Unexpected "aria_sort_buffer_size is too small" error with aria_repair_threads>1

--source include/have_sequence.inc

SET GLOBAL aria_repair_threads= 2;

CREATE TABLE t (a INT, b INT, c VARCHAR(2000), PRIMARY KEY (a), KEY(b), KEY(c)) ENGINE=Aria ROW_FORMAT=DYNAMIC;

INSERT INTO t SELECT seq, seq, 'x' FROM seq_1_to_100;

ALTER TABLE t MODIFY a BIGINT;

select @@aria_sort_buffer_size;

# Cleanup

DROP TABLE t;

select @@aria_sort_buffer_size;

@@aria_sort_buffer_size

268434432

DROP TABLE t;

bug.aria2                                [ fail ]  Found warnings/errors in server log file!

        Test ended at 2023-11-11 01:06:08

line

2023-11-11  1:06:08 0 [ERROR] mariadbd: aria_sort_buffer_size is too small. Current aria_sort_buffer_size: 21845  rows: 101  sort_length: 2010