FTR, this is an FYI and doesn't block me. I may end up debugging it myself at some point.

Profiling the ruby binary from nixpkgs (2.7.6, 3.0.4, 3.1.2) fails with the standard "Failed to locate Ruby version symbol" error. It's a stripped binary, linking against local versions of every library. (not using distro files)

I don't have further info at this point, but may update in a while.