Comment 7 for bug 232364

you can remove the ssh stuff from any test setup.

reproduced it here on my laptop MacBookPro with a Core2Duo CPU

let .xinitrc end as follows:
......................................................................
# add dbus-launch if found
dbuslaunch="`which dbus-launch 2>/dev/null`"
if [ -n "$dbuslaunch" ] && [ -x "$dbuslaunch" ]; then
    WINDOWMANAGER="$dbuslaunch --sh-syntax --exit-with-session $WINDOWMANAGER"
fi

#
exec $WINDOWMANAGER

# call failsafe
exit 0
.......................................................................

and that's enough to reproduce the hang.