首先贴上实验用各版本：
OS：CentOS 6.5
MySQL：
mysql> select version ();
+------------+
| version () |
+------------+
| 5.6.22 |
+------------+
1 row in set (0.00 sec)
事情是这样的：本来是要在虚机上搭建一个wordpress做实验，刚创建完数据库，就在赋权额时候发生不在计划的错误：
mysql>grant all on wordpress.* to wordpress@localhost identified by "wp123456";
ERROR 2013 (HY000): Lost connection to MySQL server during query
查看报错日志如下：tail -fn 30 /var/log/mysqld.log
2017-10-25 12:56:22 112085 [ERROR] Missing system table mysql.proxies_priv; please run mysql_upgrade to create it
2017-10-25 12:56:22 112085 [ERROR] Native table 'performance_schema'.'cond_instances' has the wrong structure
2017-10-25 12:56:22 112085 [ERROR] Native table 'performance_schema'.'
最后
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