You motivated me to look into this more. I wrote a program that just floods stdout and prints what time it got SIGINT and then exits. Of course this program exits immediately when you press C-c.

The program that I have the most trouble with is jlog (https://github.com/jrockway/json-logs). I wrote it so this could very easily be my fault. (I think it's the colors and whatnot, which I have not explored yet.)