why does this system build but won't reconfigure?

[George Clemmer]

Hi,

I built a new system w/ 'guix system' using Guix from Git
v0.15.0-3115-g7571ec357 (please see below & sys.scm).

But 'system reconfigure' fails when > 6 sites didn't have
linux-libre-4.17.6 source (guix-reconfigure-linux-libre-4.17.6.log) This
puzzles me ...

Given that the system is built, why do we need to build linux now?

Why can't I grep-find linux-libre-4.17.6 in the Guix working tree?

TIA - George

Details:

guix system --cores=7 --max-jobs=10 -K --on-error=debug build sys.scm
  #+END_SRC

#+RESULTS:
: /gnu/store/4dyijbdi8yi7dw2lj2q7y9cggsbg2f7r-system
The following derivations will be built:
   /gnu/store/kp2l788aj8d698j4jfsy2xwd0dqn90p5-system.drv
   /gnu/store/nx7jsxxii6c4kkwknvqxxgi1qkznbm4h-shepherd-guix-daemon.scm.drv
   /gnu/store/xjqqana8lhqnlp7s3q6wjkcprcp72sc9-shepherd.conf.drv
   /gnu/store/7gb5nwbgq037m4zpx5w8z0xw2m63s7ks-boot.drv
substitute: guix substitute: warning: while fetching 
'https://mirror.hydra.gnu.org/nix-cache-info': 504 ("Gateway Time-out")
substitute: guix substitute: warning: ignoring substitute server at 
'"https://mirror.hydra.gnu.org";'
building 
/gnu/store/nx7jsxxii6c4kkwknvqxxgi1qkznbm4h-shepherd-guix-daemon.scm.drv...
successfully built 
/gnu/store/nx7jsxxii6c4kkwknvqxxgi1qkznbm4h-shepherd-guix-daemon.scm.drv
building /gnu/store/xjqqana8lhqnlp7s3q6wjkcprcp72sc9-shepherd.conf.drv...
successfully built /gnu/store/xjqqana8lhqnlp7s3q6wjkcprcp72sc9-shepherd.conf.drv
building /gnu/store/7gb5nwbgq037m4zpx5w8z0xw2m63s7ks-boot.drv...
successfully built /gnu/store/7gb5nwbgq037m4zpx5w8z0xw2m63s7ks-boot.drv
building /gnu/store/kp2l788aj8d698j4jfsy2xwd0dqn90p5-system.drv...
successfully built /gnu/store/kp2l788aj8d698j4jfsy2xwd0dqn90p5-system.drv
/gnu/store/3sql57akwqv5rk8mvy0rndvl67ribay6-system

guix-reconfigure-linux-libre-4.17.6.log
Description: Binary data

sys.scm
Description: Binary data