Ok, here is some more info:

# ls -l /lib/dbus-1.0/dbus-daemon-launch-helper
-rwsr-xr-- 1 root avahi 47520 2010-03-30 18:43 
/lib/dbus-1.0/dbus-daemon-launch-helper

# cat /etc/group | grep -e 108 -e avahi
messagebus:x:108:
avahi-autoipd:x:111:
avahi:x:112:

# cat /etc/passwd | grep -e messagebus -e 108 -e avahi
messagebus:x:102:108::/var/run/dbus:/bin/false
avahi-autoipd:x:103:111:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false
avahi:x:104:112:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false
haldaemon:x:108:115:Hardware abstraction layer,,,:/var/run/hald:/bin/false

# sudo strace -s 4096 -f -o /tmp/trace -p `ps h -o %p -U messagebus`
Process 409 attached - interrupt to quit
Process 21785 attached
Process 21786 attached
Process 21786 detached
Process 21785 detached
Process 21851 attached
Process 21852 attached
Process 21852 detached
Process 21851 detached

# ck-list-sessions

** (ck-list-sessions:21850): WARNING **: Failed to get list of seats:
Failed to execute program /lib/dbus-1.0/dbus-daemon-launch-helper:
Success


** Attachment added: "strace"
   http://launchpadlibrarian.net/50996955/trace

-- 
Failed to execute program /lib/dbus-1.0/dbus-daemon-launch-helper: Success
https://bugs.launchpad.net/bugs/598909
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