The stack size of threads is an issue. It can cause random crashes. For code in Real Studio, there is extra code inserted in every method to ensure you get a StackOverflowException. But in C code, this check is not performed. So if you have a full stack and you call into the Real Studio runtime, some DLL or a plugin, the function can overwrite the some objects in memory located behind the end of the stack.
With a tiny stack of just 64 K by default on Mac this is very likely to happen with a little bit of recursion.
So please set stacksize to a higher value like one million bytes.
Also sign on this bug report: 22996: Increase default Thread.Stacksize