GNU bug report logs - #79333
31.0.50; Processes (still) aren't actually locked to threads

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

From: Spencer Baugh <sbaugh <at> janestreet.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Processes (still) aren't actually locked to threads
Date: Thu, 28 Aug 2025 15:45:18 -0400

1. emacs -Q
2. Eval this:

(define-advice shell-command-sentinel (:before (process signal))
  (message "process thread: %s, current thread: %s"
           (process-thread process)
           (current-thread)))
(make-thread
 (lambda ()
   (async-shell-command "sleep 2")
   ;; Do nothing.
   (thread-join (make-thread (lambda () (while t (sit-for 1)))))))
(sit-for 3)

3. It hangs due to some thread bug, independent of the main bug I'm
   reporting here.  Just hit C-g.  (Notably, it doesn't hang when run in
   emacs --batch)

4. Observe in *Messages* a message like this:

process thread: #<thread 0x3a25bf60>, current thread: #<thread 0x7f87c009e920>

The sentinel ran in a thread which is not process-thread.

So even after c93be71e45, processes aren't actually locked to threads.

(Once again, I think we should take the opportunity here to delete the
code for locking processes to threads, since IMO it is not useful, and
it is still broken)


In GNU Emacs 31.0.50 (build 88, x86_64-pc-linux-gnu, GTK+ Version
 3.22.30, cairo version 1.15.12) of 2025-08-28 built on igm-qws-u22796a
Repository revision: 1ebb6e8822b5fc635549be14a3d4f2dd6f2d77a4
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Rocky Linux 8.10 (Green Obsidian)

Configured using:
 'configure -C --with-gif=no'

Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG LIBSELINUX
LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM
XINERAMA XINPUT2 XPM XRANDR 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:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr compile comint ansi-osc ansi-color ring emacsbug
lisp-mnt message mailcap yank-media puny dired dired-loaddefs rfc822 mml
mml-sec password-cache epa derived epg rfc6068 epg-config gnus-util
text-property-search time-date subr-x mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils comp-run bytecomp
byte-compile comp-common rx warnings icons cl-loaddefs cl-lib rmc
iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook
vc-hooks lisp-float-type elisp-mode mwheel term/x-win x-win
term/common-win x-dnd touch-screen 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 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 dbusbind inotify dynamic-setting system-font-setting
font-render-setting cairo gtk x-toolkit xinput2 x multi-tty move-toolbar
make-network-process tty-child-frames native-compile emacs)

Memory information:
((conses 16 86231 9338) (symbols 48 6873 0) (strings 32 24499 2161)
 (string-bytes 1 811121) (vectors 16 15629)
 (vector-slots 8 186044 7873) (floats 8 30 1) (intervals 56 275 0)
 (buffers 984 11))

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