mariabackup : sporadic "Checksum mismatch in datafile: ibdata1, Space ID:0" during backup

mariabackup.xb_history                   w4 [ fail ]

        Test ended at 2018-05-19 03:42:36

CURRENT_TEST: mariabackup.xb_history

mysqltest: At line 5: exec of '/usr/bin/mariabackup --defaults-file=/run/shm/var/4/my.cnf --history=foo --backup --target-dir=/run/shm/var/4/tmp/backup 2>&1' failed, error: 256, status: 1, errno: 11

Output from before failure:

180519 03:42:36 Connecting to MySQL server host: localhost, user: root, password: set, port: 16020, socket: /run/shm/var/tmp/4/mysqld.1.sock

Using server version 10.3.7-MariaDB-1:10.3.7+maria~trusty-log

/usr/bin/mariabackup based on MariaDB server 10.3.7-MariaDB debian-linux-gnu (i686) 

mariabackup: uses posix_fadvise().

mariabackup: cd to /run/shm/var/4/mysqld.1/data/

mariabackup: open files limit requested 1024, set to 1024

mariabackup: using the following InnoDB configuration:

mariabackup:   innodb_data_home_dir = 

mariabackup:   innodb_data_file_path = ibdata1:12M:autoextend

mariabackup:   innodb_log_group_home_dir = ./

2018-05-19  3:42:36 0 [Note] InnoDB: Number of pools: 1

2018-05-19  3:42:36 0 [Note] InnoDB: Log sequence number at the start 1756947 and the end 1761505 do not match

2018-05-19  3:42:36 0 [ERROR] InnoDB: Checksum mismatch in datafile: ibdata1, Space ID:0, Flags: 0. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting-datadict.html for how to resolve the issue.

mariabackup: Could not open data files.

mariabackup: error: xb_load_tablespaces() failed with error Data structure corruption.