Spider crash on fake loop detection variables

install plugin spider soname 'ha_spider';

set global spider_same_server_link=1;

eval create server srv

  foreign data wrapper mysql

  options (

    host 'localhost',

    user 'root',

    socket '$MASTER_MYSOCK'

  );

create table t1 (id int primary key, data varchar(255));

insert into t1 values (1, 'test'), (2, 'data');

create table st1 (id int primary key, data varchar(255)) engine=spider

comment='wrapper "mysql", srv "srv", table "t1"';

set @`spider_lc_./test/st1` = concat('-', repeat('x', 900000), '-pid-tbl-');

select * from st1 limit 1;

uninstall plugin spider;