Bad news! --8<---------------cut here---------------start------------->8--- $ guix challenge python-pytorch /gnu/store/dgdswx4vvf07xmhih21n4fnr68dh3fhd-python-pytorch-1.9.0 contents differ: no local build for '/gnu/store/dgdswx4vvf07xmhih21n4fnr68dh3fhd-python-pytorch-1.9.0' https://ci.guix.gnu.org/nar/lzip/dgdswx4vvf07xmhih21n4fnr68dh3fhd-python-pytorch-1.9.0: 0i55iwy3z4da4lhn93dnrmz775s9ga5kyfli6cmrchacacf9xfpq https://bordeaux.guix.gnu.org/nar/lzip/dgdswx4vvf07xmhih21n4fnr68dh3fhd-python-pytorch-1.9.0: 1fl2v4pd0gcw7wp5k662q0zd4lvvzsggcm5ii8b4kq4v6synhkic differing file: /lib/python3.8/site-packages/torch/lib/libtorch_cpu.so 1 store items were analyzed: - 0 (0.0%) were identical - 1 (100.0%) differed - 0 (0.0%) were inconclusive $ guix describe Generacio 189 Aug 30 2021 12:09:27 (nuna) guix f91ae94 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: f91ae9425bb385b60396a544afe27933896b8fa3 --8<---------------cut here---------------end--------------->8--- The file is 165 MiB and Diffoscope (which reads the output of ‘objdump’) takes forever on it. However, by comparing the output of ‘strings’ on each file, we get a hint: