An article about a semctl(2) bug on DragonFly, “Make DragonFlyBSD great again!“, has popped up a few times, in comments here, some online forums, and in IRC. I’m linking to it so that I can also say: read all the way to the end and notice the date. The bug was fixed more than 6 months ago. This is not a current security problem, but a (enjoyable) description of how someone in Poland documented it.
Nobody reads anything but headlines, geez.