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The problem was in a test case for Bug33507:
- when the number of active connections reaches the limit,
the server accepts only root connections. That's achieved by
accepting a connection, negotiating with the client and
checking user credentials. If it is not SUPER, the connection
is dropped.
- when the server accepts connection, it increases the counter;
- when the server drops connection, it decreases the counter;
- the race was in between of decreasing the counter and accepting
new connection:
- max_user_connections = 2;
- 2 oridinary user connections accepted;
- extra user connection is establishing;
- server checked user credentials, and sent 'Too many connections'
error;
- the client receives the error and establishes extra SUPER user
connection;
- the server however didn't decrease the counter (the extra
user connection still is "alive" in the server) -- so, the new
SUPER-user connection, will be dropped, because it exceeds
(max_user_connections + 1).
The fix is to implement "safe connect", which makes several attempts
to connect and use it in the test script.
220 lines
5.7 KiB
Text
220 lines
5.7 KiB
Text
drop table if exists t1,t2;
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show tables;
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Tables_in_mysql
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columns_priv
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db
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event
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func
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general_log
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help_category
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help_keyword
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help_relation
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help_topic
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host
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ndb_binlog_index
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plugin
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proc
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procs_priv
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servers
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slow_log
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tables_priv
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time_zone
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time_zone_leap_second
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time_zone_name
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time_zone_transition
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time_zone_transition_type
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user
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show tables;
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Tables_in_test
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connect(localhost,root,z,test2,MASTER_PORT,MASTER_SOCKET);
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ERROR 28000: Access denied for user 'root'@'localhost' (using password: YES)
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connect(localhost,root,z,test,MASTER_PORT,MASTER_SOCKET);
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ERROR 28000: Access denied for user 'root'@'localhost' (using password: YES)
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grant ALL on *.* to test@localhost identified by "gambling";
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grant ALL on *.* to test@127.0.0.1 identified by "gambling";
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show tables;
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Tables_in_mysql
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columns_priv
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db
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event
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func
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general_log
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help_category
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help_keyword
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help_relation
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help_topic
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host
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ndb_binlog_index
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plugin
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proc
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procs_priv
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servers
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slow_log
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tables_priv
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time_zone
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time_zone_leap_second
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time_zone_name
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time_zone_transition
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time_zone_transition_type
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user
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show tables;
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Tables_in_test
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connect(localhost,test,,test2,MASTER_PORT,MASTER_SOCKET);
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ERROR 28000: Access denied for user 'test'@'localhost' (using password: NO)
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connect(localhost,test,,"",MASTER_PORT,MASTER_SOCKET);
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ERROR 28000: Access denied for user 'test'@'localhost' (using password: NO)
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connect(localhost,test,zorro,test2,MASTER_PORT,MASTER_SOCKET);
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ERROR 28000: Access denied for user 'test'@'localhost' (using password: YES)
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connect(localhost,test,zorro,test,MASTER_PORT,MASTER_SOCKET);
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ERROR 28000: Access denied for user 'test'@'localhost' (using password: YES)
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update mysql.user set password=old_password("gambling2") where user=_binary"test";
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flush privileges;
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set password="";
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set password='gambling3';
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ERROR HY000: Password hash should be a 41-digit hexadecimal number
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set password=old_password('gambling3');
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show tables;
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Tables_in_mysql
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columns_priv
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db
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event
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func
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general_log
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help_category
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help_keyword
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help_relation
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help_topic
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host
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ndb_binlog_index
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plugin
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proc
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procs_priv
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servers
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slow_log
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tables_priv
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time_zone
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time_zone_leap_second
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time_zone_name
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time_zone_transition
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time_zone_transition_type
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user
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show tables;
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Tables_in_test
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connect(localhost,test,,test2,MASTER_PORT,MASTER_SOCKET);
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ERROR 28000: Access denied for user 'test'@'localhost' (using password: NO)
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connect(localhost,test,,test,MASTER_PORT,MASTER_SOCKET);
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ERROR 28000: Access denied for user 'test'@'localhost' (using password: NO)
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connect(localhost,test,zorro,test2,MASTER_PORT,MASTER_SOCKET);
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ERROR 28000: Access denied for user 'test'@'localhost' (using password: YES)
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connect(localhost,test,zorro,test,MASTER_PORT,MASTER_SOCKET);
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ERROR 28000: Access denied for user 'test'@'localhost' (using password: YES)
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delete from mysql.user where user=_binary"test";
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flush privileges;
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create table t1 (id integer not null auto_increment primary key);
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create temporary table t2(id integer not null auto_increment primary key);
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set @id := 1;
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delete from t1 where id like @id;
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drop table t1;
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# ------------------------------------------------------------------
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# -- End of 4.1 tests
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# ------------------------------------------------------------------
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# -- Bug#33507: Event scheduler creates more threads than max_connections
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# -- which results in user lockout.
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GRANT USAGE ON *.* TO mysqltest_u1@localhost;
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SET GLOBAL max_connections = 3;
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SET GLOBAL event_scheduler = ON;
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# -- Waiting for Event Scheduler to start...
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# -- Disconnecting default connection...
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# -- Check that we allow exactly three user connections, no matter how
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# -- many threads are running.
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# -- Connecting (1)...
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# -- Establishing connection 'con_1' (user: mysqltest_u1)...
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# -- Connection 'con_1' has been established.
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# -- Connecting (2)...
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# -- Establishing connection 'con_2' (user: mysqltest_u1)...
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# -- Connection 'con_2' has been established.
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# -- Connecting (3)...
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# -- Establishing connection 'con_3' (user: mysqltest_u1)...
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# -- Connection 'con_3' has been established.
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# -- Connecting (4) [should fail]...
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# -- Establishing connection 'con_4' (user: mysqltest_u1)...
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# -- Error: can not establish connection 'con_4'.
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# -- Check that we allow one extra SUPER-user connection.
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# -- Connecting super (1)...
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# -- Establishing connection 'con_super_1' (user: root)...
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# -- Connection 'con_super_1' has been established.
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# -- Connecting super (2) [should fail]...
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# -- Establishing connection 'con_super_2' (user: root)...
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# -- Error: can not establish connection 'con_super_2'.
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# -- Ensure that we have Event Scheduler thread, 3 ordinary user
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# -- connections and one extra super-user connection.
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SELECT user FROM information_schema.processlist ORDER BY id;
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user
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event_scheduler
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mysqltest_u1
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mysqltest_u1
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mysqltest_u1
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root
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# -- Resetting variables...
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SET GLOBAL max_connections = 151;
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# -- Stopping Event Scheduler...
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SET GLOBAL event_scheduler = OFF;
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# -- Waiting for Event Scheduler to stop...
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# -- That's it. Closing connections...
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# -- Restoring default connection...
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# -- Waiting for connections to close...
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DROP USER mysqltest_u1@localhost;
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# -- End of Bug#33507.
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# -- Bug#35074: max_used_connections is not correct.
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FLUSH STATUS;
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SHOW STATUS LIKE 'max_used_connections';
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Variable_name Value
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Max_used_connections 1
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# -- Starting Event Scheduler...
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SET GLOBAL event_scheduler = ON;
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# -- Waiting for Event Scheduler to start...
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# -- Opening a new connection to check max_used_connections...
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# -- Check that max_used_connections hasn't changed.
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SHOW STATUS LIKE 'max_used_connections';
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Variable_name Value
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Max_used_connections 2
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# -- Closing new connection...
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# -- Stopping Event Scheduler...
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SET GLOBAL event_scheduler = OFF;
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# -- Waiting for Event Scheduler to stop...
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# -- End of Bug#35074.
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# ------------------------------------------------------------------
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# -- End of 5.1 tests
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# ------------------------------------------------------------------
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