binlog.flashback-largebinlog fails in buildbot with out of memory

binlog.flashback-largebinlog 'row'       w2 [ fail ]

        Test ended at 2019-06-14 11:54:09

CURRENT_TEST: binlog.flashback-largebinlog

mysqltest: At line 77: query 'INSERT INTO t1 VALUES (REPEAT('ManyMegaByteBlck', 67108864))' failed: 1041: Out of memory; check if mysqld or some other process uses all available memory; if not, you may have to use 'ulimit' to allow mysqld to use more memory or you can add more swap space

The result from queries just before the failure was:

< snip >

connect  default, localhost,root,,;

#

# Delete all existing binary logs.

#

RESET MASTER;

#

# Create a test table.

#

use mysqltest;

CREATE TABLE t1 (

c1 LONGTEXT

) DEFAULT CHARSET latin1;

#

# Show how many rows are affected by each statement.

#

#

# Insert some big rows.

#

insert 1024MB data twice

INSERT INTO t1 VALUES (REPEAT('ManyMegaByteBlck', 67108864));