service mysql stop does not work on Ubuntu 14.04

[shinguz]

When we install mysql-server-wsrep-5.6.16-25.5-amd64.deb on Ubuntu 14.04 start works but not shutdown.
We found that package is not prepared for upstart yet.
File /etc/init/mysql.conf is missing (see mysql-server-5.6 package)
so it falls back to /etc/init.d/mysql which does not work correctly:

root@ubuntu1404tpl:~# /etc/init.d/mysql stop
 * Stopping MySQL database server mysqld [ OK ]
--> This is wrong!!!

See trace and ps later:

root@ubuntu1404tpl:~# bash -x /etc/init.d/mysql stop
+ set -e
+ set -u
+ test -x /usr/sbin/mysqld
+ . /lib/lsb/init-functions
+++ run-parts --lsbsysinit --list /lib/lsb/init-functions.d
++ for hook in '$(run-parts --lsbsysinit --list /lib/lsb/init-functions.d 2>/dev/null)'
++ '[' -r /lib/lsb/init-functions.d/20-left-info-blocks ']'
++ . /lib/lsb/init-functions.d/20-left-info-blocks
++ for hook in '$(run-parts --lsbsysinit --list /lib/lsb/init-functions.d 2>/dev/null)'
++ '[' -r /lib/lsb/init-functions.d/50-ubuntu-logging ']'
++ . /lib/lsb/init-functions.d/50-ubuntu-logging
+++ LOG_DAEMON_MSG=
++ FANCYTTY=
++ '[' -e /etc/lsb-base-logging.sh ']'
++ true
+++ dirname /etc/init.d/mysql
++ cd /etc/init.d
++ pwd -P
++ basename /etc/init.d/mysql
+ SELF=/etc/init.d/mysql
+ CONF=/etc/mysql/my.cnf
+ ERR_LOGGER='logger -p daemon.err -t /etc/init.d/mysql -i'
+ cd /
+ umask 077
+ export HOME=/etc/mysql/
+ HOME=/etc/mysql/
++ mysqld_get_param datadir
++ cut -d= -f2
++ tail -n 1
++ grep -- --datadir
++ tr ' ' '\n'
++ /usr/sbin/mysqld --print-defaults
+ datadir=/var/lib/mysql
+ '[' -z /var/lib/mysql ']'
++ mysqld_get_param pid-file
++ cut -d= -f2
++ tail -n 1
++ grep -- --pid-file
++ tr ' ' '\n'
++ /usr/sbin/mysqld --print-defaults
+ pidfile=
+ '[' -z '' ']'
++ hostname
+ pidfile=/var/lib/mysql/ubuntu1404tpl.pid
+ cmd=stop
+ '[' 1 -ge 1 ']'
+ shift
+ other_args=
+ case "$cmd" in
+ log_daemon_msg 'Stopping MySQL database server' mysqld
+ '[' -z 'Stopping MySQL database server' ']'
+ log_use_fancy_output
+ TPUT=/usr/bin/tput
+ EXPR=/usr/bin/expr
+ '[' -t 1 ']'
+ '[' xxterm '!=' x ']'
+ '[' xxterm '!=' xdumb ']'
+ '[' -x /usr/bin/tput ']'
+ '[' -x /usr/bin/expr ']'
+ /usr/bin/tput hpa 60
+ /usr/bin/tput setaf 1
+ '[' -z ']'
+ FANCYTTY=1
+ case "$FANCYTTY" in
+ true
+ /usr/bin/tput xenl
++ /usr/bin/tput cols
+ COLS=266
+ '[' 266 ']'
+ '[' 266 -gt 6 ']'
++ /usr/bin/expr 266 - 7
+ COL=259
+ log_use_plymouth
+ '[' n = y ']'
+ plymouth --ping
+ printf ' * Stopping MySQL database server mysqld '
 * Stopping MySQL database server mysqld ++ /usr/bin/expr 266 - 1
+ /usr/bin/tput hpa 265
                                                                                                                                                                                                                                                                         + printf ' '
 + mysqld_status check_dead nowarn
+ ps_alive=0
+ '[' -f /var/lib/mysql/ubuntu1404tpl.pid ']'
+ '[' check_dead = check_alive -a 0 = 1 ']'
+ '[' check_dead = check_dead -a 0 = 0 ']'
+ return 0
+ mysqld_status check_dead warn
+ ps_alive=0
+ '[' -f /var/lib/mysql/ubuntu1404tpl.pid ']'
+ '[' check_dead = check_alive -a 0 = 1 ']'
+ '[' check_dead = check_dead -a 0 = 0 ']'
+ return 0
+ log_end_msg 0
+ '[' -z 0 ']'
+ '[' 259 ']'
+ '[' -x /usr/bin/tput ']'
+ log_use_plymouth
+ '[' n = y ']'
+ plymouth --ping
+ printf '\r'
+ /usr/bin/tput hpa 259
                                                                                                                                                                                                                                                                   + '[' 0 -eq 0 ']'
+ echo '[ OK ]'
[ OK ]
+ return 0

root@ubuntu1404tpl:~# ps -ef | grep mysql
root 6461 1 0 09:58 pts/0 00:00:00 /bin/sh /usr/bin/mysqld_safe
mysql 6847 6461 0 09:58 pts/0 00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/lib/mysql/ubuntu1404tpl.err --open-files-limit=65535 --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306 --wsrep_start_position=00000000-0000-0000-0000-000000000000:-1
root 7558 1216 0 10:05 pts/0 00:00:00 grep --color=auto mysql