MASTER_POS_WAIT(log_name,log_pos,timeout,"connection_name") hangs, does not respect the timeout

--source include/master-slave.inc

--enable_connect_log

--connection slave

--echo # Normal anonymous connection -- works (expected -1)

select master_pos_wait('master-bin.000001',1000000,1);

--source include/stop_slave.inc

reset slave all;

eval change master 'my_slave' to master_port=$MASTER_MYPORT, master_host='127.0.0.1', master_user='root';

set default_master_connection = 'my_slave';

--source include/start_slave.inc

--echo # Call without connection name -- works (expected -1)

select master_pos_wait('master-bin.000001',1000000,1);

set default_master_connection = '';

--echo # Call for non-existing anonymous connection -- works (expected NULL)

select master_pos_wait('master-bin.000001',1000000,1);

--echo # Call with a valid connection name -- hangs

select master_pos_wait('master-bin.000001',1000000,1,"my_slave");