[DO NOT MERGE] Repro memory leak?

[tlrmchlsmth]

    # NOTE(tms): With this initial test run we see logs like this:
    # WARNING 05-06 23:36:44 [block_pool.py:283] Failed to reset prefix cache because some blocks (52) are not freed yet # noqa
    # This doesn't happen if we use input_requests[1], I think because it's
    # 0 then the same prompt runs twice

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[robertgshaw2-redhat]

this is resolved