Add have_debug to MDEV-20793 and add wait condition to

galera_parallel_autoinc_largetrx to stabilize it.

mysql-test/suite/galera/disabled.def

@@ -13,6 +13,7 @@
 GCF-1081 : MDEV-18283 Galera test failure on galera.GCF-1081
 MW-286 : MDEV-18464 Killing thread can cause mutex deadlock if done concurrently with Galera/replication victim kill
 MW-329 : MDEV-19962 Galera test failure on MW-329
+MW-336 : MDEV-21409: Galera test failure on MW-336
 MW-360 : needs rewrite to be MariaDB gtid compatible
 MW-388: MDEV-19803 Long semaphore wait error on galera.MW-388	
 galera_account_management : MariaDB 10.0 does not support ALTER USER
@@ -45,3 +46,4 @@ galera_wan : MDEV-17259 Test failure on galera.galera_wan
 mysql-wsrep#198 : MDEV-18935 Galera test mysql-wsrep#198 sporaric assertion transaction.cpp:362: int wsrep::transaction::before_commit(): Assertion `state() == s_executing || state() == s_committing || state() == s_must_abort || state() == s_replaying' failed.
 partition : MDEV-19958 Galera test failure on galera.partition
 query_cache: MDEV-15805 Test failure on galera.query_cache
+

mysql-test/suite/galera/t/MDEV-20793.test

@@ -11,6 +11,8 @@
 #
 
 --source include/galera_cluster.inc
+--source include/have_debug.inc
+--source include/have_debug_sync.inc
 
 CREATE TABLE t1 (f1 INT PRIMARY KEY, f2 INT);
 INSERT INTO t1 VALUES (1, 0), (5, 0);

mysql-test/suite/galera/t/galera_parallel_autoinc_largetrx.test

@@ -37,17 +37,24 @@ SET GLOBAL wsrep_slave_threads = 4;
 
 --connection node_1
 --reap
+--let $wait_condition = select count(*)=30000 from t1;
+--source include/wait_condition.inc
+
 SELECT COUNT(*) FROM t1;
 SELECT COUNT(DISTINCT f1) FROM t1;
 
 --connection node_1a
 --reap
+--let $wait_condition = select count(*)=30000 from t1;
+--source include/wait_condition.inc
 SELECT COUNT(*) FROM t1;
 SELECT COUNT(DISTINCT f1) FROM t1;
 
 --connection node_2
 --reap
 --disconnect node_1a
+--let $wait_condition = select count(*)=30000 from t1;
+--source include/wait_condition.inc
 SELECT COUNT(*) FROM t1;
 SELECT COUNT(DISTINCT f1) FROM t1;