these 3 derivations will be built:
  /nix/store/9934as57mgmlw9gnxkgggzhv3bvvckbb-iets-fuzzers-0.0.0.drv
  /nix/store/x91gr5c0c63c0h9kiary0fkw03jma6b4-iets-fuzz-diff-0.0.0.drv
  /nix/store/09is31wwsmf5vz10nzdyqrxidk5cgc6z-iets-fuzz-drv-check.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy
could not copy /nix/store/rh8aj1w1lrgxn2hqv75sb49n8pqv16p2-iets-fuzzers-0.0.0: error: gRPC FetchNars failed: failed to connect to all addresses; last error: UNKNOWN: ipv4:65.21.215.17:50051: handshaker shutdown
error: some outputs are unexpectedly invalid