MariaDB Server 10.1 online ddl abnormal

One table do twice DDL change different column name in same one command.

the SQL command like alter table tb1 change column1 column2;alter table tb1 change column3 column4.the syntax without of data type's comment.

column1 is int data type and column3 is varchar(64).

first DDL SQL execute time from 11:07:45 to 11:28:16，but not logging in host error file and severely disrupted production，please see host-error-file-ddl-info.pnp file.
second DDL SQL execute time from 11:28:16 to 11:48:30.