mariabackup: error: failed to copy enough redo log

error: failed to copy enough redo log

mariabackup --backup --user=root --use-memory=4G --target-dir /backup

180601 02:01:01 Connecting to MySQL server host: localhost, user: root, password: not set, port: 3306, socket: not set

Using server version 10.2.15-MariaDB-log

/usr/bin/mariabackup based on MariaDB server 10.2.15-MariaDB Linux (x86_64) 

mariabackup: uses posix_fadvise().

mariabackup: cd to /var/lib/mysql/

mariabackup: open files limit requested 0, set to 262144

mariabackup: using the following InnoDB configuration:

mariabackup:   innodb_data_home_dir = 

mariabackup:   innodb_data_file_path = ibdata1:100M:autoextend

mariabackup:   innodb_log_group_home_dir = ./

mariabackup: using O_DIRECT

2018-06-01  2:01:02 140206076119232 [Note] InnoDB: Number of pools: 1

mariabackup: Generating a list of tablespaces

2018-06-01  2:01:02 140206076119232 [Warning] InnoDB: Allocated tablespace ID 2318 for deploy_labels/labels, old maximum was 0

180601 02:01:11 >> log scanned up to (9527405406246)

180601 02:01:11 [01] Copying ibdata1 to /backup/ibdata1

180601 02:01:12 >> log scanned up to (9527405502351)

180601 02:01:52 [01]        ...done

180601 02:01:52 [01] Copying ./deploy_labels/labels.ibd to /backup/deploy_labels/labels.ibd

180601 02:01:52 [01]        ...done

180601 02:01:52 [01] Copying ./deploy_labels/push_events.ibd to /backup/deploy_labels/push_events.ibd

180601 02:01:52 [01]        ...done

180601 02:01:52 [01] Copying ./deploy_labels/images.ibd to /backup/deploy_labels/images.ibd

180601 02:01:52 [01]        ...done

180601 02:01:52 [01] Copying ./deploy_labels/tags.ibd to /backup/deploy_labels/tags.ibd

180601 02:01:52 [01]        ...done

180601 02:01:52 [01] Copying ./deploy_labels/__diesel_schema_migrations.ibd to /backup/deploy_labels/__diesel_schema_migrations.ibd

180601 02:01:52 [01]        ...done

...

180601 03:41:47 Finished backing up non-InnoDB tables and files

180601 03:41:47 [01] Copying aria_log.00000001 to /backup/aria_log.00000001

180601 03:41:47 [01]        ...done

180601 03:41:47 [01] Copying aria_log_control to /backup/aria_log_control

180601 03:41:47 [01]        ...done

180601 03:41:47 [00] Writing xtrabackup_binlog_info

180601 03:41:47 [00]        ...done

180601 03:41:47 Executing FLUSH NO_WRITE_TO_BINLOG ENGINE LOGS...

mariabackup: The latest check point (for incremental): '9528096474361'

mariabackup: Stopping log copying thread.

2018-06-01  3:41:47 140206076119232 [Note] InnoDB: Read redo log up to LSN=9527405501952

180601 03:41:47 >> log scanned up to (9527405501952)

180601 03:41:47 Executing UNLOCK TABLES

180601 03:41:47 All tables unlocked

180601 03:41:47 [00] Copying ib_buffer_pool to /backup/ib_buffer_pool

180601 03:41:47 [00]        ...done

180601 03:41:47 Backup created in directory '/backup/'

MySQL binlog position: filename 'mysql-bin.000004', position '328', GTID of the last change '0-2-6715969130'

180601 03:41:47 [00] Writing backup-my.cnf

180601 03:41:47 [00]        ...done

180601 03:41:47 [00] Writing xtrabackup_info

180601 03:41:47 [00]        ...done

mariabackup: Redo log (from LSN 9527342444268 to 9527405501952) was copied.

mariabackup: error: failed to copy enough redo log (LSN=9527405501952; checkpoint LSN=9528096474361).