1create table t1 (a int, b int); 2create table t2 (c int, d int); 3insert t1 values (1,2),(3,4); 4insert t2 values (5,6),(7,8); 5create table t0 (x int); 6insert t0 values (11), (22); 7create trigger tr1 before update on t1 for each row insert t0 values (new.b); 8set debug_sync='open_tables_after_open_and_process_table SIGNAL ready WAIT_FOR cont'; 9update t1 join t2 on (a=c+4) set b=d; 10connect con1, localhost, root; 11set debug_sync='now WAIT_FOR ready'; 12set debug_sync='mdl_acquire_lock_wait SIGNAL cont'; 13lock table t1 write, t0 write; 14disconnect con1; 15connection default; 16drop table t1, t2, t0; 17set debug_sync='reset'; 18