Hi Ludo, > The patch below seems to fix the problem: (guix monads) has shared state > (hash tables) used both at expansion-time and run-time, and it wasn’t > protected. > > My hypothesis is that this was causing random memory corruption. The > weird thing, though, is that the errors we were getting were not so > random. Also, the load phase of ‘guix pull’ is sequential. > > Could you test it and report back? This doesn’t seem to be enough to fix the problem. I patched ~/guix and ran “guix pull --url=$PWD” from ~/guix: --8<---------------cut here---------------start------------->8--- [rwurmus@murphy:~/guix] (335) $ time ./pre-inst-env guix pull --url=$PWD guile: warning: failed to install locale warning: failed to install locale: Invalid argument Updating from Git repository at '/home/rwurmus/guix'... Building from Git commit d24c69d86670bfad0c6bb147162c918e9fcdccc2... substitute: guile: warning: failed to install locale substitute: warning: failed to install locale: Invalid argument guix pull: warning: failed to load '(bimsb packages bioinformatics-nonfree)': ERROR: no code for module (gnu packages zip) guix pull: warning: failed to load '(bimsb packages staging)': ERROR: no code for module (gnu packages zip) substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0% The following derivation will be built: /gnu/store/y54b92jj44li36743fgxzy0iagi6gb9n-guix-latest.drv copying and compiling to '/gnu/store/p5zlw7fas26bickkqz4d68g8bxnjr14z-guix-latest' with Guile 2.2.2... loading... 25.8% of 640 filesrandom seed for tests: 1507927861 loading... 99.8% of 640 files compiling... 18.6% of 640 filesIn thread: ERROR: In procedure return: return used outside of 'with-monad'Error while printing exception. compiling... 70.0% of 640 files --8<---------------cut here---------------end--------------->8--- The higher the percentage of completion, the slower this all gets. It hasn’t actually finished yet, even though it has been running for over 13 minutes. -- Ricardo GPG: BCA6 89B6 3655 3801 C3C6 2150 197A 5888 235F ACAC https://elephly.net