Galera test case MDEV-16509 unstable

galera.MDEV-16509 'innodb' w11 [ fail ] timeout after 900 seconds
14:58:32 Test ended at 2023-12-14 13:58:32
14:58:32
14:58:32 Test case timeout after 900 seconds
14:58:32
14:58:32 == /var/lib/jenkins/workspace/mariadb-10.5-mtr/mysql-test/var/11/log/MDEV-16509.log ==
14:58:32 SET DEBUG_SYNC = "now WAIT_FOR bcol_reached_1";
14:58:32 wsrep_last_seen_gtid_match
14:58:32 1
14:58:32 connection node_1a;
14:58:32 SET DEBUG_SYNC = "wsrep_before_commit_order_leave SIGNAL bcol_reached_2 WAIT_FOR bcol_continue_2";
14:58:32 SET DEBUG_SYNC = "wsrep_after_commit_order_leave SIGNAL acol_reached_2 WAIT_FOR acol_continue_2";
14:58:32 SET DEBUG_SYNC = "after_group_after_commit SIGNAL agac_reached_2 WAIT_FOR agac_continue_2";
14:58:32 INSERT INTO t1 VALUES (3);;
14:58:32 connection ctrl;
14:58:32 SET DEBUG_SYNC = "now SIGNAL bcol_continue_1";
14:58:32 SET DEBUG_SYNC = "now WAIT_FOR acol_reached_1";
14:58:32 Warnings:
14:58:32 Warning 1639 debug sync point wait timed out
14:58:32 SET DEBUG_SYNC = "now WAIT_FOR bcol_reached_2";
14:58:32 Warnings:
14:58:32 Warning 1639 debug sync point wait timed out
14:58:32 wsrep_last_seen_gtid_match
14:58:32 0
14:58:32 SET DEBUG_SYNC = "now SIGNAL bcol_continue_2";
14:58:32 SET DEBUG_SYNC = "now WAIT_FOR acol_reached_2";
{noformat]