GNU bug report logs - #57199
29.0.50; Processes spawned by Emacs become zombie after restarting

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

From: Akib Azmain Turja <akib <at> disroot.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; Processes spawned by Emacs become zombie after restarting
Date: Sun, 14 Aug 2022 13:30:26 +0600

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

Some child processes don't terminate when Emacs kills them (e.g. Tor).
So, trying to kill them after restarting Emacs with "restart-emacs"
makes those processes zombie.  So I have to kill Emacs to remove those
zombies.

------------------------------------------------------------------------


In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Guix System

Configured using:
 'configure
 CONFIG_SHELL=/gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8/bin/bash
 SHELL=/gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8/bin/bash
 --prefix=/gnu/store/kbim2zycpr57xyj9dbh8r013srkaaif3-emacs-edge-29.0.50-1.686296b
 --enable-fast-install --with-native-compilation --with-sqlite3
 --with-xinput2 --with-xwidgets --with-modules --with-cairo
 --disable-build-details'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3
THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XINPUT2 XPM XWIDGETS GTK3
ZLIB

Important settings:
  value of $EMACSLOADPATH: /home/akib/.guix-profile/share/emacs/site-lisp:/gnu/store/kbim2zycpr57xyj9dbh8r013srkaaif3-emacs-edge-29.0.50-1.686296b/share/emacs/29.0.50/lisp
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: @im=exwm-xim
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  shell-dirtrack-mode: t
  diff-hl-margin-mode: t
  diff-hl-flydiff-mode: t
  gcmh-mode: t
  server-mode: t
  gtags-mode: t
  corfu-doc-mode: t
  corfu-history-mode: t
  global-corfu-mode: t
  isearch-mb-mode: t
  global-auto-revert-mode: t
  save-place-mode: t
  electric-pair-mode: t
  gc-buffers-mode: t
  which-key-mode: t
  marginalia-mode: t
  vertico-mode: t
  minibar-mode: t
  workroom-mode: t
  savehist-mode: t
  recentf-mode: t
  shackle-mode: t
  blow-mode: t
  leaf-key-override-global-mode: t
  el-patch-use-package-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-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

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Features:
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Memory information:
((conses 16 1473349 1276686)
 (symbols 48 75485 264)
 (strings 32 385189 389346)
 (string-bytes 1 17340803)
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 (buffers 992 55))

-- 
Akib Azmain Turja

Find me on Mastodon at @akib <at> hostux.social.

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Message #8 received at 57199 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Akib Azmain Turja <akib <at> disroot.org>
Cc: 57199 <at> debbugs.gnu.org
Subject: Re: bug#57199: 29.0.50;
 Processes spawned by Emacs become zombie after restarting
Date: Sun, 14 Aug 2022 10:52:49 +0300

> Date: Sun, 14 Aug 2022 13:30:26 +0600
> From:  Akib Azmain Turja via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> Some child processes don't terminate when Emacs kills them (e.g. Tor).

What is special in those processes?  How do they avoid being killed by
Emacs?

> So, trying to kill them after restarting Emacs with "restart-emacs"
> makes those processes zombie.  So I have to kill Emacs to remove those
> zombies.

If a process actively resists being killed, then what you see is the
expected behavior, determined by the underlying OS.

Message #11 received at 57199 <at> debbugs.gnu.org (full text, mbox):

From: Akib Azmain Turja <akib <at> disroot.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 57199 <at> debbugs.gnu.org
Subject: Re: bug#57199: 29.0.50; Processes spawned by Emacs become zombie
 after restarting
Date: Sun, 14 Aug 2022 18:05:00 +0600

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

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Date: Sun, 14 Aug 2022 13:30:26 +0600
>> From:  Akib Azmain Turja via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>> 
>> Some child processes don't terminate when Emacs kills them (e.g. Tor).
>
> What is special in those processes?  How do they avoid being killed by
> Emacs?

IIUC, Emacs sends SIGHUP (from kill_buffer_processes in process.c) to
all child processes to kill them just before exiting (or restarting),
and Tor uses that signal as the reload signal.

>
>> So, trying to kill them after restarting Emacs with "restart-emacs"
>> makes those processes zombie.  So I have to kill Emacs to remove those
>> zombies.
>
> If a process actively resists being killed, then what you see is the
> expected behavior, determined by the underlying OS.

How can a process resist being killed?  SIGKILL is lethal, always.  Why
kill-emacs sends SIGHUP while kill-process and delete-process sends
SIGKILL?

-- 
Akib Azmain Turja

Find me on Mastodon at @akib <at> hostux.social.

This message is signed by me with my GnuPG key.  Its fingerprint is:

    7001 8CE5 819F 17A3 BBA6  66AF E74F 0EFA 922A E7F5

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Message #14 received at 57199 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Akib Azmain Turja <akib <at> disroot.org>
Cc: 57199 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#57199: 29.0.50; Processes spawned by Emacs become zombie
 after restarting
Date: Mon, 15 Aug 2022 09:11:44 +0200

Akib Azmain Turja <akib <at> disroot.org> writes:

> IIUC, Emacs sends SIGHUP (from kill_buffer_processes in process.c) to
> all child processes to kill them just before exiting (or restarting),
> and Tor uses that signal as the reload signal.

[...]

> How can a process resist being killed?  SIGKILL is lethal, always.  Why
> kill-emacs sends SIGHUP while kill-process and delete-process sends
> SIGKILL?

Because we want processes started by Emacs to be allowed to shut down
gracefully upon Emacs exit, but with explicit `kill-process', we don't
care about that as much.

So the problem here is that you're starting a process that responds to
SIGHUP by not shutting down, and I don't think there's anything we can
do on the Emacs side to help with that.  Perhaps you can write a wrapper
script that does the right thing on HUP.

But I don't think there's anything to be done on the Emacs side here, so
I'm closing this bug report.

Message #19 received at 57199 <at> debbugs.gnu.org (full text, mbox):

From: Akib Azmain Turja <akib <at> disroot.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 57199 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#57199: 29.0.50; Processes spawned by Emacs become zombie
 after restarting
Date: Mon, 15 Aug 2022 15:50:34 +0600

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

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Akib Azmain Turja <akib <at> disroot.org> writes:
>
>> IIUC, Emacs sends SIGHUP (from kill_buffer_processes in process.c) to
>> all child processes to kill them just before exiting (or restarting),
>> and Tor uses that signal as the reload signal.
>
> [...]
>
>> How can a process resist being killed?  SIGKILL is lethal, always.  Why
>> kill-emacs sends SIGHUP while kill-process and delete-process sends
>> SIGKILL?
>
> Because we want processes started by Emacs to be allowed to shut down
> gracefully upon Emacs exit, but with explicit `kill-process', we don't
> care about that as much.
>
> So the problem here is that you're starting a process that responds to
> SIGHUP by not shutting down, and I don't think there's anything we can
> do on the Emacs side to help with that.  Perhaps you can write a wrapper
> script that does the right thing on HUP.
>
> But I don't think there's anything to be done on the Emacs side here, so
> I'm closing this bug report.
>
>
>

Why there is nothing to do?  Emacs can "wait" on the child when it
exits, or it might disown it.

-- 
Akib Azmain Turja

Find me on Mastodon at @akib <at> hostux.social.

This message is signed by me with my GnuPG key.  Its fingerprint is:

    7001 8CE5 819F 17A3 BBA6  66AF E74F 0EFA 922A E7F5

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