DBUS racing condition on pluma and other application

[PerfMonk]

just typing in a shell (logged with my current user) : pluma file&

generate this warning:

trebe03@m193543:~/bin$ pluma youtube-dl.py &
[1] 19036
trebe03@m193543:~/bin$
** (pluma:19036): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-UF9kBx3qDw: Connexion refusée

[1]+ Fini pluma youtube-dl.py
trebe03@m193543:~/bin$

and this bug was generated by typing :

trebe03@m193543:~$ ubuntu-bug dbus

** (apport-gtk:20256): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-UF9kBx3qDw: Connexion refusée

(process:20711): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
trebe03@m193543:~$

It doesn't disturb much the OS but is annoying the user. ;=)

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: dbus 1.8.12-1ubuntu5
ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
Uname: Linux 4.1.0-3-generic x86_64
ApportVersion: 2.18-0ubuntu5
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Aug 4 14:54:03 2015
InstallationDate: Installed on 2015-07-22 (12 days ago)
InstallationMedia: Ubuntu-MATE 15.10 "Wily Werewolf" - Alpha amd64 (20150721)
SourcePackage: dbus
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

[Expired for dbus (Ubuntu) because there has been no activity for 60 days.]