Hi Lars-Dominik and Maxim, Lars-Dominik, thank you for the quick reply! Maxim, do you have time to take a look at this bug? Lars-Dominik mentioned that it's possible that your recent changes to patch-and-repack might be related somehow. Lars-Dominik Braun writes: > I’m pretty sure it worked when I submitted the patch. Looking at the > untruncated backtrace and `git blame guix/packages.scm` I’d guess that the > recent changes to patch-and-repack somehow broke this. But that’s really all I > can say unfortunately. Maybe CC Maxim Cournoyer, who made that change > (cfcead2e515c0dae02127e5a76496463898be6b6)? Thank you for the tip. I haven't checked this yet due to lack of time, but I will eventually. I am posting mainly to note that this problem also affects tests/pack.scm, which appears to be the only other test (besides tests/builders.scm) using the with-external-store form. Both tests fail when a guix-daemon is running. So, I think something about the with-external-form is not playing well with the rest of the code, but I don't fully understand the problem yet. More investigation is required... -- Chris