samba - Jul 2014 - Samba 4.1.9 - Could not find child error

We are seeing this error in the logs every minute -

[2014/07/23 16:40:59.829260,  2, pid=13355]
../source3/smbd/server.c:437(remove_child_pid)

  Could not find child 19021 -- ignoring

I know there is an old bug/fix -
https://bugzilla.samba.org/show_bug.cgi?id=8269

smb.conf entries related to printer and printcap (disabled) -

load printers = no

printcap name = /dev/null

printcap cache time = 0

log level = 2

We want the log level to be 2. I see that the code - in Samba 4.1.9

if (child == NULL) {

                /* not all forked child processes are added to the children
list */

                DEBUG(2, ("Could not find child %d -- ignoring\n",
(int
)pid));

                return;

        }

Question - Given the log level we want, how can we prevent these errors in
the log? Did I miss disabling printer/printcap completely? How do we stop
forking these untracked processes?

Asides this - is Samba 4.1X still using source3 code base?

Any help in this is appreciated,
Regards.
Krishna Harathi