let $extra_lsndir=$MYSQLTEST_VARDIR/tmp/extra_lsndir;
mkdir $extra_lsndir;
--disable_result_log
exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --stream=xbstream --extra-lsndir=$extra_lsndir > /dev/null;
--enable_result_log
list_files $extra_lsndir;
rmdir $extra_lsndir;