binlog.binlog_mysqlbinlog_raw_flush sometimes fails with Errcode: 2 "No such file or directory"

binlog.binlog_mysqlbinlog_raw_flush 'row' w1 [ fail ]

        Test ended at 2022-11-16 16:13:55

CURRENT_TEST: binlog.binlog_mysqlbinlog_raw_flush

/home/buildbot/amd64-ubuntu-1804-bigtest/build/client//mariadb-binlog: File '/home/buildbot/amd64-ubuntu-1804-bigtest/build/mysql-test/var/1/tmp/master-bin.000002' not found (Errcode: 2 "No such file or directory")

mysqltest: At line 36: exec of '/home/buildbot/amd64-ubuntu-1804-bigtest/build/client//mariadb-binlog --defaults-file=/home/buildbot/amd64-ubuntu-1804-bigtest/build/mysql-test/var/1/my.cnf --local-load=/home/buildbot/amd64-ubuntu-1804-bigtest/build/mysql-test/var/tmp/1 /home/buildbot/amd64-ubuntu-1804-bigtest/build/mysql-test/var/1/tmp/master-bin.000002 > /home/buildbot/amd64-ubuntu-1804-bigtest/build/mysql-test/var/1/tmp/local-bin.000002.out' failed, error: 256, status: 1, errno: 0

Output from before failure:

# MYSQL_BINLOG MYSQLTEST_VARDIR/tmp/master-bin.000002 > MYSQLTEST_VARDIR/tmp/local-bin.000002.out

The result from queries just before the failure was:

CREATE TABLE t1 (a int);

FLUSH LOGS;

INSERT INTO t1 VALUES (1);

# timeout TIMEOUT MYSQL_BINLOG --raw --read-from-remote-server --user=root --host=127.0.0.1 --port=MASTER_MYPORT --stop-never --result-file=MYSQLTEST_VARDIR/tmp/ master-bin.000001

# MYSQL_BINLOG MYSQLTEST_VARDIR/tmp/master-bin.000002 > MYSQLTEST_VARDIR/tmp/local-bin.000002.out