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runtime: "non in-use span in unswept list" flake on darwin-amd64 #22987
https://go-review.googlesource.com/c/go/+/81775 flaked on darwin-amd64 due to:
That sweepgen value looks super bogus. I'm thinking it must be software memory corruption. (Hardware memory corruption would probably be just 1-bit off, rather than a completely different value.)
There was also #22988, which was also a darwin-amd64 flake. This makes me suspect there's something darwin-amd64-specific going on.