Re: rspec-core 3.3.0 is broken

> FYI, rspec-core >= 3.3.0 is broken and may cause testsuite hangs in > some cases. https://github.com/rspec/rspec-core/issues/2064. If you experience such a problem try to set `config.threadsafe = false'

rspec-core 3.3.0 is broken

Hi team, FYI, rspec-core >= 3.3.0 is broken and may cause testsuite hangs in some cases. https://github.com/rspec/rspec-core/issues/2064.