mysql_install_db error processing ignore_db_dirs

[root@mariadb tmp]# /usr/bin/mysql_install_db --basedir=/usr --defaults-extra-file=/etc/my.cnf --datadir=/var/lib/mysql --user=mysql

Installing MariaDB/MySQL system tables in '/var/lib/mysql' ...

2016-04-22  6:00:33 140718721837088 [Note] /usr/sbin/mysqld (mysqld 10.1.13-MariaDB) starting as process 30747 ...

2016-04-22  6:00:33 140718721837088 [ERROR] An error occurred while storing ignore_db_dirs to a hash.

2016-04-22  6:00:33 140718721837088 [ERROR] Aborting

# my.cnf

#

# This group is read both both by the client and the server

# use it for options that affect everything

#

[client-server]

[mysqld]

ignore-db-dirs = lost+found

#

# include all files from the config directory

#

!includedir /etc/my.cnf.d