encryption.create_or_replace failed in buildbot with Lock wait timeout exceeded

encryption.create_or_replace 'ctr,innodb' w1 [ fail ]

        Test ended at 2020-10-26 13:26:26

CURRENT_TEST: encryption.create_or_replace

mysqltest: At line 68: query 'reap;' failed: 1205: Lock wait timeout exceeded; try restarting transaction

The result from queries just before the failure was:

SET @save_threads = @@GLOBAL.innodb_encryption_threads;

SET default_storage_engine = InnoDB;

SET GLOBAL innodb_encryption_threads = 4;

CREATE TABLE `table10_int_autoinc` (`col_int_key` int, pk int auto_increment, `col_int` int, key (`col_int_key` ),primary key (pk)) engine=innodb;

INSERT /*! IGNORE */ INTO table10_int_autoinc VALUES  (NULL, NULL, -474021888) ,  (1, NULL, NULL) ,  (1141047296, NULL, NULL) ,  (NULL, NULL, NULL) ,  (NULL, NULL, 1) ,  (NULL, NULL, 9) ,  (0, NULL, 1225785344) ,  (NULL, NULL, 1574174720) ,  (2, NULL, NULL) ,  (6, NULL, 3);

CREATE TABLE `table1_int_autoinc` (`col_int_key` int, pk int auto_increment, `col_int` int,key (`col_int_key` ), primary key (pk)) engine=innodb;

CREATE TABLE `table0_int_autoinc` (`col_int_key` int, pk int auto_increment, `col_int` int, key (`col_int_key` ),primary key (pk)) engine=innodb;

INSERT /*! IGNORE */ INTO table1_int_autoinc VALUES  (4, NULL, NULL);

INSERT IGNORE INTO `table0_int_autoinc` ( `col_int_key` ) VALUES ( 1 ), ( 3 ), ( 4 ), ( 1 );

INSERT IGNORE INTO `table1_int_autoinc` ( `col_int` ) VALUES ( 1 ), ( 0 ), ( 7 ), ( 9 );

INSERT IGNORE INTO `table10_int_autoinc` ( `col_int` ) VALUES ( 6 ), ( 2 ), ( 3 ), ( 6 );

connect  con1,localhost,root,,test;

connect  con2,localhost,root,,test;