McKenney: Stupid RCU Tricks: rcutorture Catches an RCU Bug

Specifically, that story is told as being first-person from an IBM field engineer*; the issue was that *keys in the user's password* had had their keytops switched while the terminal was being cleaned, and when the user was sitting, he touchtyped the password.

(* That is, when I read it, the writer said "when I was an IBM FE...")