mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> use test;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
...
...

mysql> select version();
+--------------+
| version() |
+--------------+
| 5.7.10-3-log |
+--------------+
1 row in set (0.01 sec)
 
mysql> show variables like 'default_password_lifetime';
+---------------------------+-------+
| Variable_name    | Value |
+---------------------------+-------+
| default_password_lifetime | 360  |
+---------------------------+-------+
1 row in set (0.00 sec)

alter user user() identified by "123456";