GNU bug report logs - #5283
23.1.90; If dbus session bus is not available, emacs is busily trying to contact it

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Message #3 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andreas Köhler <andi5.py <at> gmx.net>
To: emacs-pretest-bug <at> gnu.org
Subject: bug#5283: 23.1.90;
	If dbus session bus is not available, emacs is busily trying to
	contact it
Date: Tue, 29 Dec 2009 18:56:24 +0100

In GNU Emacs 23.1.90.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.18.3)
 of 2009-12-29 on ubuntu
configured using `configure  '--prefix=/home/andi/dev/emacs/inst''

Git: 9a339f5040b089f97a4b5c86eefa3942b2e5eda4

Initially, I observed that emacs-snapshot from ubuntu karmic in a dtach 
session as server starts using 100% of the cpu when i logged out. It 
seemed to be trying to contact the dbus session bus all the time, even 
after I logged in again.

I tried to track this down a bit further, so now the info is:

- emacs built from the git repo (9a339f5), with dbus support
- log in
- emacs -Q --daemon --eval "(require 'tramp)"
- log out

-> emacs is eating the whole cpu, but also growing with about 100 MB per 
second of resident memory. As I needed to kill it very quickly, I am not 
sure whether the dbus_bus_get calls are still the root cause of the problem.

Message #6 received at 5283 <at> debbugs.gnu.org (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Michael Albinus  <michael.albinus <at> gmx.de>
Cc: 5283 <at> debbugs.gnu.org, Andreas Köhler <andi5.py <at> gmx.net>
Subject: Re: bug#5283: 23.1.90;
	If dbus session bus is not available, emacs is busily trying to
	contact it
Date: Fri, 01 Jan 2010 16:33:28 -0500

> Initially, I observed that emacs-snapshot from ubuntu karmic in a
> dtach session as server starts using 100% of the cpu when i logged
> out. It seemed to be trying to contact the dbus session bus all the
> time, even after I logged in again.
>
> I tried to track this down a bit further, so now the info is:
>
> - emacs built from the git repo (9a339f5), with dbus support
> - log in
> - emacs -Q --daemon --eval "(require 'tramp)"
> - log out
>
> -> emacs is eating the whole cpu, but also growing with about 100 MB
> per second of resident memory. As I needed to kill it very quickly, I
> am not sure whether the dbus_bus_get calls are still the root cause of
> the problem.

Hmm, I can't seem to reproduce this.  Michael, can you?

Message #9 received at 5283 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: 5283 <at> debbugs.gnu.org, Andreas Köhler <andi5.py <at> gmx.net>
Subject: Re: bug#5283: 23.1.90; If dbus session bus is not available, emacs
	is busily trying to contact it
Date: Sat, 02 Jan 2010 09:01:42 +0100

Chong Yidong wrote:
> Hmm, I can't seem to reproduce this.  Michael, can you?
>   
I've seen the report. I'm just fighting with some local problems; when 
my laptop is back to business, I'll investigate.

Best regards, Michael.

Message #12 received at 5283 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: 5283 <at> debbugs.gnu.org, "=?UTF-8?B?QW5kcmVhcyBLw7,
	ZobGVy?=" <andi5.py <at> gmx.net>
Subject: Re: bug#5283: 23.1.90; If dbus session bus is not available, emacs
	is busily trying to contact it
Date: Sun, 03 Jan 2010 20:34:06 +0100

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

Looks like my previous mail didn't receive anybody, so I append it.

A simple scenario to force the problem (and to debug it) in a shell:

$ eval `dbus-launch`
$ emacs -Q --eval "(require 'tramp)" &
[1] 21501
$ kill -9 $DBUS_SESSION_BUS_PID

Best regards, Michael.

[Message part 2 (message/rfc822, inline)]

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: 5283 <at> debbugs.gnu.org, =?UTF-8?B?QW5kcmVhcyBLw7ZobGVy?=
 <andi5.py <at> gmx.net>
Subject: Re: bug#5283: 23.1.90; If dbus session bus is not available, emacs
 is busily trying to contact it
Date: Sat, 02 Jan 2010 09:01:42 +0100

Chong Yidong wrote:
> Hmm, I can't seem to reproduce this.  Michael, can you?
>   
I've seen the report. I'm just fighting with some local problems; when 
my laptop is back to business, I'll investigate.

Best regards, Michael.

Message #15 received at 5283 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Andreas Köhler <andi5.py <at> gmx.net>
Cc: 5283 <at> debbugs.gnu.org
Subject: Re: bug#5283: 23.1.90;
	If dbus session bus is not available, emacs is busily trying to
	contact it
Date: Sun, 03 Jan 2010 20:52:37 +0100

Andreas Köhler <andi5.py <at> gmx.net> writes:

> Initially, I observed that emacs-snapshot from ubuntu karmic in a
> dtach session as server starts using 100% of the cpu when i logged
> out. It seemed to be trying to contact the dbus session bus all the
> time, even after I logged in again.

When you log out, the D-Bus session bus is killed. Emacs' dbusbind does
not recognize that, and still tries to poll the session bus.

I've added unsetting of $DBUS_SESSION_BUS_ADDRESS in xd_remove_watch,
when the session bus is meant. This shall fix the problem (at least, it
does it for me).

Thanks for reporting, and best regards, Michael.

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