacs itself.
> >
> > [1] https://github.com/andras-simonyi/citeproc-el/issues/181
> >
> > REPRODUCTION STEPS:
> >
> >   1. Checkout Emacs from Git commit `66ef930ebea'.
> >   1. Run `emacs -Q' on NS (MacOS 15.5).
> >   2. Evaluate `(subst-char-in-string 39 700 "D'Arcus" t)' in *scratch*.
> >
> > UNEXPECTED ERROR:
> >
> >   Debugger entered--Lisp error: (error "Attempt to store non-byte value into unibyte string")
> >     aset("D'Arcus" 1 700)
> 
> This is due to this change:
> 
> commit 308e3ab1dbd9633b843541af55d77c82b725df02
> Author:     Mattias Engdegård <mattias.engdegard <at> gmail.com>
> Commit:     Mattias Engdegård <mattias.engdegard <at> gmail.com>
> CommitDate: Sun Aug 24 10:28:27 2025 +0200
> 
>     Disallow string data resizing (bug#79784)
>     
>     Only allow string mutation that is certain not to require string data to
>     be resized and reallocated: writing bytes into a unibyte string, and
>     changing ASCII to ASCII in a multibyte string.
>     
>     This ensures that mutation will never transform a unibyte string to
>     multibyte, that the size of a string in bytes never changes, and that
>     the byte offsets of characters remain the same.  Most importantly, it
>     removes a long-standing obstacle to reform of string representation and
>     allow for future performance improvements.
>     
>     * src/data.c (Faset): Disallow resizing string mutation.
>     [...]

Indeed, and so this is not a bug, but a deliberate change, documented
in NEWS.

(It is also wrong to say "crashes" when actually Emacs signals an
error.)

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Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.