For example, you have a webpage, which outputs some data in random order. One can find hash seed used by this server worker process, then one can DoS this worker by sending special data (which will be treated as hash keys by workers process).
in reply to Re^3: Truly randomized keys() in perl 5.17 - a challenge for testing?
in thread Truly randomized keys() in perl 5.17 - a challenge for testing?
Anyway, it's already in Perl, so I assume one who argue that the change is wrong should show the proof, not the one who asks why it's wrong.