td-agent failed when stop

gistfile1.sh

$ cat /etc/debian_version 
6.0.6
$ sudo bash -c "echo 'deb http://packages.treasure-data.com/debian/ lucid contrib' > /etc/apt/sources.list.d/treasure-data.com.list"
$ sudo apt-get update
$ sudo apt-get install td-agent
$ dpkg -l | grep td-agent
ii  td-agent                            1.1.10.3-1                   A data collector agent for Treasure Data

# do_stop内のstart-stop-daemonの--quietオプションを無効に
$ diff -u td-agent.init /etc/init.d/td-agent 
--- td-agent.init	2012-10-17 10:31:21.000000000 +0900
+++ /etc/init.d/td-agent	2012-11-20 23:10:23.000000000 +0900
@@ -98,7 +98,8 @@
 	#   1 if daemon was already stopped
 	#   2 if daemon could not be stopped
 	#   other if a failure occurred
-	start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
+	#start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
+	start-stop-daemon --stop --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
 	RETVAL="$?"
 	[ "$RETVAL" = 2 ] && return 2
 	# Wait for children to finish too if this is a daemon that forks
@@ -107,7 +108,8 @@
 	# that waits for the process to drop all resources that could be
 	# needed by services started subsequently.  A last resort is to
 	# sleep for some time.
-	start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
+	#start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
+	start-stop-daemon --stop --oknodo --retry=0/30/KILL/5 --exec $DAEMON
 	[ "$?" = 2 ] && return 2
 	# Many daemons don't delete their pidfiles when they exit.
 	rm -f $PIDFILE

$ ps aux | grep td-agent | grep -v grep
td-agent  1689  0.0  3.5  96276 13448 ?        Sl   07:26   0:00 /usr/lib/fluent/ruby/bin/ruby /usr/sbin/td-agent --daemon /var/run/td-agent/td-agent.pid --log /var/log/td-agent/td-agent.log
td-agent  1692 38.0  5.2 108672 20004 ?        Sl   07:26   0:00 /usr/lib/fluent/ruby/bin/ruby /usr/sbin/td-agent --daemon /var/run/td-agent/td-agent.pid --log /var/log/td-agent/td-agent.log
$ cat /var/run/td-agent/td-agent.pid
1689

$ sudo /etc/init.d/td-agent stop
Stopping td-agent: td-agentNo td-agent found running; none killed.
Program /usr/lib/fluent/ruby/bin/ruby, 1 process(es), refused to die.
 failed!

$ ps aux | grep td-agent | grep -v grep
td-agent  1719  0.8  5.2 108672 20076 ?        Sl   07:27   0:00 /usr/lib/fluent/ruby/bin/ruby /usr/sbin/td-agent --daemon /var/run/td-agent/td-agent.pid --log /var/log/td-agent/td-agent.log
$ cat /var/run/td-agent/td-agent.pid
1689

$ sudo /etc/init.d/td-agent stop
Stopping td-agent: td-agentNo td-agent found running; none killed.
.

$ ps aux | grep td-agent | grep -v grep
(nothing)