[clever@amd-nixos:~/apps/nixpkgs]$ nix-build pkgs/top-level/release.nix -A unstable --show-trace
error: while evaluating the attribute ‘constituents’ of the derivation ‘nixpkgs-17.03pre1234.abcdef’ at /home/clever/apps/nixpkgs/pkgs/build-support/trivial-builders.nix:7:14:
while evaluating the attribute ‘buildCommand’ of the derivation ‘test-bootstrap-tools’ at /home/clever/apps/nixpkgs/pkgs/stdenv/linux/make-bootstrap-tools.nix:188:5:
while evaluating anonymous function at /home/clever/apps/nixpkgs/pkgs/stdenv/linux/default.nix:6:1, called from /home/clever/apps/nixpkgs/pkgs/stdenv/linux/make-bootstrap-tools.nix:176:21:
assertion failed at /home/clever/apps/nixpkgs/pkgs/stdenv/linux/make-bootstrap-tools.nix:183:19