[nspiegelberg]

Although fixing a bug requires analyzing the offending code, we weren't able to effectively narrow down the area of inspection through manual means (diff analysis, stack trace, git bisect). We instead narrowed down the area of code using sandboxing and non-trivial conditional breakpointing.

To fix the SSL library, we first used dup() to properly refcount the FD and then did more long-term restructuring to properly couple the FD & SSL object lifetime later.