Computing Guix derivation for 'x86_64-linux'...  
substitute: 
substitute: updating substitutes from 'https://guix.bordeaux.inria.fr'...   0.0%
substitute: updating substitutes from 'https://guix.bordeaux.inria.fr'...  50.0%
substitute: updating substitutes from 'https://guix.bordeaux.inria.fr'... 100.0%
substitute: 
substitute: updating substitutes from 'https://ci.guix.gnu.org'...   0.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'...  50.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: 
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'...   0.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'...  50.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 100.0%
The following derivations will be built:
  /gnu/store/341w2sxl5a7qan2nj64pk7pz6q1djx8r-profile.drv
  /gnu/store/nmbi3kyn46wx9s28zb93vikc7wfxl3j8-guix-61d156957.drv
  /gnu/store/s3aiiyvb4q65kif3vhc1mn0s3kzlmp0w-guix-command.drv
  /gnu/store/8y23b8bv4q168gcdh4bii2x1fzswnlnp-guix-module-union.drv
  /gnu/store/wn24bv9424drkdlj8idqdj0hs14zybza-guix-61d156957-modules.drv
  /gnu/store/ky17q74bi1p4w24d8bz498y1pywzrrxn-guix-packages-base-modules.drv
  /gnu/store/hkk2sihlanq9vmfr74qxmfw4pzckjsvy-guix-packages-base.drv
  /gnu/store/p8079pxrxraw9rd4lkyr7skgbbbcn0a5-guix-system-tests-modules.drv
  /gnu/store/0dk5jddqbbv9mlrcbym0bnxynyzfs2p6-guix-system-tests.drv
  /gnu/store/bhf4bgcxrmla3rxjagx39yy4kymmqdkf-guix-cli.drv
  /gnu/store/14zd3mdndlqm21cc9d3sg4bnviijjzia-guix-cli-core.drv
  /gnu/store/izf7pcx96512dyhjkv649g4glndhh7xw-guix-home.drv
  /gnu/store/lcpm92m6w9k9vxhglprs15ki77jdzs9x-guix-packages.drv
  /gnu/store/zs5wfg3qgjczlgzzz09xfwkgx213ld3h-guix-system.drv
  /gnu/store/qa8rxa6i0rbnjkig1wqyf3rllm48mljg-guix-cli-core-modules.drv
  /gnu/store/r2576wwc59mx4kdm8miq0gbay0hf2l26-guix-home-modules.drv
  /gnu/store/vmjxwy7iadgnjv5rgiqwd9shxh1l1yzg-guix-system-modules.drv
  /gnu/store/z38bc0c9vmmy7wafsg4zv51a0wcaf491-guix-cli-modules.drv
  /gnu/store/zhvbnvx6spwma419bqgh727q7z1scrzd-guix-packages-modules.drv
  /gnu/store/w6f78jrpqda63qv2av2bqzxicnspwbw1-guix-daemon.drv
  /gnu/store/zg2873m1p1nfzpknpivj8z4yrd4bgzaz-guix-hpc.drv
  /gnu/store/hx7ddfl3hc7i4kxrvmah6z6g46szavkb-profile.drv
  /gnu/store/y4c2idr5hzfswc9a4b3wq29x6psr2z53-inferior-script.scm.drv
The following profile hooks will be built:
   /gnu/store/9wqyp7ss17n54cyi3hchydnj9cxrdyv7-info-dir.drv
   /gnu/store/knl3mq5g4anrhar12bd6gm9aadmd0gx0-emacs-subdirs.drv
   /gnu/store/n57yvmw231gd4mq16avaf60m249y5nlc-ca-certificate-bundle.drv
   /gnu/store/s1k4yj6kkkkibl448wbwhmvh64qdxb3d-guix-package-cache.drv
   /gnu/store/wi1ywcbj6qimxgr4zgjwkgn332rx826g-fonts-dir.drv
waiting for locks or build slots...
building path(s) `/gnu/store/mc6cwxw1s4rxpjzkkrchdminmlzaydnx-ca-certificate-bundle'
building path(s) `/gnu/store/z91dba6lsx50daxnb891l4q7pzakdc0i-emacs-subdirs'
building path(s) `/gnu/store/v6zbahyc0pc2ssm2f33xcxc7yfif2wx9-fonts-dir'
building path(s) `/gnu/store/522b2ncbhyy2nwpafi47vxv0h9xa1k15-info-dir'
Backtrace:
In ice-9/boot-9.scm:
  1752:10 12 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
          11 (apply-smob/0 #<thunk 7f851edbb2a0>)
In ice-9/boot-9.scm:
    724:2 10 (call-with-prompt _ _ #<procedure default-prompt-handle?>)
In ice-9/eval.scm:
    619:8  9 (_ #(#(#<directory (guile-user) 7f851edc0c80>)))
In cuirass/ui.scm:
   104:10  8 (run-cuirass-command _ . _)
In cuirass/scripts/evaluate.scm:
   105:27  7 (cuirass-evaluate _)
In ice-9/boot-9.scm:
  1752:10  6 (with-exception-handler _ _ #:unwind? _ # _)
In guix/store.scm:
   661:37  5 (thunk)
  2170:25  4 (run-with-store #<store-connection 256.99 7f851dcb4dc0> ?)
In cuirass/scripts/evaluate.scm:
     87:8  3 (_ _)
In guix/store.scm:
  2042:38  2 (_ #<store-connection 256.99 7f84f29a4af0>)
  1419:15  1 (_ #<store-connection 256.99 7f84f29a4af0> _ _)
In ice-9/boot-9.scm:
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
ERROR:
  1. &store-protocol-error:
      message: "all build users are currently in use; consider creating additional users and adding them to the `guixbuild' group"
      status: 1