mariabackup process set self Waiting for global read lock status

Version: Mariadb10.3.27
Ha:master - master replicate
backup log:
[00] 2021-03-26 03:14:56 Executing FLUSH TABLES WITH READ LOCK...
[00] 2021-03-26 03:14:56 Kill query timeout 600 seconds.
。。。。。。。。。。。。。
[00] 2021-03-26 03:24:56 Connecting to MySQL server host: 127.0.0.1, user: root, password: set, port: 3306, socket: /data/3306/mysql.sock
[00] 2021-03-26 03:24:56 >> log scanned up to (43997947548)

Check the attachment file info：
show processlist；