[em3rgent0rdr]

Looking at https://en.wikipedia.org/wiki/List_of_software_bugs there has been several major bugs, e.g. in 2012 Knight Capital Says Trading Glitch Cost It $440 Million, or https://en.wikipedia.org/wiki/Northeast_blackout_of_2003 which lasted up to 4 days and affected 55 million people and resulted in almost 100 deaths.