GNU bug report logs - #50246
28.0.50; persist.el will incorrectly serialize a symbol's value... sometimes

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

From: Felipe Lema <felipelema <at> mortemale.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50;
 persist.el will incorrectly serialize a symbol's value... sometimes
Date: Sun, 29 Aug 2021 00:01:43 -0400

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

Hello, there

I've been using persist.el for quite a while (through frecentf.el from MELPA) and it seems that sometimes persist will truncate hash tables (as described in `print-length` 's documentation, using ellipsis).
This ends up in Emacs erroring out at startup due to the serialization being un-hash-table-ish (due to the (quote ...) ).

Unfortunately, I haven't been able to reproduce this problem consistently.

However, I do have a fix for this problem and I've attached it as a patch. It's basically ensuring that printing / serializing a symbol uses the safest configuration possible (no limit for elements, no problems with special characters such as '\0', etc).

The `let` bindings were developed by experience and I'm already using this "safe serialization" config in another package I maintain ( session-async.el ).

Thanks y'all for maintaining Emacs. It's a very useful tool and I use it every day at work.

Felipe

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, cairo version 1.15.10)
 of 2021-08-28 built on felipe-ThinkPad-X200
Repository revision: 692da8c6a82f8de376a2eec9304773b3e85205f3
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Trisquel GNU/Linux Etiona (9.0)

Configured using:
 'configure --without-native-compilation --with-x-toolkit=no
 --without-xpm --without-gnutls'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GSETTINGS HARFBUZZ JPEG LCMS2 LIBXML2
MODULES NOTIFY INOTIFY OLDXMENU PDUMPER PNG SECCOMP SOUND THREADS TIFF
X11 XDBE XIM ZLIB

Important settings:
  value of $LC_ALL: 
  value of $LC_MESSAGES: en_DK.UTF-8
  value of $LC_MONETARY: en_DK.UTF-8
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/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-faces hides /usr/local/share/emacs/28.0.50/lisp/org/org-faces
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-habit hides /usr/local/share/emacs/28.0.50/lisp/org/org-habit
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-archive hides /usr/local/share/emacs/28.0.50/lisp/org/org-archive
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ob-comint hides /usr/local/share/emacs/28.0.50/lisp/org/ob-comint
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ol-eww hides /usr/local/share/emacs/28.0.50/lisp/org/ol-eww
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-pcomplete hides /usr/local/share/emacs/28.0.50/lisp/org/org-pcomplete
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ox-latex hides /usr/local/share/emacs/28.0.50/lisp/org/ox-latex
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ob-stan hides /usr/local/share/emacs/28.0.50/lisp/org/ob-stan
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ob-ditaa hides /usr/local/share/emacs/28.0.50/lisp/org/ob-ditaa
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-colview hides /usr/local/share/emacs/28.0.50/lisp/org/org-colview
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ob-latex hides /usr/local/share/emacs/28.0.50/lisp/org/ob-latex
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-duration hides /usr/local/share/emacs/28.0.50/lisp/org/org-duration
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ob-eval hides /usr/local/share/emacs/28.0.50/lisp/org/ob-eval
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ol-w3m hides /usr/local/share/emacs/28.0.50/lisp/org/ol-w3m
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ob-io hides /usr/local/share/emacs/28.0.50/lisp/org/ob-io
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ob-asymptote hides /usr/local/share/emacs/28.0.50/lisp/org/ob-asymptote
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ob-ledger hides /usr/local/share/emacs/28.0.50/lisp/org/ob-ledger
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-keys hides /usr/local/share/emacs/28.0.50/lisp/org/org-keys
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-compat hides /usr/local/share/emacs/28.0.50/lisp/org/org-compat
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ob-java hides /usr/local/share/emacs/28.0.50/lisp/org/ob-java
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-entities hides /usr/local/share/emacs/28.0.50/lisp/org/org-entities
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-install hides /usr/local/share/emacs/28.0.50/lisp/org/org-install
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ox-icalendar hides /usr/local/share/emacs/28.0.50/lisp/org/ox-icalendar
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/ob-lob hides /usr/local/share/emacs/28.0.50/lisp/org/ob-lob
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-feed hides /usr/local/share/emacs/28.0.50/lisp/org/org-feed
/home/felipe/.emacs.d/.local/straight/build-28.0.50/org/org-mouse hides /usr/local/share/emacs/28.0.50/lisp/org/org-mouse

Features:
(shadow sort disp-table whitespace flycheck-popup-tip
evil-collection-popup popup vi-tilde-fringe display-line-numbers gcmh
hl-line winner paren smartparens-config smartparens-text smartparens
ws-butler undo-fu-session undo-fu flycheck-package package-lint
evil-collection-finder finder finder-inf lisp-mnt
evil-collection-flycheck flycheck mail-extr emacsbug sendmail mule-util
vertico-repeat cursor-sensor evil-collection-which-key which-key
better-jumper company-capf company vertico orderless marginalia
evil-goggles pulse color evil-easymotion avy evil-escape evil-snipe
org-capture org-agenda org-refile evil-collection-magit-todos
magit-todos pcre2el rxt re-builder hl-todo async evil-collection-grep
grep evil-collection-compile compile orgit smartparens-org org-yt
org-element avl-tree generator org ob ob-tangle ob-ref ob-lob ob-table
ob-exp org-macro org-footnote org-src ob-comint org-pcomplete org-list
org-faces org-entities noutline outline org-version ob-emacs-lisp
ob-core ob-eval org-table ol org-keys oc org-cite org-compat org-macs
org-loaddefs find-func evil-collection-calendar cal-menu calendar
cal-loaddefs github-review ghub-graphql treepy gsexp ghub url-http
url-gw nsm url-auth gnutls deferred a evil-collection-magit
magit-autoloads magit-submodule magit-obsolete magit-popup 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 evil-collection-imenu imenu magit-diff
smerge-mode diff evil-collection-diff-mode diff-mode magit-core
magit-autorevert magit-margin magit-transient magit-process magit-mode
core-packages package browse-url url url-proxy url-privacy url-expand
url-methods url-history url-cookie url-domsuf url-util mailcap
url-handlers url-parse url-vars git-commit transient format-spec
evil-collection-log-edit log-edit message rmc puny evil-collection-dired
dired dired-loaddefs rfc822 mml mml-sec evil-collection-epa epa epg
epg-config gnus-util rmail rmail-loaddefs auth-source password-cache
json map text-property-search time-date mm-decode mm-bodies mm-encode
mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr
mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log magit-git
magit-section magit-utils crm eieio eieio-core eieio-loaddefs
with-editor doom-snippets doom-snippets-lib yasnippet
evil-collection-elisp-mode evil-collection-custom cus-edit cus-start
cus-load evil-collection-comint evil-collection annalist elisp-mode
savehist recentf tree-widget wid-edit server autorevert filenotify
dtrt-indent doom-themes-ext-org solaire-mode face-remap doom-one-theme
doom-themes doom-themes-base doom-modeline doom-modeline-segments
doom-modeline-env doom-modeline-core shrink-path rx f s all-the-icons
all-the-icons-faces data-material data-weathericons data-octicons
data-fileicons data-faicons data-alltheicons dash persp-mode let-alist
evil evil-integration evil-maps evil-commands reveal flyspell ispell
evil-jumps evil-command-window evil-types evil-search shell pcomplete
comint ansi-color evil-macros evil-repeat evil-states evil-core advice
evil-common windmove calc calc-loaddefs calc-macs thingatpt rect
evil-digraphs evil-vars ring derived edmacro kmacro core-editor
core-projects core-ui easy-mmode core-keybinds pp general cl-extra
help-mode seq byte-opt cl-seq use-package-core bytecomp byte-compile
cconv core-modules core core-lib pcase cl-macs gv cl-loaddefs cl-lib
subr-x iso-transl tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd 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 cl-generic 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 charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo x multi-tty make-network-process emacs)

Memory information:
((conses 16 587619 800008)
 (symbols 48 57496 132)
 (strings 32 143994 58963)
 (string-bytes 1 4531494)
 (vectors 16 62829)
 (vector-slots 8 946917 532203)
 (floats 8 953 1827)
 (intervals 56 882 467)
 (buffers 992 11))

[persist-fix.patch (text/x-patch, attachment)]

Message #8 received at 50246 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Felipe Lema <felipelema <at> mortemale.org>
Cc: 50246 <at> debbugs.gnu.org, Phillip Lord <phillip.lord <at> russet.org.uk>
Subject: Re: bug#50246: 28.0.50; persist.el will incorrectly serialize a
 symbol's value... sometimes
Date: Sun, 29 Aug 2021 21:39:08 +0200

Felipe Lema <felipelema <at> mortemale.org> writes:

> The `let` bindings were developed by experience and I'm already using
> this "safe serialization" config in another package I maintain (
> session-async.el ).

Thanks; looks good to me, so I've now applied it to the persist package
(but haven't bumped the version number in case Phillip has other changes
planned).

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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