Hi Jack, Jack Hill writes: > On Sun, 14 Mar 2021, Mark H Weaver wrote: > >> (1) You must *delete* the "older" system generations and user profiles >> e.g. by running "guix system delete-generations" and "guix package >> --delete-generations", or else "guix gc" won't clear them from your >> store. It is not enough to merely switch to an older system >> generation and profiles. >> >> (2) You'll also need to actually reboot into the older system >> generation, because /run/booted-system will continue to protect >> (from GC) the system that you last booted into, even after you >> switch systems. >> >> Did you do those things before running "guix gc"? > > Oops, I left out those details. Yes, I did both those things. It occurs to me that we missed something: the profiles in ~/.config/guix/current that are managed by "guix pull". It might be that code within Guix itself was miscompiled (e.g. gnu/build/svg.scm), or else that a profile in ~/.config/guix/current is still holding a reference to something else that was miscompiled, (e.g. guile-cairo). I suggest "guix pull --commit=453e101fc3f7dac9aabcd6122cf05fb7925103c7", and then "guix package -p ~/.config/guix/current --delete-generations" to delete any generations of Guix at commits that came after the Cairo graft (use "guix pull --list-generations" to list them). Do this for all user accounts (including root) that have a ~/.config/guix/current directory. Then, try "guix gc" again. Thanks, Mark