May have encountered a bug in the Ruby interpreter or extension libraries.
Third Party's Issue
ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin16]
When I run the "rails test", the crash happened.
PS: I uploaded a report of my terminal, but i don't know if it's useful. (English isn't my first language, so please excuse any mistakes : )