How is it called, when the person you lend your stock to, lend it to someone else, who lends it again to you and you lend it to the first person again? Madness

How is it called, when the person you lend your stock to, lend it to someone else, who lends it again to you and you lend it to the first person again? Madness? (Anyway, my actual knowledge of the stock market is limited, but is my scenario a realistic one?)