 Cyber security firm CrowdStrike sank after saying the issue lay in a faulty update. The Dow was down 377 points to finish at 40,287. The Nasdaq lost 144 to 7,726. The S&P 500 dropped 39 points to 55.05. New York oil fell $2.69 to $80.13 per barrel. For the Wall Street Business Report, I'm John Scott.