CREATE TABLE a ( id int );
begin;
--echo # Connection con1
connect (con1, localhost, root);
connection con1;
begin;
--echo # Connection default
connection default;
show fields from a;
--echo # Connection con1

connection con1;
--send alter table a add a int

--echo # Connection default

connection default;
LET $wait_condition=
  SELECT COUNT(*) = 1 FROM information_schema.processlist
    WHERE state LIKE 'Waiting for table metadata lock';
--source include/wait_condition.inc
select * from a;
--echo # Connection default
connection default;
--error ER_LOCK_DEADLOCK