bug#40828: core-updates: guix system reconfigure error: guix-1.1.0-1.7dd0539.drv failed

[sirgazil]

## Steps to reproduce

1. guix pull --branch=core-updates
2. guix upgrade
3. sudo guix system reconfigure --fallback os-config.scm


## Expected result

Reconfiguring ends without errors.


## Unexpected result

The whole process failed with this error:

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building /gnu/store/w47hbg05gmnyz5kp3iplyca0mh1vzkma-guix-1.1.0-1.7dd0539.drv...
- 'copy-bootstrap-guile' phasebuilder for 
`/gnu/store/w47hbg05gmnyz5kp3iplyca0mh1vzkma-guix-1.1.0-1.7dd0539.drv' failed 
with exit code 1
build of /gnu/store/w47hbg05gmnyz5kp3iplyca0mh1vzkma-guix-1.1.0-1.7dd0539.drv 
failed
View build log at 
'/var/log/guix/drvs/w4/7hbg05gmnyz5kp3iplyca0mh1vzkma-guix-1.1.0-1.7dd0539.drv.bz2'.
guix system: error: build of 
`/gnu/store/w47hbg05gmnyz5kp3iplyca0mh1vzkma-guix-1.1.0-1.7dd0539.drv' failed
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And the build log said:

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starting phase `copy-bootstrap-guile'
Backtrace:
In ice-9/boot-9.scm:
  1736:10 10 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
           9 (apply-smob/0 #<thunk 7ffff5cccaa0>)
In ice-9/boot-9.scm:
    718:2  8 (call-with-prompt _ _ #<procedure default-prompt-handle…>)
In ice-9/eval.scm:
    619:8  7 (_ #(#(#<directory (guile-user) 7ffff58e9f00>)))
In ice-9/command-line.scm:
   185:18  6 (_ #<input: string 7ffff58e4a10>)
In unknown file:
           5 (eval (begin (use-modules (guix)) (with-store store …)) #)
In guix/store.scm:
   625:15  4 (call-with-store #<procedure 7ffff3101a20 at ice-9/eval…>)
    544:2  3 (open-connection _ #:port _ #:reserve-space? _ # _)
In ice-9/boot-9.scm:
  1736:10  2 (with-exception-handler _ _ #:unwind? _ # _)
In guix/store.scm:
   552:28  1 (_)
In ice-9/boot-9.scm:
  1669:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1669:16: In procedure raise-exception:
ERROR:
  1. &store-connection-error:
      file: "/tmp/guix-tests/var/27130/daemon-socket/socket"
      errno: 2
command "./test-env" "guile" "-c" "(begin (use-modules (guix)) (with-store 
store (let* ((item (add-to-store store \"guile-2.0.9.tar.xz\" #f \"sha256\" 
\"/gnu/store/3aigj659vsjxcrhn0r0vmkbjh3kj5pbs-guile-2.0.9.tar.xz\")) (root 
(string-append \"/tmp/gc-root-\" (basename item)))) (symlink item root) 
(add-indirect-root store root))))" failed with status 1
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## System information

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