Package: emacs;
Reported by: Rahguzar <rahguzar <at> zohomail.eu>
Date: Wed, 13 Mar 2024 21:39:02 UTC
Severity: normal
Found in version 29.2
Done: Eli Zaretskii <eliz <at> gnu.org>
Bug is archived. No further changes may be made.
Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Rahguzar <rahguzar <at> zohomail.eu> To: bug-gnu-emacs <at> gnu.org Subject: 29.2; Image mode can loop due to invalid images Date: Wed, 13 Mar 2024 22:13:55 +0100
Dear Emacs developers, Starting with emacs -Q, evaluate (with-current-buffer (get-buffer-create "*image-mode-test*") (insert (propertize "abc" 'display (list 'image "Definitely not an image."))) (image-mode)) twice. The second time results in an error and pop ups the debugger, with the following text, Debugger entered--Lisp error: (excessive-lisp-nesting 1601) display-images-p() image-mode() major-mode-restore((image-mode image-mode-as-text)) image-mode-to-text() image-mode-as-text() image-mode--display() image-mode() major-mode-restore((image-mode image-mode-as-text)) image-mode-to-text() image-mode-as-text() image-mode--display() image-mode() major-mode-restore((image-mode image-mode-as-text)) image-mode-to-text() image-mode-as-text() image-mode--display() image-mode() ... It is unclear to me why this doesn't happen the first time but I think sequence causing it the second time is as follows: 1. 'image-mode' calls 'major-mode-suspend' when 'major' mode is 'fundamental-mode'. So 'major-mode--suspended' is not set. 2. 'image-mode--display' catches error and call 'image-mode-as-text' which calls 'image-mode-to-text'. 3. 'image-mode-as-text' calls 'major-mode-restore' with '(image-mode image-mode-as-text) as mode to avoid. 4. Since major-mode--suspended was not set in step 1 'major-mode-restore' falls back to 'normal-mode' which calls 'image-mode' causing the loop. I think the simplest way of fixing this is to make sure that 'image-mode' doesn't call 'major-mode-suspend' with 'fundamental-mode' instead calling 'text-mode' or 'special-mode' before calling 'major-mode-suspend' if it starts in 'fundamental-mode'. Thanks, Rahguzar In GNU Emacs 29.2 (build 1, aarch64-redhat-linux-gnu, GTK+ Version 3.24.41, cairo version 1.18.0) of 2024-02-02 built on 4f70ed73c5a14276aae52125608014aa System Description: Fedora Linux Asahi Remix 39 (Thirty Nine) Configured using: 'configure --build=aarch64-redhat-linux --host=aarch64-redhat-linux --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --runstatedir=/run --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-cairo --with-dbus --with-gif --with-gpm=no --with-harfbuzz --with-jpeg --with-json --with-modules --with-native-compilation=aot --with-pgtk --with-png --with-rsvg --with-sqlite3 --with-tiff --with-tree-sitter --with-webp --with-xpm --with-xwidgets build_alias=aarch64-redhat-linux host_alias=aarch64-redhat-linux CC=gcc 'CFLAGS=-DMAIL_USE_LOCKF -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -mbranch-protection=standard -fasynchronous-unwind-tables -fstack-clash-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer ' LDFLAGS=-Wl,-z,relro PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig CXX=g++ 'CXXFLAGS=-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -mbranch-protection=standard -fasynchronous-unwind-tables -fstack-clash-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer '' Configured 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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 xwidget-internal dbusbind inotify dynamic-setting system-font-setting font-render-setting cairo gtk pgtk multi-tty make-network-process native-compile emacs) Memory information: ((conses 16 1947280 182804) (symbols 48 88871 56) (strings 32 823936 14118) (string-bytes 1 19318565) (vectors 16 145143) (vector-slots 8 3823080 197541) (floats 8 2295 1214) (intervals 56 74905 6680) (buffers 984 584))
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