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

Previous Next

Full log

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

[signature.asc (application/pgp-signature, inline)]

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.