Package: emacs;
Reported by: dick <dick.r.chiang <at> gmail.com>
Date: Sat, 12 Jun 2021 23:01:02 UTC
Severity: normal
Found in version 28.0.50
Done: Stefan Monnier <monnier <at> iro.umontreal.ca>
Bug is archived. No further changes may be made.
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bug-gnu-emacs <at> gnu.org:bug#48990; Package emacs.
(Sat, 12 Jun 2021 23:01:02 GMT) Full text and rfc822 format available.dick <dick.r.chiang <at> gmail.com>:bug-gnu-emacs <at> gnu.org.
(Sat, 12 Jun 2021 23:01:02 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: dick <dick.r.chiang <at> gmail.com> To: bug-gnu-emacs <at> gnu.org Subject: 28.0.50; buffer-local and threads malarkey Date: Sat, 12 Jun 2021 19:00:27 -0400
[Message part 1 (text/plain, inline)]
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
[usurped.el (application/emacs-lisp, attachment)]
[Message part 3 (text/plain, inline)]
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 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/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 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/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 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/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 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/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 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bug-gnu-emacs <at> gnu.org:bug#48990; Package emacs.
(Sun, 13 Jun 2021 07:56:01 GMT) Full text and rfc822 format available.Message #8 received at 48990 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: dick <dick.r.chiang <at> gmail.com>, Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: 48990 <at> debbugs.gnu.org Subject: Re: bug#48990: 28.0.50; buffer-local and threads malarkey Date: Sun, 13 Jun 2021 10:55:17 +0300
> From: dick <dick.r.chiang <at> 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-gnu-emacs <at> gnu.org:bug#48990; Package emacs.
(Wed, 29 Sep 2021 03:29:01 GMT) Full text and rfc822 format available.Message #11 received at 48990 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: dick <dick.r.chiang <at> gmail.com> Cc: 48990 <at> debbugs.gnu.org Subject: Re: bug#48990: 28.0.50; buffer-local and threads malarkey Date: Tue, 28 Sep 2021 23:28:47 -0400
> # 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-gnu-emacs <at> gnu.org:bug#48990; Package emacs.
(Wed, 29 Sep 2021 11:52:01 GMT) Full text and rfc822 format available.Message #14 received at 48990 <at> debbugs.gnu.org (full text, mbox):
From: dick <dick.r.chiang <at> gmail.com> To: Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: 48990 <at> debbugs.gnu.org Subject: Re: bug#48990: 28.0.50; buffer-local and threads malarkey Date: Wed, 29 Sep 2021 07:51:46 -0400
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-gnu-emacs <at> gnu.org:bug#48990; Package emacs.
(Wed, 29 Sep 2021 12:50:02 GMT) Full text and rfc822 format available.Message #17 received at 48990 <at> debbugs.gnu.org (full text, mbox):
From: dick <dick.r.chiang <at> gmail.com> To: Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: 48990 <at> debbugs.gnu.org Subject: Re: bug#48990: 28.0.50; buffer-local and threads malarkey Date: Wed, 29 Sep 2021 08:49:50 -0400
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.
Stefan Monnier <monnier <at> iro.umontreal.ca>:dick <dick.r.chiang <at> gmail.com>:Message #22 received at 48990-done <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: dick <dick.r.chiang <at> gmail.com> Cc: 48990-done <at> debbugs.gnu.org Subject: Re: bug#48990: 28.0.50; buffer-local and threads malarkey Date: Sat, 12 Feb 2022 15:28:56 -0500
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-gnu-emacs <at> gnu.org:bug#48990; Package emacs.
(Sun, 13 Feb 2022 19:19:03 GMT) Full text and rfc822 format available.Message #25 received at 48990-done <at> debbugs.gnu.org (full text, mbox):
From: dick <dick.r.chiang <at> gmail.com> To: Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: 48990-done <at> debbugs.gnu.org Subject: Re: bug#48990: 28.0.50; buffer-local and threads malarkey Date: Sat, 12 Feb 2022 17:58:17 -0500
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.
Debbugs Internal Request <help-debbugs <at> gnu.org>
to internal_control <at> debbugs.gnu.org.
(Mon, 14 Mar 2022 11:24:11 GMT) Full text and rfc822 format available.
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