“I made it work; problem solved” is a very understandable mindset. A lot of the time the problem is some bug you just didn’t see, it won’t come back, and you’re done. But that 1% of the time it’s something deeper and you (or the next guy) will really want to know what.
The bug itself has already been covered on Lobsters: Intel Skylake/Kaby Lake processors: broken hyper-threading, Skylake bug: a detective story.
“I made it work; problem solved” is a very understandable mindset. A lot of the time the problem is some bug you just didn’t see, it won’t come back, and you’re done. But that 1% of the time it’s something deeper and you (or the next guy) will really want to know what.