[Samba] CTDB 50.samba: ERROR: smb.conf cache create failed

[steve]

Ubuntu 14.04, ctdb 2.5.1 from the ubuntu package. samba 4.1.11 with
cluster support from source.

Error upon startup only. Restarting ctdb on that node clears the error.
The other node with the same config is OK. Any ideas?
Cheers,
Steve

smb.conf
[global]
workgroup = ALTEA
realm = ALTEA.SITE
security = ADS
kerberos method = secrets and keytab
netbios name = SMBCLUSTER
disable netbios = Yes
clustering = Yes
ctdbd socket = /var/lib/run/ctdb/ctdbd.socket
pid director = /var/run/samba
[users]
path = /cluster/users
read only = No
[profiles]
path = /cluster/profiles
read only = No
[shared]
path = /cluster/shared
force create mode = 0770
read only = No

50.samba
#!/bin/sh
# ctdb event script for Samba

[ -n "$CTDB_BASE" ] || \
    export CTDB_BASE=$(cd -P $(dirname "$0") ; dirname "$PWD")

. $CTDB_BASE/functions

detect_init_style

case $CTDB_INIT_STYLE in
	suse)
		CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-smb}
		CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-nmb}
		;;
	debian)
		CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-samba}
		CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-""}
		;;
	*)
		# Use redhat style as default:
		
		CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-smb}
		CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-""}
		;;
esac

service_name="samba"

loadconfig

ctdb_setup_service_state_dir

service_start ()
{
    # make sure samba is not already started
    service "$CTDB_SERVICE_SMB" stop > /dev/null 2>&1
    if [ -n "$CTDB_SERVICE_NMB" ] ; then
	service "$CTDB_SERVICE_NMB" stop > /dev/null 2>&1
    fi
    killall -0 -q smbd && {
	sleep 1
	# make absolutely sure samba is dead
	killall -q -9 smbd
    }
    killall -0 -q nmbd && {
	sleep 1
	# make absolutely sure samba is dead
	killall -q -9 nmbd
    }

    # start Samba service. Start it reniced, as under very heavy load
    # the number of smbd processes will mean that it leaves few cycles
    # for anything else
    net serverid wipe

    if [ -n "$CTDB_SERVICE_NMB" ] ; then
	nice_service "$CTDB_SERVICE_NMB" start || die "Failed to start nmbd"
    fi

    service "$CTDB_SERVICE_SMB" start || die "Failed to start samba"
}

service_stop ()
{
    service "$CTDB_SERVICE_SMB" stop
    if [ -n "$CTDB_SERVICE_NMB" ] ; then
	service "$CTDB_SERVICE_NMB" stop
    fi
}

######################################################################
# Show the testparm output using a cached smb.conf to avoid delays due
# to registry access.

smbconf_cache="$service_state_dir/smb.conf.cache"

testparm_foreground_update ()
{
    _timeout="$1"

    if ! _out=$(timeout $_timeout testparm -v -s 2>/dev/null) ; then
	if [ -f "$smbconf_cache" ] ; then
	    echo "WARNING: smb.conf cache update failed - using old cache file"
	    return 1
	else
	    die "ERROR: smb.conf cache create failed"
	fi
    fi

    _tmpfile="${smbconf_cache}.$$"
    # Patterns to exclude...
    pat='^[[:space:]]+(registry[[:space:]]+shares|include|copy|
winbind[[:space:]]+separator)[[:space:]]+='    
    echo "$_out" | grep -Ev "$pat" >"$_tmpfile"
    mv "$_tmpfile" "$smbconf_cache" # atomic

    return 0
}

testparm_background_update ()
{
    _timeout="$1"

    testparm_foreground_update $_timeout >/dev/null 2>&1 </dev/null &
}

testparm_cat ()
{
    testparm -s "$smbconf_cache" "$@" 2>/dev/null
}

list_samba_shares ()
{
    testparm_cat |
    sed -n -e 's@^[[:space:]]*path[[:space:]]*=[[:space:]]@@p' |
    sed -e 's/"//g'
}

list_samba_ports ()
{
    testparm_cat --parameter-name="smb ports" |
    sed -e 's@,@ @g'
}

###########################

ctdb_start_stop_service

is_ctdb_managed_service || exit 0

###########################

case "$1" in
     startup)
	ctdb_service_start
	;;

     shutdown)
	ctdb_service_stop
	;;

     monitor)
	testparm_foreground_update 10
	ret=$?

	smb_ports="$CTDB_SAMBA_CHECK_PORTS"
	if [ -z "$smb_ports" ] ; then
	    smb_ports=$(list_samba_ports)
	    [ -n "$smb_ports" ] || die "Failed to set smb ports"
	fi
	ctdb_check_tcp_ports $smb_ports || exit $?

	if [ "$CTDB_SAMBA_SKIP_SHARE_CHECK" != "yes" ] ; then
	    list_samba_shares | ctdb_check_directories || exit $?
	fi

	if [ $ret -ne 0 ] ; then
	    testparm_background_update 10
	fi
	;;

    *)
	ctdb_standard_event_handler "$@"
	;;
esac
exit 0