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Re:Linus Torvalds: “Do No Harm” by cesarb on Wednesday November 22, 2017 @09:29AM (#15756978)
You might be thinking of KeyKOS, and of the anecdote which can be found at https://lists.inf.ethz.ch/pipermail/oberon/2010/005734.html (it should also be at the EROS homepage, but it's down for me at the moment).

See also: "Crash-only software" https://lwn.net/Articles/191059/

Re:Linus Torvalds: “Do No Harm” by klibertp on Wednesday November 22, 2017 @09:44AM (#15757085)
Yes, exactly this! Thank you.