bug#48990: 28.0.50; buffer-local and threads malarkey

bug#48990: 28.0.50; buffer-local and threads malarkey

[dick]

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Seems to be a problem going back to emacs-26.3

# all good
src/emacs -Q --batch -l ./usurped.el

# buffer-local causes let-bound variable to freak out
src/emacs -Q --batch --eval "(setq confuse-thread t)" -l ./usurped.el

# buffer-local causes basic setq to freak out
src/emacs -Q --batch --eval "(setq confuse-main t)" -l ./usurped.el


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In GNU Emacs 28.0.50 (build 69, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10)
 of 2021-06-12 built on dick
Repository revision: 4c6554413d318069239ba83f4f42fa2452801d30
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.4 LTS

Configured using:
 'configure --prefix=/home/dick/.local --with-rsvg=yes --with-xml2=yes
 --enable-profiling 'CFLAGS=-g3 -Og' CPPFLAGS=-DDEBUG_TRACE_MOVE'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON LCMS2
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND
THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB

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

Major mode: Lisp Interaction

Minor modes in effect:
  paredit-mode: t
  show-paren-mode: t
  projectile-mode: t
  flx-ido-mode: t
  override-global-mode: t
  shell-dirtrack-mode: t
  beacon-mode: t
  global-hl-line-mode: t
  winner-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/dick/ESS/lisp/obsolete/ess-swv hides /home/dick/ESS/lisp/ess-swv
/home/dick/ESS/lisp/obsolete/ess-rutils hides /home/dick/ESS/lisp/ess-rutils
/home/dick/ESS/lisp/obsolete/ess-noweb hides /home/dick/ESS/lisp/ess-noweb
/home/dick/ESS/lisp/obsolete/mouseme hides /home/dick/ESS/lisp/mouseme
/home/dick/ESS/lisp/obsolete/ess-mouse hides /home/dick/ESS/lisp/ess-mouse
/home/dick/ESS/lisp/obsolete/ess-noweb-mode hides /home/dick/ESS/lisp/ess-noweb-mode
/home/dick/ESS/lisp/obsolete/make-regexp hides /home/dick/ESS/lisp/make-regexp
/home/dick/ESS/lisp/obsolete/ess-r-a hides /home/dick/ESS/lisp/ess-r-a
/home/dick/ESS/lisp/obsolete/ess-noweb-font-lock-mode hides /home/dick/ESS/lisp/ess-noweb-font-lock-mode
/home/dick/gomacro-mode/gomacro-mode hides /home/dick/.emacs.d/elpa/gomacro-mode-20200326.1103/gomacro-mode
/home/dick/ESS/lisp/julia-mode hides /home/dick/.emacs.d/elpa/julia-mode-20200717.1915/julia-mode
/home/dick/ESS/lisp/julia-mode-latexsubs hides /home/dick/.emacs.d/elpa/julia-mode-20200717.1915/julia-mode-latexsubs
/home/dick/.emacs.d/elpa/hydra-20170924.2259/lv hides /home/dick/.emacs.d/elpa/lv-20191106.1238/lv
/home/dick/org-gcal.el/org-gcal hides /home/dick/.emacs.d/elpa/org-gcal-0.3/org-gcal
/home/dick/.emacs.d/elpa/async-20200113.1745/async-autoloads hides /home/dick/.local/share/emacs/site-lisp/emacs-async/async-autoloads
/home/dick/.emacs.d/elpa/async-20200113.1745/async-bytecomp hides /home/dick/.local/share/emacs/site-lisp/emacs-async/async-bytecomp
/home/dick/.emacs.d/elpa/async-20200113.1745/smtpmail-async hides /home/dick/.local/share/emacs/site-lisp/emacs-async/smtpmail-async
/home/dick/.emacs.d/elpa/async-20200113.1745/dired-async hides /home/dick/.local/share/emacs/site-lisp/emacs-async/dired-async
/home/dick/.emacs.d/elpa/async-20200113.1745/async hides /home/dick/.local/share/emacs/site-lisp/emacs-async/async
/home/dick/.emacs.d/elpa/async-20200113.1745/async-pkg hides /home/dick/.local/share/emacs/site-lisp/emacs-async/async-pkg
/home/dick/.emacs.d/lisp/json hides /home/dick/emacs/lisp/json
/home/dick/.emacs.d/elpa/transient-20210221.2251/transient hides /home/dick/emacs/lisp/transient
/home/dick/.emacs.d/elpa/org-9.4.5/ob-css hides /home/dick/emacs/lisp/org/ob-css
/home/dick/.emacs.d/elpa/org-9.4.5/ox-texinfo hides /home/dick/emacs/lisp/org/ox-texinfo
/home/dick/.emacs.d/elpa/org-9.4.5/org-plot hides /home/dick/emacs/lisp/org/org-plot
/home/dick/.emacs.d/elpa/org-9.4.5/ob-eval hides /home/dick/emacs/lisp/org/ob-eval
/home/dick/.emacs.d/elpa/org-9.4.5/ob-ref hides /home/dick/emacs/lisp/org/ob-ref
/home/dick/.emacs.d/elpa/org-9.4.5/org-crypt hides /home/dick/emacs/lisp/org/org-crypt
/home/dick/.emacs.d/elpa/org-9.4.5/ob-tangle hides /home/dick/emacs/lisp/org/ob-tangle
/home/dick/.emacs.d/elpa/org-9.4.5/ob-asymptote hides /home/dick/emacs/lisp/org/ob-asymptote
/home/dick/.emacs.d/elpa/org-9.4.5/ol-w3m hides /home/dick/emacs/lisp/org/ol-w3m
/home/dick/.emacs.d/elpa/org-9.4.5/ob-hledger hides /home/dick/emacs/lisp/org/ob-hledger
/home/dick/.emacs.d/elpa/org-9.4.5/ob-forth hides /home/dick/emacs/lisp/org/ob-forth
/home/dick/.emacs.d/elpa/org-9.4.5/org-mouse hides /home/dick/emacs/lisp/org/org-mouse
/home/dick/.emacs.d/elpa/org-9.4.5/org-indent hides /home/dick/emacs/lisp/org/org-indent
/home/dick/.emacs.d/elpa/org-9.4.5/org-attach-git hides /home/dick/emacs/lisp/org/org-attach-git
/home/dick/.emacs.d/elpa/org-9.4.5/org-element hides /home/dick/emacs/lisp/org/org-element
/home/dick/.emacs.d/elpa/org-9.4.5/ol-mhe hides /home/dick/emacs/lisp/org/ol-mhe
/home/dick/.emacs.d/elpa/org-9.4.5/org-footnote hides /home/dick/emacs/lisp/org/org-footnote
/home/dick/.emacs.d/elpa/org-9.4.5/ob-stan hides /home/dick/emacs/lisp/org/ob-stan
/home/dick/.emacs.d/elpa/org-9.4.5/ob-perl hides /home/dick/emacs/lisp/org/ob-perl
/home/dick/.emacs.d/elpa/org-9.4.5/org-timer hides /home/dick/emacs/lisp/org/org-timer
/home/dick/.emacs.d/elpa/org-9.4.5/org-table hides /home/dick/emacs/lisp/org/org-table
/home/dick/.emacs.d/elpa/org-9.4.5/org-keys hides /home/dick/emacs/lisp/org/org-keys
/home/dick/.emacs.d/elpa/org-9.4.5/org-colview hides /home/dick/emacs/lisp/org/org-colview
/home/dick/.emacs.d/elpa/org-9.4.5/ol hides /home/dick/emacs/lisp/org/ol
/home/dick/.emacs.d/elpa/org-9.4.5/org-entities hides /home/dick/emacs/lisp/org/org-entities
/home/dick/.emacs.d/elpa/org-9.4.5/org-src hides /home/dick/emacs/lisp/org/org-src
/home/dick/.emacs.d/elpa/org-9.4.5/ob-js hides /home/dick/emacs/lisp/org/ob-js
/home/dick/.emacs.d/elpa/org-9.4.5/org hides /home/dick/emacs/lisp/org/org
/home/dick/.emacs.d/elpa/org-9.4.5/ob-makefile hides /home/dick/emacs/lisp/org/ob-makefile
/home/dick/.emacs.d/elpa/org-9.4.5/ob-io hides /home/dick/emacs/lisp/org/ob-io
/home/dick/.emacs.d/elpa/org-9.4.5/org-refile hides /home/dick/emacs/lisp/org/org-refile
/home/dick/.emacs.d/elpa/org-9.4.5/org-clock hides /home/dick/emacs/lisp/org/org-clock
/home/dick/.emacs.d/elpa/org-9.4.5/ob-dot hides /home/dick/emacs/lisp/org/ob-dot
/home/dick/.emacs.d/elpa/org-9.4.5/ob-exp hides /home/dick/emacs/lisp/org/ob-exp
/home/dick/.emacs.d/elpa/org-9.4.5/org-compat hides /home/dick/emacs/lisp/org/org-compat
/home/dick/.emacs.d/elpa/org-9.4.5/ob-maxima hides /home/dick/emacs/lisp/org/ob-maxima
/home/dick/.emacs.d/elpa/org-9.4.5/ob-C hides /home/dick/emacs/lisp/org/ob-C
/home/dick/.emacs.d/elpa/org-9.4.5/org-tempo hides /home/dick/emacs/lisp/org/org-tempo
/home/dick/.emacs.d/elpa/org-9.4.5/ox-md hides /home/dick/emacs/lisp/org/ox-md
/home/dick/.emacs.d/elpa/org-9.4.5/ob-screen hides /home/dick/emacs/lisp/org/ob-screen
/home/dick/.emacs.d/elpa/org-9.4.5/ob-lua hides /home/dick/emacs/lisp/org/ob-lua
/home/dick/.emacs.d/elpa/org-9.4.5/ob-matlab hides /home/dick/emacs/lisp/org/ob-matlab
/home/dick/.emacs.d/elpa/org-9.4.5/ob-groovy hides /home/dick/emacs/lisp/org/ob-groovy
/home/dick/.emacs.d/elpa/org-9.4.5/ol-docview hides /home/dick/emacs/lisp/org/ol-docview
/home/dick/.emacs.d/elpa/org-9.4.5/ob-ebnf hides /home/dick/emacs/lisp/org/ob-ebnf
/home/dick/.emacs.d/elpa/org-9.4.5/ob-sed hides /home/dick/emacs/lisp/org/ob-sed
/home/dick/.emacs.d/elpa/org-9.4.5/ox-html hides /home/dick/emacs/lisp/org/ox-html
/home/dick/.emacs.d/elpa/org-9.4.5/ob-emacs-lisp hides /home/dick/emacs/lisp/org/ob-emacs-lisp
/home/dick/.emacs.d/elpa/org-9.4.5/ol-bbdb hides /home/dick/emacs/lisp/org/ol-bbdb
/home/dick/.emacs.d/elpa/org-9.4.5/org-macs hides /home/dick/emacs/lisp/org/org-macs
/home/dick/.emacs.d/elpa/org-9.4.5/org-lint hides /home/dick/emacs/lisp/org/org-lint
/home/dick/.emacs.d/elpa/org-9.4.5/org-loaddefs hides /home/dick/emacs/lisp/org/org-loaddefs
/home/dick/.emacs.d/elpa/org-9.4.5/ob-scheme hides /home/dick/emacs/lisp/org/ob-scheme
/home/dick/.emacs.d/elpa/org-9.4.5/org-protocol hides /home/dick/emacs/lisp/org/org-protocol
/home/dick/.emacs.d/elpa/org-9.4.5/ol-eww hides /home/dick/emacs/lisp/org/ol-eww
/home/dick/.emacs.d/elpa/org-9.4.5/ox-beamer hides /home/dick/emacs/lisp/org/ox-beamer
/home/dick/.emacs.d/elpa/org-9.4.5/ob-core hides /home/dick/emacs/lisp/org/ob-core
/home/dick/.emacs.d/elpa/org-9.4.5/org-agenda hides /home/dick/emacs/lisp/org/org-agenda
/home/dick/.emacs.d/elpa/org-9.4.5/ob-plantuml hides /home/dick/emacs/lisp/org/ob-plantuml
/home/dick/.emacs.d/elpa/org-9.4.5/ox-publish hides /home/dick/emacs/lisp/org/ox-publish
/home/dick/.emacs.d/elpa/org-9.4.5/ol-eshell hides /home/dick/emacs/lisp/org/ol-eshell
/home/dick/.emacs.d/elpa/org-9.4.5/ol-rmail hides /home/dick/emacs/lisp/org/ol-rmail
/home/dick/.emacs.d/elpa/org-9.4.5/ob-J hides /home/dick/emacs/lisp/org/ob-J
/home/dick/.emacs.d/elpa/org-9.4.5/ob-abc hides /home/dick/emacs/lisp/org/ob-abc
/home/dick/.emacs.d/elpa/org-9.4.5/ob-awk hides /home/dick/emacs/lisp/org/ob-awk
/home/dick/.emacs.d/elpa/org-9.4.5/ob-gnuplot hides /home/dick/emacs/lisp/org/ob-gnuplot
/home/dick/.emacs.d/elpa/org-9.4.5/ob-sql hides /home/dick/emacs/lisp/org/ob-sql
/home/dick/.emacs.d/elpa/org-9.4.5/ob-python hides /home/dick/emacs/lisp/org/ob-python
/home/dick/.emacs.d/elpa/org-9.4.5/ob-octave hides /home/dick/emacs/lisp/org/ob-octave
/home/dick/.emacs.d/elpa/org-9.4.5/ox-man hides /home/dick/emacs/lisp/org/ox-man
/home/dick/.emacs.d/elpa/org-9.4.5/ol-bibtex hides /home/dick/emacs/lisp/org/ol-bibtex
/home/dick/.emacs.d/elpa/org-9.4.5/org-goto hides /home/dick/emacs/lisp/org/org-goto
/home/dick/.emacs.d/elpa/org-9.4.5/ob-org hides /home/dick/emacs/lisp/org/ob-org
/home/dick/.emacs.d/elpa/org-9.4.5/ob-lob hides /home/dick/emacs/lisp/org/ob-lob
/home/dick/.emacs.d/elpa/org-9.4.5/ob-calc hides /home/dick/emacs/lisp/org/ob-calc
/home/dick/.emacs.d/elpa/org-9.4.5/org-macro hides /home/dick/emacs/lisp/org/org-macro
/home/dick/.emacs.d/elpa/org-9.4.5/ob hides /home/dick/emacs/lisp/org/ob
/home/dick/.emacs.d/elpa/org-9.4.5/ol-info hides /home/dick/emacs/lisp/org/ol-info
/home/dick/.emacs.d/elpa/org-9.4.5/ox-ascii hides /home/dick/emacs/lisp/org/ox-ascii
/home/dick/.emacs.d/elpa/org-9.4.5/ob-clojure hides /home/dick/emacs/lisp/org/ob-clojure
/home/dick/.emacs.d/elpa/org-9.4.5/org-inlinetask hides /home/dick/emacs/lisp/org/org-inlinetask
/home/dick/.emacs.d/elpa/org-9.4.5/ob-vala hides /home/dick/emacs/lisp/org/ob-vala
/home/dick/.emacs.d/elpa/org-9.4.5/ob-ruby hides /home/dick/emacs/lisp/org/ob-ruby
/home/dick/.emacs.d/elpa/org-9.4.5/ob-sass hides /home/dick/emacs/lisp/org/ob-sass
/home/dick/.emacs.d/elpa/org-9.4.5/org-faces hides /home/dick/emacs/lisp/org/org-faces
/home/dick/.emacs.d/elpa/org-9.4.5/org-attach hides /home/dick/emacs/lisp/org/org-attach
/home/dick/.emacs.d/elpa/org-9.4.5/ob-lilypond hides /home/dick/emacs/lisp/org/ob-lilypond
/home/dick/.emacs.d/elpa/org-9.4.5/org-archive hides /home/dick/emacs/lisp/org/org-archive
/home/dick/.emacs.d/elpa/org-9.4.5/ob-shen hides /home/dick/emacs/lisp/org/ob-shen
/home/dick/.emacs.d/elpa/org-9.4.5/org-datetree hides /home/dick/emacs/lisp/org/org-datetree
/home/dick/.emacs.d/elpa/org-9.4.5/org-id hides /home/dick/emacs/lisp/org/org-id
/home/dick/.emacs.d/elpa/org-9.4.5/ob-eshell hides /home/dick/emacs/lisp/org/ob-eshell
/home/dick/.emacs.d/elpa/org-9.4.5/ob-sqlite hides /home/dick/emacs/lisp/org/ob-sqlite
/home/dick/.emacs.d/elpa/org-9.4.5/ob-picolisp hides /home/dick/emacs/lisp/org/ob-picolisp
/home/dick/.emacs.d/elpa/org-9.4.5/org-habit hides /home/dick/emacs/lisp/org/org-habit
/home/dick/.emacs.d/elpa/org-9.4.5/org-ctags hides /home/dick/emacs/lisp/org/org-ctags
/home/dick/.emacs.d/elpa/org-9.4.5/ol-gnus hides /home/dick/emacs/lisp/org/ol-gnus
/home/dick/.emacs.d/elpa/org-9.4.5/ob-java hides /home/dick/emacs/lisp/org/ob-java
/home/dick/.emacs.d/elpa/org-9.4.5/ox-latex hides /home/dick/emacs/lisp/org/ox-latex
/home/dick/.emacs.d/elpa/org-9.4.5/org-pcomplete hides /home/dick/emacs/lisp/org/org-pcomplete
/home/dick/.emacs.d/elpa/org-9.4.5/ob-processing hides /home/dick/emacs/lisp/org/ob-processing
/home/dick/.emacs.d/elpa/org-9.4.5/ox-odt hides /home/dick/emacs/lisp/org/ox-odt
/home/dick/.emacs.d/elpa/org-9.4.5/org-feed hides /home/dick/emacs/lisp/org/org-feed
/home/dick/.emacs.d/elpa/org-9.4.5/ob-ditaa hides /home/dick/emacs/lisp/org/ob-ditaa
/home/dick/.emacs.d/elpa/org-9.4.5/ox-org hides /home/dick/emacs/lisp/org/ox-org
/home/dick/.emacs.d/elpa/org-9.4.5/ob-coq hides /home/dick/emacs/lisp/org/ob-coq
/home/dick/.emacs.d/elpa/org-9.4.5/ob-R hides /home/dick/emacs/lisp/org/ob-R
/home/dick/.emacs.d/elpa/org-9.4.5/ob-fortran hides /home/dick/emacs/lisp/org/ob-fortran
/home/dick/.emacs.d/elpa/org-9.4.5/ob-haskell hides /home/dick/emacs/lisp/org/ob-haskell
/home/dick/.emacs.d/elpa/org-9.4.5/ox-icalendar hides /home/dick/emacs/lisp/org/ox-icalendar
/home/dick/.emacs.d/elpa/org-9.4.5/org-num hides /home/dick/emacs/lisp/org/org-num
/home/dick/.emacs.d/elpa/org-9.4.5/ob-ledger hides /home/dick/emacs/lisp/org/ob-ledger
/home/dick/.emacs.d/elpa/org-9.4.5/ox hides /home/dick/emacs/lisp/org/ox
/home/dick/.emacs.d/elpa/org-9.4.5/org-mobile hides /home/dick/emacs/lisp/org/org-mobile
/home/dick/.emacs.d/elpa/org-9.4.5/org-duration hides /home/dick/emacs/lisp/org/org-duration
/home/dick/.emacs.d/elpa/org-9.4.5/org-list hides /home/dick/emacs/lisp/org/org-list
/home/dick/.emacs.d/elpa/org-9.4.5/ob-latex hides /home/dick/emacs/lisp/org/ob-latex
/home/dick/.emacs.d/elpa/org-9.4.5/ob-ocaml hides /home/dick/emacs/lisp/org/ob-ocaml
/home/dick/.emacs.d/elpa/org-9.4.5/ob-lisp hides /home/dick/emacs/lisp/org/ob-lisp
/home/dick/.emacs.d/elpa/org-9.4.5/ob-mscgen hides /home/dick/emacs/lisp/org/ob-mscgen
/home/dick/.emacs.d/elpa/org-9.4.5/ob-comint hides /home/dick/emacs/lisp/org/ob-comint
/home/dick/.emacs.d/elpa/org-9.4.5/org-capture hides /home/dick/emacs/lisp/org/org-capture
/home/dick/.emacs.d/elpa/org-9.4.5/ob-table hides /home/dick/emacs/lisp/org/ob-table
/home/dick/.emacs.d/elpa/org-9.4.5/ob-shell hides /home/dick/emacs/lisp/org/ob-shell
/home/dick/.emacs.d/elpa/org-9.4.5/ol-irc hides /home/dick/emacs/lisp/org/ol-irc
/home/dick/.emacs.d/elpa/org-9.4.5/org-version hides /home/dick/emacs/lisp/org/org-version
/home/dick/.emacs.d/elpa/hierarchy-20171221.1151/hierarchy hides /home/dick/emacs/lisp/emacs-lisp/hierarchy

Features:
(shadow sort flyspell ispell footnote mail-extr gnus-msg emacsbug paredit-ext
paredit mu4e mu4e-org mu4e-main mu4e-view mu4e-view-gnus gnus-art mm-uu
mml2015 mm-view mml-smime smime dig mu4e-view-common mu4e-headers mu4e-compose
mu4e-context mu4e-draft mu4e-actions rfc2368 smtpmail sendmail mu4e-mark
mu4e-proc mu4e-utils doc-view jka-compr image-mode exif mu4e-lists
mu4e-message flow-fill org-tempo tempo org org-macro org-footnote
org-pcomplete org-list org-faces org-entities org-version ob-R ob-emacs-lisp
ob-ein ein-cell ein-output-area ein-kernel ein-ipdb ein-query ein-events
ein-websocket websocket bindat ein-node ewoc ein-log ein-classes ein-core
request autorevert filenotify ein ein-utils deferred cc-mode cc-fonts cc-guess
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs ob ob-tangle
org-src ob-ref ob-lob ob-table ob-exp ob-comint ob-core ob-eval org-table ol
org-keys org-compat org-macs org-loaddefs find-func cal-menu calendar
cal-loaddefs gnus-sum shr kinsoku svg dom gnus-group gnus-undo gnus-start
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parse-time iso8601 gnus-spec gnus-int gnus-range gnus-win gnus nnheader
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bug#48990: 28.0.50; buffer-local and threads malarkey

[Eli Zaretskii]

> From: dick <dick.r.chiang@gmail.com>
> Date: Sat, 12 Jun 2021 19:00:27 -0400
> 
> # all good
> src/emacs -Q --batch -l ./usurped.el
> 
> # buffer-local causes let-bound variable to freak out
> src/emacs -Q --batch --eval "(setq confuse-thread t)" -l ./usurped.el
> 
> # buffer-local causes basic setq to freak out
> src/emacs -Q --batch --eval "(setq confuse-main t)" -l ./usurped.el

Please show the results you see in the 2 problematic cases, and please
explain what did you expect instead and why.

FWIW, I don't necessarily see anything surprising in the results: you
basically let several threads step on each other's toes by modifying
the same variable with non-deterministic relative timings.  But maybe
I'm missing something, which is why I ask for details.

Or maybe Stefan could show me the light.

bug#48990: 28.0.50; buffer-local and threads malarkey

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

> # buffer-local causes let-bound variable to freak out
> src/emacs -Q --batch --eval "(setq confuse-thread t)" -l ./usurped.el

I get:

    failed in thread#1, var is local-4
    failed in thread#2, var is local-4
    failed in thread#3, var is local-4
    failed in thread#0, var is local-4
    succeeded in thread#4, var is let

which indeed is quite wrong, since the thread let-binds `doomsday` to
"let" and then doesn't mutate it anywhere.

Sounds like a bug in the context switch code.


        Stefan

bug#48990: 28.0.50; buffer-local and threads malarkey

[dick]

Yes.  Incidentally this bug (along with several other thread-related problems)
has been fixed in my fork.

https://github.com/dickmao/commercial-emacs

Perhaps one day soon, I will muster the inner strength to wage the political
battle to land it in GNU Emacs.  Thus far though my nontrivial, wide-ranging
fixes have been met with FUD.

bug#48990: 28.0.50; buffer-local and threads malarkey

[dick]

I'll add [1] that anyone so motivated could just lift the fix from data.c from
Commercial.  GPLv3 is largely gibberish to me, but I believe the salient
aspect is I must at least make my changes available for public consumption
even if I don't have to spoon-feed them.

[1] See how using a web-based issue tracker would have allowed me to edit my
previous response rather than tacking on another message to an annoyingly long
queue?  Brevity, folks.  It's the key to effective communication.

bug#48990: 28.0.50; buffer-local and threads malarkey

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Thanks for the report.

I just pushed a patch to `master` which fixes this bug by replacing the
context switch code with that originally written for `backtrace-eval`,
which already handles those cases (more) correctly.


        Stefan

bug#48990: 28.0.50; buffer-local and threads malarkey

[dick]

Ah, much better, this is the root-node fix I was looking for.

In my defense, I have in my notes (now gibberish) that I considered
overhauling {re,un}bind_for_thread_switch but settled on a less robust,
less intrusive fix at the problem's leaf node.