CREATE TABLE t1(a INT);
SELECT GET_LOCK("l1", 0);
GET_LOCK("l1", 0)
1
connect con1,localhost,root,,;
LOCK TABLES t1 WRITE;
connection default;
set debug_sync='mdl_acquire_lock_wait SIGNAL ftwrl';
FLUSH TABLES WITH READ LOCK;
connection con1;
set debug_sync='now WAIT_FOR ftwrl';
SELECT GET_LOCK("l1", 1000);
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
disconnect con1;
connection default;
SELECT RELEASE_LOCK("l1");
RELEASE_LOCK("l1")
1
UNLOCK TABLES;
DROP TABLE t1;
set debug_sync='reset';