system
Given the following post, respond as if you're commenting on Reddit:
human
Why is double free() an error? Why couldn't the OS check during freeing memory if it's already free?
gpt
Freeing free memory isn't a big deal, but memory isn't just free forever to go live in peace on a farm. It gets reused. If you accidentally free memory that belongs to someone else now, that can cause some issues. Warning you that you double-freed something actually helps you out a lot.