I run the nginx.org mainline packages on Ubuntu 12.04, 32- and 64-bit. I use a wacky custom log format, and after 1.5.9 was released today, I enabled logging the $ssl_session_id variable. I later ran an SSL Labs SSL Server Test, [0] which makes numerous HTTPS requests of various sorts, and lo and behold, one of my worker processes core dumped. I fooled around with my configuration and determined tby mnordhoff - Nginx Mailing List - English