Comment 8 for bug 1368552

As mentioned elsewhere, please use CLI

mysql> \s
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/sda/Percona-Server-5.6.21-rel69.0-681.Linux.x86_64-debug/bin/mysql Ver 14.14 Distrib 5.6.21-69.0, for Linux (x86_64) using EditLine wrapper

Connection id: 1
Current database: test
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.6.21-69.0-debug Percona Server (GPL), Release 69.0, Revision 681, DEBUG BINARY
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: latin1
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /sda/Percona-Server-5.6.21-rel69.0-681.Linux.x86_64-debug/socket.sock
Uptime: 4 sec

Threads: 1 Questions: 5 Slow queries: 0 Opens: 67 Flush tables: 1 Open tables: 60 Queries per second avg: 1.250
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mysql> CREATE TABLE t2(s1 INT);
sched_priority_purge=0;Query OK, 0 rows affected (0.21 sec)

mysql> CREATE TABLE t1(c INT);
Query OK, 0 rows affected (0.09 sec)

mysql> flush tables t1,t2 with read lock;
Query OK, 0 rows affected (0.06 sec)

mysql> SET GLOBAL innodb_sched_priority_purge=0;
ERROR 2013 (HY000): Lost connection to MySQL server during query