MariaDB error in GuixSD

After creating /var/lib/mysql directory, running MariaDB gives this error:
$ mysqld
2017-02-14 17:41:45 3073408640 [Note] mysqld (mysqld 10.1.21-MariaDB) starting as process 19269 ...
2017-02-14 17:41:45 3073408640 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2017-02-14 17:41:45 3073408640 [Note] InnoDB: The InnoDB memory heap is disabled
2017-02-14 17:41:45 3073408640 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2017-02-14 17:41:45 3073408640 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2017-02-14 17:41:45 3073408640 [Note] InnoDB: Compressed tables use zlib 1.2.3
2017-02-14 17:41:45 3073408640 [Note] InnoDB: Using Linux native AIO
2017-02-14 17:41:45 3073408640 [Note] InnoDB: Using generic crc32 instructions
2017-02-14 17:41:45 3073408640 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2017-02-14 17:41:45 3073408640 [Note] InnoDB: Completed initialization of buffer pool
2017-02-14 17:41:45 3073408640 [Note] InnoDB: The first specified data file ./ibdata1 did not exist: a new database to be created!
2017-02-14 17:41:45 3073408640 [Note] InnoDB: Setting file ./ibdata1 size to 12 MB
2017-02-14 17:41:45 3073408640 [Note] InnoDB: Database physically writes the file full: wait...
2017-02-14 17:41:46 3073408640 [Note] InnoDB: Setting log file ./ib_logfile101 size to 48 MB
2017-02-14 17:41:48 3073408640 [Note] InnoDB: Setting log file ./ib_logfile1 size to 48 MB
2017-02-14 17:41:50 3073408640 [Note] InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile0
2017-02-14 17:41:50 3073408640 [Warning] InnoDB: New log files created, LSN=45883
2017-02-14 17:41:50 3073408640 [Note] InnoDB: Doublewrite buffer not found: creating new
2017-02-14 17:41:50 3073408640 [Note] InnoDB: Doublewrite buffer created
2017-02-14 17:41:50 3073408640 [Note] InnoDB: 128 rollback segment(s) are active.
2017-02-14 17:41:50 3073408640 [Warning] InnoDB: Creating foreign key constraint system tables.
2017-02-14 17:41:50 3073408640 [Note] InnoDB: Foreign key constraint system tables created
2017-02-14 17:41:50 3073408640 [Note] InnoDB: Creating tablespace and datafile system tables.
2017-02-14 17:41:50 3073408640 [Note] InnoDB: Tablespace and datafile system tables created.
2017-02-14 17:41:50 3073408640 [Note] InnoDB: Waiting for purge to start
2017-02-14 17:41:50 3073408640 [Note] InnoDB:  Percona XtraDB (http://www.percona.com) 5.6.34-79.1 started; log sequence number 0
2017-02-14 17:41:51 2411723584 [Note] InnoDB: Dumping buffer pool(s) not yet started
2017-02-14 17:41:51 3073408640 [Note] Plugin 'FEEDBACK' is disabled.
2017-02-14 17:41:51 3073408640 [ERROR] Could not open mysql.plugin table. Some plugins may be not loaded
2017-02-14 17:41:51 3073408640 [ERROR] Can't open and lock privilege tables: Table 'mysql.servers' doesn't exist
2017-02-14 17:41:51 3073408640 [Note] Server socket created on IP: '::'.
2017-02-14 17:41:51 3073408640 [ERROR] Can't start server : Bind on unix socket: No such file or directory
2017-02-14 17:41:51 3073408640 [ERROR] Do you already have another mysqld server running on socket: /run/mysqld/mysqld.sock ?
2017-02-14 17:41:51 3073408640 [ERROR] Aborting