bug#38229: Frequent offloading failures on berlin

[Marius Bakke]

Hello,

Since recently, Berlin sporadically fails during offloading with a
message such as...

Backtrace:
          10 (apply-smob/1 #<catch-closure 7fa16031f1e0>)
In ice-9/boot-9.scm:
    705:2  9 (call-with-prompt _ _ #<procedure default-prompt-handle…>)
In ice-9/eval.scm:
    619:8  8 (_ #(#(#<directory (guile-user) 7fa15ffb5140>)))
In guix/ui.scm:
  1730:12  7 (run-guix-command _ . _)
In guix/scripts/offload.scm:
   768:22  6 (guix-offload . _)
In ice-9/boot-9.scm:
    829:9  5 (catch _ _ #<procedure 7fa15fef9018 at guix/ui.scm:642…> …)
    829:9  4 (catch _ _ #<procedure 7fa15fef9030 at guix/ui.scm:765…> …)
In guix/scripts/offload.scm:
   549:21  3 (process-request _ _ #<derivation /gnu/store/51qzn6nhb…> …)
   481:36  2 (choose-build-machine _)
In guix/inferior.scm:
    157:7  1 (port->inferior _ _)
    204:2  0 (read-repl-response _)

guix/inferior.scm:204:2: In procedure read-repl-response:
Throw to key `match-error' with args `("match" "no matching pattern" #<eof>)'.
guix build: error: unexpected EOF reading a line

This seems to happen randomly, at different times and different machines.

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