Repository: go
Issue: x/build: build failures due to `410 Gone` responses from `symbolic-datum-552` GOPROXY
Labels: Testing,Builders,NeedsInvestigation

```
:: Running /workdir/go/bin/go with args ["/workdir/go/bin/go" "run" "golang.org/x/benchmarks/cmd/bench"] and env ["HOSTNAME=buildlet-linux-amd64-perf-rn8418630" "DEBIAN_FRONTEND=noninteractive" "HOME=/root" "USER=root" "GO_STAGE0_NET_DELAY=0s" "GO_STAGE0_DL_DELAY=100ms" "WORKDIR=/workdir" "GO_BUILDER_NAME=linux-amd64-perf" "GOROOT_BOOTSTRAP=/go1.4" "BENCH_BASELINE_GOROOT=/workdir/gobaseline" "BENCH_BRANCH=master" "GOROOT=/workdir/go" "GOPATH=/workdir/gopath" "GOPROXY=http://gk3-services-nap-jetxd907-8f582974-sbzf.c.symbolic-datum-552.internal:30157" "TMPDIR=/workdir/tmp" "GOCACHE=/workdir/gocache" "PATH=/workdir/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" "PWD=/workdir/gopath/src/golang.org/x/benchmarks"] in dir /workdir/gopath/src/golang.org/x/benchmarks
…
[sweet] Setting up benchmark: go-build
[sweet] error: build go-build for experiment: exit status 1. stderr:
go: github.com/golang-migrate/migrate/v4@v4.6.2 requires
	cloud.google.com/go@v0.37.4 requires
	google.golang.org/genproto@v0.0.0-20190404172233-64821d5d2107: reading http://gk3-services-nap-jetxd907-8f582974-sbzf.c.symbolic-datum-552.internal:30157/google.golang.org/genproto/@v/v0.0.0-20190404172233-64821d5d2107.mod: 410 Gone
	server response: not found: temporarily unavailable
go: downloading github.com/go-redis/redis/v8 v8.0.0
go: downloading github.com/google/safehtml v0.0.2
go: downloading cloud.google.com/go v0.66.0
go: downloading cloud.google.com/go/storage v1.10.0
go: downloading golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
go: downloading cloud.google.com/go/logging v1.0.0
go: downloading contrib.go.opencensus.io/integrations/ocsql v0.1.4
go: downloading github.com/jackc/pgx/v4 v4.12.0
go: downloading google.golang.org/genproto v0.0.0-20200923140941-5646d36feee1
go: downloading contrib.go.opencensus.io/exporter/prometheus v0.1.0
go: downloading contrib.go.opencensus.io/exporter/stackdriver v0.13.4
go: downloading go.opencensus.io v0.22.4
go: downloading golang.org/x/mod v0.3.1-0.20200828183125-ce943fd02449
go: downloading github.com/go-redis/redis_rate/v9 v9.0.2
go: downloading google.golang.org/api v0.32.0
go: downloading github.com/microcosm-cc/bluemonday v1.0.5
go: downloading github.com/russross/blackfriday/v2 v2.0.1
go: downloading github.com/yuin/goldmark v1.4.0
go: downloading github.com/yuin/goldmark-emoji v1.0.1
go: downloading github.com/golang/protobuf v1.4.2
go: downloading google.golang.org/grpc v1.32.0
go: downloading github.com/Masterminds/squirrel v1.4.0
go: downloading github.com/golang-migrate/migrate/v4 v4.6.2
go: downloading github.com/google/licensecheck v0.3.1
go: downloading github.com/lib/pq v1.10.2
go: downloading golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
go: downloading github.com/jackc/pgconn v1.9.0
go: downloading github.com/go-git/go-billy/v5 v5.0.0
go: downloading github.com/go-git/go-git/v5 v5.1.0
go: downloading github.com/evanw/esbuild v0.8.57
go: downloading google.golang.org/protobuf v1.25.0
go: downloading github.com/google/go-cmp v0.5.2
go: downloading golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97
go: downloading github.com/aws/aws-sdk-go v1.34.29
go: github.com/golang-migrate/migrate/v4@v4.6.2 requires
	cloud.google.com/go@v0.37.4 requires
	google.golang.org/genproto@v0.0.0-20190404172233-64821d5d2107: reading http://gk3-services-nap-jetxd907-8f582974-sbzf.c.symbolic-datum-552.internal:30157/google.golang.org/genproto/@v/v0.0.0-20190404172233-64821d5d2107.mod: 410 Gone
	server response: not found: temporarily unavailable
```

`greplogs -l -e '\[sweet\] error: build .*(?:\n.*)*410 Gone' --since=2022-01-01`
[2022-06-22T16:18:44-0fc6e7c-92c9b81/linux-amd64-perf](https://build.golang.org/log/c3c2f08b023932aa198d09c0fd2178cdf7b15758)

It's not obvious to me how the `symbolic-datum-552` proxy gets populated or whether perhaps the `x/benchmarks/sweet` module dependencies are somehow non-hermetic or unstable.

(attn @prattmic @mknyszek; CC @golang/release)