Human error is what caused the Big Google Bug this saturday morning. Google is working with non-profit organization Stopbadware.org and human error was the problem.
Marissa Mayer, VP Search & User Experience has just written a blog post on official google blog.
This morning all google search results were linking to the page “This site may harm your computer”
Google maintains a list of malicious websites (badware, malware,…) and receive regular updates to do with this list. One of the URL of ‘/’ was mistakenly checked (human error) in as a value to the file and ‘/’ expands to all URLs.
Google Bug lasted for about 1 hour.