# Bug report ### Bug description: The `reversed` builtin is not thread safe. The same element from a sequence can be returned multiple times. ### CPython versions tested on: CPython main branch ### Operating systems tested on: Windows <!-- gh-linked-prs --> ### Linked PRs * gh-120609 * gh-120971 * gh-125734 * gh-135535 * gh-135558 <!-- /gh-linked-prs -->