> Further testing shows that it's the condition.base_name part of the
> line that is responsible. Here's the code:

>     def base_name
>       self.class.name.split('::').last
>     end

> Amazingly, this seemingly benign method rings a very familiar bell.
> Another developer at Powerset had identified a piece of code in his
> app that looked very much like this and resulted in a HUGE memory leak
> as well. The odd but functional fix that we identified was to create a
> local scope by declaring a local variable. Here's the diff that I will
> try for this test run:

>      def base_name
> +      x = 1
>        self.class.name.split('::').last
>      end