Here's a neat analysis of a subtle OpenZFS bug by @robnRob 馃挌.
https://despairlabs.com/blog/posts/2025-07-10-an-openzfs-bug-and-the-humans-that-made-it/
I love reading thoughtful analyses of bugs and the factors that produced them. Nowadays I usually arrive somewhat resigned, and expecting a "zeroth order" C bug -- something like bad pointering or failure to initialize a variable.
This is more of a "second order" C bug, and the author goes through the potential tradeoffs and rightfully points out that the answer is not "git gud." I'll put my thoughts on the bug in a reply so as not to spoil it for you.
Anyway, it's a good short read.