GNU bug report logs - #70824
29.3; Run time error in `dabbrev-completion'

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#70824: closed (29.3; Run time error in `dabbrev-completion')
Date: Sat, 25 May 2024 07:36:01 +0000

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

Your message dated Sat, 25 May 2024 10:34:55 +0300
with message-id <86ed9q1h0g.fsf <at> gnu.org>
and subject line Re: bug#70824: 29.3; Run time error in `dabbrev-completion'
has caused the debbugs.gnu.org bug report #70824,
regarding 29.3; Run time error in `dabbrev-completion'
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
70824: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=70824
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Matt Armstrong <matt <at> rfc20.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.3; Run time error in `dabbrev-completion'
Date: Tue, 7 May 2024 12:19:43 -0700

I'm in a state where `dabbrev--last-buffer' is set to #<killed buffer>,
which confuses the `dabbrev-completion' command as shown by the 
backtrace below.

If I find a way to reproduce I will follow up with that.

I suspect that dabbrev.el should use `(buffer-live-p
dabbrev--last-buffer)' instead of checking for non-nil.

First, the value of dabbrev--last-buffer:

    dabbrev--last-buffer is a variable defined in ‘dabbrev.el’.
    Its value is #<killed buffer>
    Not documented as a variable.

Second, what happens when I run `dabbrev-completion':

Debugger entered--Lisp error: (error "Selecting deleted buffer")
  set-buffer(#<killed buffer>)
  (progn (set-buffer dabbrev--last-buffer))
  (if dabbrev--last-buffer (progn (set-buffer dabbrev--last-buffer)))
  (save-excursion (if dabbrev--last-buffer (progn (set-buffer 
dabbrev--last-buffer))) (or (and (not dabbrev-search-these-buffers-only) 
(>= direction 0) (setq dabbrev--last-direction (min 1 direction)) 
(dabbrev--try-find abbrev t (max 1 direction) ignore-case)) (and (or 
(not dabbrev-search-these-buffers-only) dabbrev--last-buffer) (<= 
direction 0) (setq dabbrev--last-direction -1) (dabbrev--try-find abbrev 
nil (max 1 (- direction)) ignore-case)) (progn (setq 
dabbrev--last-direction -1) (if dabbrev--last-buffer nil (if 
dabbrev--friend-buffer-list nil (setq dabbrev--friend-buffer-list 
(dabbrev--make-friend-buffer-list)) (setq dabbrev--progress-reporter 
(make-progress-reporter "Scanning for dabbrevs..." (- ...) 0 0 1 1.5)))) 
(let ((file-name (buffer-file-name)) file-name-buffer) (unwind-protect 
(progn (if file-name (progn ... ... ...)) (let (expansion) (while ... 
... ... ... ... ...) (progress-reporter-done dabbrev--progress-reporter) 
expansion)) (if (buffer-live-p file-name-buffer) (progn (kill-buffer 
file-name-buffer))) (setq dabbrev--friend-buffer-list (seq-filter 
#'buffer-live-p dabbrev--friend-buffer-list)))))))
  dabbrev--find-expansion("p" -1 t)
  dabbrev--find-all-expansions("p" t)
  #f(compiled-function (s p a) #<bytecode -0x1773fde4def7ae30>)(#("p" 0 
1 (fontified t)) nil (boundaries . ""))
  completion-boundaries(#("p" 0 1 (fontified t)) #f(compiled-function 
(s p a) #<bytecode -0x1773fde4def7ae30>) nil "")
  completion-basic-try-completion(#("p" 0 1 (fontified t)) 
#f(compiled-function (s p a) #<bytecode -0x1773fde4def7ae30>) nil 1)
  #f(compiled-function (style) #<bytecode -0x1bb324416e7d7fbf>)(basic)
  completion--some(#f(compiled-function (style) #<bytecode 
-0x1bb324416e7d7fbf>) (basic partial-completion emacs22))
  completion--nth-completion(1 #("p" 0 1 (fontified t)) 
#f(compiled-function (s p a) #<bytecode -0x1773fde4def7ae30>) nil 1 
(metadata (cycle-sort-function . identity) (category . dabbrev)))
  completion-try-completion(#("p" 0 1 (fontified t)) 
#f(compiled-function (s p a) #<bytecode -0x1773fde4def7ae30>) nil 1 
(metadata (cycle-sort-function . identity) (category . dabbrev)))
  completion--do-completion(#<marker at 531 in persist.rs> 532)
  completion--in-region-1(#<marker at 531 in persist.rs> 532)
  #f(compiled-function (start end collection predicate) #<bytecode 
-0x16fb47f8fb6a4d3d>)(#<marker at 531 in persist.rs> 532 
#f(compiled-function (s p a) #<bytecode -0x1773fde4def7ae30>) nil)
  apply(#f(compiled-function (start end collection predicate) 
#<bytecode -0x16fb47f8fb6a4d3d>) (#<marker at 531 in persist.rs> 532 
#f(compiled-function (s p a) #<bytecode -0x1773fde4def7ae30>) nil))
  #f(compiled-function (funs global args) #<bytecode 
-0x73c1f01704730a2>)(nil nil (#<marker at 531 in persist.rs> 532 
#f(compiled-function (s p a) #<bytecode -0x1773fde4def7ae30>) nil))
  completion--in-region(#<marker at 531 in persist.rs> 532 
#f(compiled-function (s p a) #<bytecode -0x1773fde4def7ae30>) nil)
  completion-in-region(#<marker at 531 in persist.rs> 532 
#f(compiled-function (s p a) #<bytecode -0x1773fde4def7ae30>) nil)
  completion-at-point()
  dabbrev-completion(nil)
  funcall-interactively(dabbrev-completion nil)
  command-execute(dabbrev-completion)




In GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41,
cairo version 1.18.0)
System Description: Debian GNU/Linux 12 (bookworm)

Configured using:
 'configure
 --prefix=/nix/store/m88zm8z7qrby6zlnq32z35nmn89jdzkl-emacs-pgtk-29.3
 --disable-build-details --with-modules --with-pgtk
 --with-compress-install --with-toolkit-scroll-bars
 --with-native-compilation --without-imagemagick --without-small-ja-dic
 --with-tree-sitter --without-xinput2 --with-xwidgets --with-dbus
 --with-selinux'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER
PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP XIM XWIDGETS GTK3 ZLIB

Important settings:
  value of $EMACSLOADPATH:
  value of $EMACSNATIVELOADPATH:
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: ELisp/l

Minor modes in effect:
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  magit-auto-revert-mode: t
  shell-dirtrack-mode: t
  msb-mode: t
  display-time-mode: t
  flyspell-mode: t
  server-mode: t
  auto-insert-mode: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
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  electric-pair-mode: t
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  tooltip-mode: t
  global-eldoc-mode: t
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  font-lock-mode: t
  blink-cursor-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  temp-buffer-resize-mode: t

Load-path shadows:
/home/matt/.nix-profile/share/emacs/site-lisp/cmake-mode hides 
/home/matt/.config/emacs/elpa/cmake-mode-3.28.1/cmake-mode
~/env/elisp/ol-notmuch hides 
/home/matt/.config/emacs/elpa/ol-notmuch-2.0.1/ol-notmuch
/nix/store/qm3ihp915s71a5sdvg6w7ag5vr295qmi-emacs-packages-deps/share/emacs/site-lisp/site-start 
hides 
/nix/store/m88zm8z7qrby6zlnq32z35nmn89jdzkl-emacs-pgtk-29.3/share/emacs/site-lisp/site-start
/home/matt/.config/emacs/elpa/project-0.10.0/project hides 
/nix/store/m88zm8z7qrby6zlnq32z35nmn89jdzkl-emacs-pgtk-29.3/share/emacs/29.3/lisp/progmodes/project

Features:
(shadow sort mail-extr emacsbug jka-compr cl-print cus-start cus-load
shortdoc dabbrev vc-hg vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs
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magit-obsolete 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 diff git-commit log-edit message sendmail yank-media puny
rfc822 mml mml-sec epa derived epg rfc6068 epg-config gnus-util
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr mailabbrev mail-utils gmm-utils mailheader
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meow-autoloads modus-themes-autoloads nix-mode-autoloads
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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 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 449923 81499)
 (symbols 48 28929 27)
 (strings 32 104412 4026)
 (string-bytes 1 3615216)
 (vectors 16 65301)
 (vector-slots 8 1514110 53758)
 (floats 8 396 470)
 (intervals 56 4575 36)
 (buffers 984 32))

[Message part 3 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: Matt Armstrong <matt <at> rfc20.org>
Cc: 70824-done <at> debbugs.gnu.org
Subject: Re: bug#70824: 29.3; Run time error in `dabbrev-completion'
Date: Sat, 25 May 2024 10:34:55 +0300

> Date: Tue, 7 May 2024 12:19:43 -0700
> From:  Matt Armstrong via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> I'm in a state where `dabbrev--last-buffer' is set to #<killed buffer>,
> which confuses the `dabbrev-completion' command as shown by the 
> backtrace below.
> 
> If I find a way to reproduce I will follow up with that.
> 
> I suspect that dabbrev.el should use `(buffer-live-p
> dabbrev--last-buffer)' instead of checking for non-nil.

Thanks, I added the buffer-live-p tests where appropriate in
dabbrev.el and installed the changes on the master branch.  I'm now
boldly closing this bug.

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