ENV: Mac OS X 10.10.3 ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14] HOW TO COMPILE: 1. cd to the dir of ruby 2.2.2. 2. ./configure 3. make 4. make install as root. STEPS: 1. Start the irb on console. 2. Type the following code lines in irb: ```ruby require `require 'stringio' require 'bson' sio = StringIO.new 1.to_bson BSON::Int64. from_bson sio ``` sio` 3. The crash happens. Please see also the attached file for all details.