MySQL Error: Error (HY000): Lost connection to MySQL server during query

First, paste the experiment version:

Os:centos 6.5

Mysql:

Mysql> select version ();
+------------+
| Version () |
+------------+
| 5.6.22 |
+------------+
1 row in Set (0.00 sec)

The thing is this: Originally to build a virtual machine on a WordPress to do experiments, just created the database, in the right to take place when the error occurred in the plan:

mysql> Grant all on wordpress.* To[email protected] identified by "wp123456";

ERROR2013 (HY000): Lost connection to MySQL server during query

Check the error log as follows: TAIL-FN 30/var/log/mysqld.log

2016-11-15 12:56:22112085 [ERROR] Missing system table Mysql.proxies_priv; Runmysql_upgrade to create it

2016-11-15 12:56:22112085 [ERROR] Native table ' Performance_schema '. ' Cond_instances ' has the wrongstructure

2016-11-15 12:56:22112085 [ERROR] Native table ' Performance_schema '. ' Events_waits_current ' has thewrong structure

2016-11-15 12:56:22112085 [ERROR] Native table ' Performance_schema '. ' Events_waits_history ' has thewrong structure

2016-11-15 12:56:22112085 [ERROR] Native table ' Performance_schema '. ' Events_waits_history_long ' has the wrong structure

Reading the wrong log has been prompted Wrongstructure (structural error), usually structural errors are caused by upgrading the MySQL version, although I did not upgrade, However, before installing MySQL5.6.22, the installation of the 5.1 version, may be due to the removal of the dirty (but before the right to do not have this problem, doubt?? ), see the online n many methods, but for my problem is not a cold ah! Suddenly on the internet to see an example of the upgrade script repair, I think I do not also apply (because I have previously installed the old version), so I tried it is ok Ah! See success that moment, sweep forehead haze O (∩_∩) o~

Execute the Upgrade script command:

/usr/local/mysql/bin/mysql_upgrade-u root-p

Enter the password after the return, again empowered to succeed, wow ka ka ....

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mysql> Grant all on wordpress.* to [e- Mail protected] identified by "wp123456";
Query OK, 0 rows Affected (0.00 sec)

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MySQL Error: Error (HY000): Lost connection to MySQL server during query