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[debbugs-tracker] bug#35506: closed (27.0.50; Emacs hangs while interrup

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#35506: closed (27.0.50; Emacs hangs while interrupting tramp processes)
Date: Wed, 15 May 2019 14:34:02 +0000

Your message dated Wed, 15 May 2019 16:32:59 +0200
with message-id <address@hidden>
and subject line Re: bug#35506: 27.0.50; Emacs hangs while interrupting tramp 
has caused the debbugs.gnu.org bug report #35506,
regarding 27.0.50; Emacs hangs while interrupting tramp processes
to be marked as done.

(If you believe you have received this mail in error, please contact

35506: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=35506
GNU Bug Tracking System
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--- Begin Message --- Subject: 27.0.50; Emacs hangs while interrupting tramp processes Date: Tue, 30 Apr 2019 13:06:39 -0400
There are two issues I ran into recently while trying to interrupt a
remote process spawned by tramp.  The process in question is terraform
which ahss the following process tree:

  process1 (spawned by tramp)
  ⌞ process2 (child process)
    ⌞ process3 (multiple sub processes)
    ⌞ process4

process1 does not handle signals which causes the interrupts to be
ignored.  Moreover because of the following line in
`tramp-interrupt-process', Emacs ends up busy waiting until the process

  (with-timeout (1 (ignore))
    (while (tramp-accept-process-output proc))
    ;; Report success.

It looks like the first issue can be solved by killing the entire
process group, but I am not sure how safe it is to always do that.  I
will attach a patch that I use locally which seem harmless so far.

The second issue can be solved by not waiting for the process to exit.
This seems to be in line with the contract of `interrupt-process'.  I
will attach a patch to remove the wait.

Note, the following commit is not on master.  This is a local commit
with a bunch of changes that I'm trying to get pushed to master.

In GNU Emacs 27.0.50 (build 22, x86_64-pc-linux-gnu, GTK+ Version 3.24.8)
 of 2019-04-29 built on amun
Repository revision: cf2d0e2e58a683756878c9c7e4dd2066efe6e807
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Arch Linux

Recent messages:
Mark saved where search started
[a-z..]:Set [SPC]:clear
Quit [2 times]
Winner undo (1 / 199)
[mu4e] Switched context to personal
(New file)
Mark set
Starting new Ispell process /usr/bin/ispell with default dictionary...
Invalid face attribute :inherit mu4e-header-key-face [17 times]
Message modified; kill anyway? (y or n) y

Configured using:
 'configure --prefix=/home/jvshahid/bin/emacs-27

Configured features:

Important settings:
  value of $LC_COLLATE: en_US.UTF-8
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: mu4e-headers

Minor modes in effect:
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Load-path shadows:
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Memory information:
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--- End Message ---
--- Begin Message --- Subject: Re: bug#35506: 27.0.50; Emacs hangs while interrupting tramp processes Date: Wed, 15 May 2019 16:32:59 +0200 User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)
John Shahid <address@hidden> writes:

Hi John,

>>> I just tried that patch and it fixed the issue.  The 1 second timeout
>>> isn't noticeable at all.  I'm happy to create a patch and attach it to
>>> the bug report.
>> Could it be that we're waiting on each other? Do you plan to contribute
>> a patch, or shall I do?
> Indeed.  I went ahead and created the patch.

Thanks. I've pushed it to master, closing the bug.

Best regards, Michael.

--- End Message ---

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