That sir, is a bug that should be reported on bugs.ruby-lang while true do "a" * (1024 ** 2) end it is to do with the dynamic malloc limit growing

That sir, is a bug that should be reported on bugs.ruby-lang while true do "a" * (1024 ** 2) end it is to do with the dynamic malloc limit growing too much, should be fairly trivial to patch in the next 2.1 release