MariaDB Systemd service does not start when 'chroot' option is activated in my.cnf

# service mariadb start

$ /usr/sbin/mysqld

$ cp /etc/init.d/mysql /etc/init.d/mysql-test

$ chmod 755 /etc/init.d/mysql-test

$ systemctl daemon-reload

$ service mysql-test start

service mariadb stop

CHROOT=/srv/chroot-mariadb

mkdir -p $CHROOT/{usr/share,tmp,lib,etc,var/lib,var/run/mysqld,var/log/mysql}

cd $CHROOT

chmod 1777 tmp

grep 'mysql:' /etc/passwd > etc/passwd

mv /var/lib/mysql var/lib/

cp -a /usr/share/mysql $CHROOT/usr/share/

chown mysql:mysql $CHROOT/{tmp,var/lib/mysql,var/run/mysqld,var/log/mysql}

ln -s $CHROOT/var/lib/mysql/ /var/lib/mysql

mv /var/run/mysqld var/run

ln -s $CHROOT/var/run/mysqld/ /var/run/mysqld

librairies="$(ldd $(which mysqld)) $(find /{lib,usr/lib} -name 'libnss*')"

regex="^/(.+)/.+$"

while read adr1 arrow adr2 foo; do

	[ -z "$adr2" ] && f=$adr1 || f=$adr2

	if [[ $f =~ $regex ]]; then

		folder="${BASH_REMATCH[1]}"

		[ ! -d "$folder" ] && mkdir -p $folder

		cp $f $folder/

	fi

done < <(echo -e "$librairies")

echo -e "[client]

socket = $CHROOT/var/run/mysqld/mysqld.sock

[mysqld]

chroot = $CHROOT" >> /etc/mysql/conf.d/chroot.cnf