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