[Pkg-xfce-devel] Bug#829557: Bug#829557: firefox: error box at start-up / D-BUS related issue

[Yves-Alexis Perez]

On Mon, 2016-07-04 at 17:48 +0100, Simon McVittie wrote:
> 
> These indicate that something in your session, whose controlling terminal
> is /dev/pts/0 (?!), used D-Bus and started a dbus-daemon as a side-effect
> ("autolaunching", pid 30347/30348); and in addition, dbus-launch was run
> during your X11 session startup (pid 9702; most likely by
> /etc/X11/Xsession.d/75dbus_dbus-launch). From the fact that pid 9702
> does not have a dbus-daemon child, I think we can infer that it has
> latched onto some other dbus-daemon - hopefully 30348 - advertised in
> a hidden X11 window by some other dbus-launch - hopefully 30347.

Besides reporting upstream, I've tried to investigate a bit here. When running the first time, I have:

corsac   27662  0.2  0.0  44372  4596 ?        Ss   15:45   0:00 /usr/bin/dbus-daemon --fork --print-pid 5 --print-address 7 --session
corsac   27661  0.0  0.0  43696   392 ?        S    15:45   0:00 /usr/bin/dbus-launch --exit-with-session --sh-syntax

and with some set -x added to the right places I get some debug from the session startup in .xsession-errors:

+ . /etc/X11/Xsession.d/75dbus_dbus-launch
+ STARTDBUS=
+ DBUSLAUNCH=/usr/bin/dbus-launch
+ has_option use-session-dbus
+ [  != # $Id: Xsession.options 189 2005-06-11 00:04:27Z branden $
#
# configuration options for /etc/X11/Xsession
# See Xsession.options(5) for an explanation of the available options.
allow-failsafe
allow-user-resources
allow-user-xsession
use-ssh-agent
use-session-dbus ]
+ return 0
+ [ -z  ]
+ [ -x /usr/bin/dbus-launch ]
+ STARTDBUS=yes
+ [ -n yes ]
+ /usr/bin/dbus-launch --exit-with-session --sh-syntax
+ eval DBUS_SESSION_BUS_ADDRESS='unix:abstract=/tmp/dbus-6vpeyeGSde,guid=fbf5751317c7c5e0a86c9466577e5ce8'; export                      DBUS_SESSION_BUS_ADDRESS; DBUS_SESSION_BUS_PID=27662; DBUS_SESSION_BUS_WINDOWID=12582913;                                               
+ DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-6vpeyeGSde,guid=fbf5751317c7c5e0a86c9466577e5ce8
+ export DBUS_SESSION_BUS_ADDRESS
+ DBUS_SESSION_BUS_PID=27662
+ DBUS_SESSION_BUS_WINDOWID=12582913

So DBUS_SESSION_BUS_PID is the pid of dbus-daemon indeed.

When running the second time, I get:

corsac   28763  0.0  0.0  43696   388 ?        S    15:52   0:00 /usr/bin/dbus- launch --exit-with-session --sh-syntax                                           

so no dbus-daemon indeed, and:

+ . /etc/X11/Xsession.d/75dbus_dbus-launch
+ STARTDBUS=
+ DBUSLAUNCH=/usr/bin/dbus-launch
+ has_option use-session-dbus
+ [  != # $Id: Xsession.options 189 2005-06-11 00:04:27Z branden $
#
# configuration options for /etc/X11/Xsession
# See Xsession.options(5) for an explanation of the available options.
allow-failsafe
allow-user-resources
allow-user-xsession
use-ssh-agent
use-session-dbus ]
+ return 0
+ [ -z  ]
+ [ -x /usr/bin/dbus-launch ]
+ STARTDBUS=yes
+ [ -n yes ]
+ /usr/bin/dbus-launch --exit-with-session --sh-syntax
+ eval DBUS_SESSION_BUS_ADDRESS='unix:abstract=/tmp/dbus-kkS99bhQSL,guid=74522c6e80d67ea8488e4b35577e5e90'; export DBUS_SESSION_BUS_ADDRESS; DBUS_SESSION_BUS_PID=28764; DBUS_SESSION_BUS_WINDOWID=4194305;
+ DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-kkS99bhQSL,guid=74522c6e80d67ea8488e4b35577e5e90
+ export DBUS_SESSION_BUS_ADDRESS
+ DBUS_SESSION_BUS_PID=28764
+ DBUS_SESSION_BUS_WINDOWID=4194305

so dbus-launch was started correctly and fork()ed dbus-daemon as 28764 but then something happened:

+ . /etc/X11/Xsession.d/90qt-a11y
+ QT_ACCESSIBILITY=1
+ QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1
+ export QT_ACCESSIBILITY QT_LINUX_ACCESSIBILITY_ALWAYS_ON
+ [ -x /usr/bin/dbus-update-activation-environment ]
+ dbus-update-activation-environment --verbose --systemd QT_ACCESSIBILITY QT_LINUX_ACCESSIBILITY_ALWAYS_ON
dbus-update-activation-environment: error: unable to connect to D-Bus: Failed to connect to socket /tmp/dbus-kkS99bhQSL: Connection refused

I'll try to investigate why dbus-daemon actually dies the second time (and why
only with lightdm 1.18.2) but any clue welcome.

Regards,
-- 

Yves-Alexis
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