I regret making that error. The following resources offer more details on the occurrences I mentioned:

http://www.nytimes.com/1991/06/07/business/att-malfunction-in-new-switch-system-led-to-long-distance-outage.html is the link to the New York Times article on the AT&T 3B2 error.

Therac-25 radiation therapy machine page on IEEE Spectrum contains the following error: https://spectrum.ieee.org/therac25

Computer system failures and their effects are discussed in an article by the IEEE Computer Society at this link: https://www.computer.org/publications/tech-news/trends/computer-system-failures-their-impact-and-lessons-learned

I hope these resources give you further background and knowledge on the subject. If you have any further inquiries, please let me know.
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