What is the best way to report a (very annoying) bug I found?

I'm using a test instance of London to check out creating scoped applications. I have created a basic scripted rest service and I have some gs.info calls for logging. I discovered that if you log the request data in the manner below with gs.info that it deletes it and subsequent operations don't work:

//any calls accessing properties after this call will return undefined
gs.info(request.body.dataString);
var data = request.body.data;
gr.setValue('caller_id',data.company);

It took me quite a while to figure out that simply removing the logging fixed it and I would like to file a bug to get it fixed. What is the best way to do that?