How to get a backtrace from a SystemStackError: stack level too deep?

Often I get hard to debug infinite recursions when coding ruby. Is there a way to get a backtrace out of a `SystemStackError` to find out, where exactly the infinite loop occurs? Example Given some methods `foo`, `bar` and `baz` which call each other in a loop: ``` def foo bar end def bar baz end def baz foo end foo ``` When I run this code, I just get the message `test.rb:6: stack level too deep (SystemStackError)`. It would be useful to get at least the last 100 lines of the stack, so I could immediately see this is a loop between `foo`, `bar` and `baz`, like this: ``` test.rb:6: stack level too deep (SystemStackError) test.rb:2:in `foo' test.rb:10:in `baz' test.rb:6:in `bar' test.rb:2:in `foo' test.rb:10:in `baz' test.rb:6:in `bar' test.rb:2:in `foo' [...] ``` Is there any way to accomplish this? EDIT: As you may see from the answer below, Rubinius can do it. Unfortunately some rubinius bugs prevent me from using it with the software I'd like to debug. So to be precise the question is: How do I get a backtrace with MRI (the default ruby) 1.9?