Comment 2 for bug 1342574

Seeing the exact same issue here. I also note that the crash seems to be from starting smbd with the '-D' parameter by samba-ad-dc, however, it shouldn't even be trying to run this from what I can see. The system is running a fresh installation of Samba with a vanilla configuration and as such is not configured to function as a domain controller. The init.d script for samba-ad-dc contains this excerpt:

start)
                SERVER_ROLE=`samba-tool testparm --parameter-name="server role" 2>/dev/null | tail -1`
                if [ "$SERVER_ROLE" != "active directory domain controller" ]; then
                    exit 0
                fi

However, the upstart script performs no such check and simply attempts to start it unconditionally. I'm not sure if this is related to the behaviour we see here (expecting configuration parameters that aren't present?) or is a separate issue.