“This site may harm your computer” caused by human error

What happen with Google when you did a search between 6:30 a.m. PST and 7:25 a.m, you may saw the message “This site may harm your computer” accompanied each and every search result, look at the screenshot below:
From the desk of Official Google Blog This error caused by Human Error. The URL of ‘/’ was mistakenly checked in as a value to the file and ‘/’ expands to all URLs
What happened? Very simply, human error. Google flags search results with the message “This site may harm your computer” if the site is known to install malicious software in the background or otherwise surreptitiously. We do this to protect our users against visiting sites that could harm their computers. We work with a non-profit called StopBadware.org to get our list of URLs. StopBadware carefully researches each consumer complaint to decide fairly whether that URL belongs on the list. Since each case needs to be individually researched, this list is maintained by humans, not algorithms.

