How about reducing the number of variables during your investigation by fetching the https link without thread first, if that works, then it's probably that the SSL library is not thread safe.
Comment on Re: Segmentation fault using LWP and threads
LWP by itself has no problems. The segfault only occurs when threads are in the picture. How can I check to see if my SSL lib is built thread safe? I assume I need to check both Net::SSLeay and openssl ?