I don't think that this message is really relevant to the bug report. It describes some corrupted store items on my computer and might be interesting as examples of what goes wrong when /gnu/store is writable.
This is on Debian, where /gnu/store is just a "regular directory", without the protection you get on Guix System. I noticed that three store items have been altered somehow: ------ $ guix gc --verify=contents reading the store... checking path existence... checking hashes... path `/gnu/store/4aj0ydxfrbfz2yshlv1qg6kr5qw17mjz-profile' was modified! expected hash `2f0a69784b287ba297082209b928e46b2f8f4925cab00996cd23699a468cc8d1', got `bb3067ed7fa0e11b7f57ad9d4d8428ce9312a1b7d0bd638d7ce16e447e452dee' path `/gnu/store/5kfv0zzf1mmkyl3c9q42piwcb0h3fyzj-profile' was modified! expected hash `9f8281ec9f8e5bc173739b36e8ffc5e088667f17e57e496f51a22f59340d4643', got `b4e187418d96c984f543f50a0fc3709d90056423c66dc09e7548aa06dcdb8e9a' path `/gnu/store/7y3lvk3xf4im8n44337mc6y0ccysvfia-font-dejavu-2.37' was modified! expected hash `5f4f3e0d3eb79e67fc38654a1277709a95ec1ca85253d4c40cb2f9e5514cafa7', got `e726b2163b08b3bd7edb95f29d8e29c0c70ae356d7a4d898ade486b71b0f80ed' ------ None of these are the "missing" profile. Both of the profiles have some suspicious links like these: ------ ls -l /gnu/store/4aj0ydxfrbfz2yshlv1qg6kr5qw17mjz-profile total 20 lrwxrwxrwx 3 root root 62 Dec 31 1969 bin -> /gnu/store/08rk3q8s9qqzph0hah66mx1ws2ssll15-guix-645a28ee9/bin lrwxrwxrwx 1 root root 12 Jan 20 13:27 current-guix -> current-guix lrwxrwxrwx 1 root root 21 Jan 20 13:28 current-guix-112-link -> current-guix-112-link lrwxrwxrwx 1 root root 21 Jan 20 13:28 current-guix-113-link -> current-guix-113-link dr-xr-xr-x 2 root root 4096 Dec 31 1969 etc dr-xr-xr-x 2 root root 4096 Dec 31 1969 lib -r--r--r-- 2 root root 851 Dec 31 1969 manifest dr-xr-xr-x 3 root root 4096 Dec 31 1969 share ------ The timestamps lead me to think I messed these up while trying to workaround the missing profile that spurred this bug report. In the font-dejavu store item, I noticed that not all the files have their timestamps set correctly: ------ /gnu/store/7y3lvk3xf4im8n44337mc6y0ccysvfia-font-dejavu-2.37 └── [Dec 31 1969] share ├── [Dec 31 1969] doc │ └── [Dec 31 1969] font-dejavu-2.37 │ └── [Dec 31 1969] LICENSE ├── [Dec 31 1969] fontconfig │ └── [Dec 31 1969] conf.avail │ ├── [Dec 31 1969] 20-unhint-small-dejavu-sans.conf │ ├── [Dec 31 1969] 20-unhint-small-dejavu-sans-mono.conf │ ├── [Dec 31 1969] 20-unhint-small-dejavu-serif.conf │ ├── [Dec 31 1969] 57-dejavu-sans.conf │ ├── [Dec 31 1969] 57-dejavu-sans-mono.conf │ └── [Dec 31 1969] 57-dejavu-serif.conf └── [Dec 31 1969] fonts ├── [Dec 31 1969] truetype │ ├── [Dec 31 1969] DejaVuMathTeXGyre.ttf │ ├── [Dec 31 1969] DejaVuSans-BoldOblique.ttf │ ├── [Dec 31 1969] DejaVuSans-Bold.ttf │ ├── [Dec 31 1969] DejaVuSansCondensed-BoldOblique.ttf │ ├── [Dec 31 1969] DejaVuSansCondensed-Bold.ttf │ ├── [Dec 31 1969] DejaVuSansCondensed-Oblique.ttf │ ├── [Dec 31 1969] DejaVuSansCondensed.ttf │ ├── [Dec 31 1969] DejaVuSans-ExtraLight.ttf │ ├── [Dec 31 1969] DejaVuSansMono-BoldOblique.ttf │ ├── [Dec 31 1969] DejaVuSansMono-Bold.ttf │ ├── [Dec 31 1969] DejaVuSansMono-Oblique.ttf │ ├── [Dec 31 1969] DejaVuSansMono.ttf │ ├── [Dec 31 1969] DejaVuSans-Oblique.ttf │ ├── [Dec 31 1969] DejaVuSans.ttf │ ├── [Dec 31 1969] DejaVuSerif-BoldItalic.ttf │ ├── [Dec 31 1969] DejaVuSerif-Bold.ttf │ ├── [Dec 31 1969] DejaVuSerifCondensed-BoldItalic.ttf │ ├── [Dec 31 1969] DejaVuSerifCondensed-Bold.ttf │ ├── [Dec 31 1969] DejaVuSerifCondensed-Italic.ttf │ ├── [Dec 31 1969] DejaVuSerifCondensed.ttf │ ├── [Dec 31 1969] DejaVuSerif-Italic.ttf │ ├── [Dec 31 1969] DejaVuSerif.ttf │ └── [Jun 17 2020] .uuid └── [Jun 17 2020] .uuid ------ What's up with those '.uuid' files?