Others said this different ways, but I think the scenarios where you don't get an immediate segfault at the bad read/write are the trickiest ones--hard to debug, at least. One flavor is, say, writing past the end of a slice b/c you read the pointer from one slice and len/capacity from another. If it segfaults, it might be later when the clobbered object is next used.

A few years back someone at Dropbox mentioned tricky prod-only races were a real problem for them sometimes, for instance: https://about.sourcegraph.com/go/go-reliability-and-durabili...

That's where I start dreaming about best-effort detection of races in production binaries or even just reducing the chances of torn reads. Years back there might have been other options, like explicit private vs. shared heaps with more controls on the shared heap, but there seems to be a more restricted set of choices now.