x/build: test failures due to 5xx errors in GOPROXY forwarding

[bcmills]

#!watchflakes
post <- (test == "" ||
	pkg == "golang.org/x/vuln" && test == "TestGoModTidy") &&
	log ~ `http://.*symbolic-datum-552.*: 5\d\d .+`

2023-02-23 22:09 windows-amd64-longtest build@da6c8bff go@e153905a [build] (log)

internal\cloud\aws.go:16:2: github.com/aws/aws-sdk-go@v1.30.15: reading http://gk3-services-nap-jetxd907-311fef32-6bpt.c.symbolic-datum-552.internal:30157/github.com/aws/aws-sdk-go/@v/v1.30.15.zip: 503 Service Unavailable
	server response: Service Unavailable
internal\cloud\aws.go:17:2: github.com/aws/aws-sdk-go@v1.30.15: reading http://gk3-services-nap-jetxd907-311fef32-6bpt.c.symbolic-datum-552.internal:30157/github.com/aws/aws-sdk-go/@v/v1.30.15.zip: 503 Service Unavailable
	server response: Service Unavailable
internal\cloud\aws.go:18:2: github.com/aws/aws-sdk-go@v1.30.15: reading http://gk3-services-nap-jetxd907-311fef32-6bpt.c.symbolic-datum-552.internal:30157/github.com/aws/aws-sdk-go/@v/v1.30.15.zip: 503 Service Unavailable
	server response: Service Unavailable
internal\cloud\aws.go:19:2: github.com/aws/aws-sdk-go@v1.30.15: reading http://gk3-services-nap-jetxd907-311fef32-6bpt.c.symbolic-datum-552.internal:30157/github.com/aws/aws-sdk-go/@v/v1.30.15.zip: 503 Service Unavailable
	server response: Service Unavailable
internal\cloud\aws.go:20:2: github.com/aws/aws-sdk-go@v1.30.15: reading http://gk3-services-nap-jetxd907-311fef32-6bpt.c.symbolic-datum-552.internal:30157/github.com/aws/aws-sdk-go/@v/v1.30.15.zip: 503 Service Unavailable
	server response: Service Unavailable
internal\cloud\aws.go:21:2: github.com/aws/aws-sdk-go@v1.30.15: reading http://gk3-services-nap-jetxd907-311fef32-6bpt.c.symbolic-datum-552.internal:30157/github.com/aws/aws-sdk-go/@v/v1.30.15.zip: 503 Service Unavailable
	server response: Service Unavailable
cmd\buildlet\buildlet.go:45:2: github.com/aws/aws-sdk-go@v1.30.15: reading http://gk3-services-nap-jetxd907-311fef32-6bpt.c.symbolic-datum-552.internal:30157/github.com/aws/aws-sdk-go/@v/v1.30.15.zip: 503 Service Unavailable
	server response: Service Unavailable

(Pulled out from #55313 (comment).)

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- test == "" && log ~ `http://.*symbolic-datum-552.*: 5\d\d .+`

2023-08-11 14:56 windows-amd64-longtest exp@89c5cff7 go@5af4b348 [build] (log)

conn.go:14:2: golang.org/x/exp/event@v0.0.0-20220217172124-1812c5b45e43: reading http://gk3-services-nap-jetxd907-8f582974-rj7t.c.symbolic-datum-552.internal:30157/golang.org/x/exp/event/@v/v0.0.0-20220217172124-1812c5b45e43.mod: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/exp/event/@v/v0.0.0-20220217172124-1812c5b45e43.mod": read tcp 10.102.128.14:55038->209.85.200.141:443: read: connection reset by peer

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- test == "" && log ~ `http://.*symbolic-datum-552.*: 5\d\d .+`

2023-08-24 16:41 linux-arm64-longtest tools@c28af0ab go@fe2c686b (log)

internal/bug/bug.go:22:2: golang.org/x/telemetry@v0.0.0-20230821195303-8cbe8f819be9: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/golang.org/x/telemetry/@v/v0.0.0-20230821195303-8cbe8f819be9.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/telemetry/@v/v0.0.0-20230821195303-8cbe8f819be9.zip": read tcp 10.102.129.132:43282->209.85.146.141:443: read: connection reset by peer
internal/govulncheck/vulncache.go:14:2: golang.org/x/vuln@v0.0.0-20230110180137-6ad3e3d07815: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/golang.org/x/vuln/@v/v0.0.0-20230110180137-6ad3e3d07815.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/vuln/@v/v0.0.0-20230110180137-6ad3e3d07815.zip": read tcp 10.102.129.132:43282->209.85.146.141:443: read: connection reset by peer
internal/govulncheck/types_118.go:12:2: golang.org/x/vuln@v0.0.0-20230110180137-6ad3e3d07815: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/golang.org/x/vuln/@v/v0.0.0-20230110180137-6ad3e3d07815.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/vuln/@v/v0.0.0-20230110180137-6ad3e3d07815.zip": read tcp 10.102.129.132:43282->209.85.146.141:443: read: connection reset by peer
internal/govulncheck/util.go:13:2: golang.org/x/vuln@v0.0.0-20230110180137-6ad3e3d07815: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/golang.org/x/vuln/@v/v0.0.0-20230110180137-6ad3e3d07815.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/vuln/@v/v0.0.0-20230110180137-6ad3e3d07815.zip": read tcp 10.102.129.132:43282->209.85.146.141:443: read: connection reset by peer
../../../../../pkg/mod/mvdan.cc/gofumpt@v0.4.0/format/format.go:25:2: github.com/google/go-cmp@v0.5.9: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/github.com/google/go-cmp/@v/v0.5.9.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/github.com/google/go-cmp/@v/v0.5.9.zip": read tcp 10.102.129.132:43282->209.85.146.141:443: read: connection reset by peer
internal/vulncheck/command.go:29:2: golang.org/x/vuln@v0.0.0-20230110180137-6ad3e3d07815: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/golang.org/x/vuln/@v/v0.0.0-20230110180137-6ad3e3d07815.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/vuln/@v/v0.0.0-20230110180137-6ad3e3d07815.zip": read tcp 10.102.129.132:43282->209.85.146.141:443: read: connection reset by peer
internal/telemetry/telemetry.go:16:2: golang.org/x/telemetry@v0.0.0-20230821195303-8cbe8f819be9: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/golang.org/x/telemetry/@v/v0.0.0-20230821195303-8cbe8f819be9.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/telemetry/@v/v0.0.0-20230821195303-8cbe8f819be9.zip": read tcp 10.102.129.132:43282->209.85.146.141:443: read: connection reset by peer
doc/generate.go:33:2: github.com/jba/printsrc@v0.2.2: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/github.com/jba/printsrc/@v/v0.2.2.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/github.com/jba/printsrc/@v/v0.2.2.zip": read tcp 10.102.129.132:43282->209.85.146.141:443: read: connection reset by peer
internal/lsp/tests/util.go:19:2: github.com/google/go-cmp@v0.5.9: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/github.com/google/go-cmp/@v/v0.5.9.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/github.com/google/go-cmp/@v/v0.5.9.zip": read tcp 10.102.129.132:43282->209.85.146.141:443: read: connection reset by peer

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- test == "" && log ~ `http://.*symbolic-datum-552.*: 5\d\d .+`

2023-08-22 16:57 linux-386-clang perf@3c60af34 go@0a17b2c1 (log)

../../../../pkg/mod/gonum.org/v1/plot@v0.10.0/text/latex.go:13:2: github.com/go-latex/latex@v0.0.0-20210823091927-c0d11ff05a81: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/github.com/go-latex/latex/@v/v0.0.0-20210823091927-c0d11ff05a81.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/github.com/go-latex/latex/@v/v0.0.0-20210823091927-c0d11ff05a81.zip": read tcp 10.102.129.132:49046->142.250.125.141:443: read: connection reset by peer
../../../../pkg/mod/gonum.org/v1/plot@v0.10.0/text/latex.go:14:2: github.com/go-latex/latex@v0.0.0-20210823091927-c0d11ff05a81: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/github.com/go-latex/latex/@v/v0.0.0-20210823091927-c0d11ff05a81.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/github.com/go-latex/latex/@v/v0.0.0-20210823091927-c0d11ff05a81.zip": read tcp 10.102.129.132:49046->142.250.125.141:443: read: connection reset by peer
../../../../pkg/mod/gonum.org/v1/plot@v0.10.0/text/latex.go:15:2: github.com/go-latex/latex@v0.0.0-20210823091927-c0d11ff05a81: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/github.com/go-latex/latex/@v/v0.0.0-20210823091927-c0d11ff05a81.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/github.com/go-latex/latex/@v/v0.0.0-20210823091927-c0d11ff05a81.zip": read tcp 10.102.129.132:49046->142.250.125.141:443: read: connection reset by peer
../../../../pkg/mod/gonum.org/v1/plot@v0.10.0/text/latex.go:16:2: github.com/go-latex/latex@v0.0.0-20210823091927-c0d11ff05a81: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/github.com/go-latex/latex/@v/v0.0.0-20210823091927-c0d11ff05a81.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/github.com/go-latex/latex/@v/v0.0.0-20210823091927-c0d11ff05a81.zip": read tcp 10.102.129.132:49046->142.250.125.141:443: read: connection reset by peer
../../../../pkg/mod/gonum.org/v1/plot@v0.10.0/vg/vgpdf/vgpdf.go:24:2: github.com/go-pdf/fpdf@v0.5.0: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/github.com/go-pdf/fpdf/@v/v0.5.0.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/github.com/go-pdf/fpdf/@v/v0.5.0.zip": read tcp 10.102.129.132:49046->142.250.125.141:443: read: connection reset by peer

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- test == "" && log ~ `http://.*symbolic-datum-552.*: 5\d\d .+`

2023-08-22 16:07 linux-amd64-alpine telemetry@17171dbf go@b303fb48 (log)

../../../../../pkg/mod/cloud.google.com/go/storage@v1.30.1/bucket.go:27:2: cloud.google.com/go/compute/metadata@v0.2.3: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/cloud.google.com/go/compute/metadata/@v/v0.2.3.mod: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/cloud.google.com/go/compute/metadata/@v/v0.2.3.mod": read tcp 10.102.129.132:49142->209.85.147.141:443: read: connection reset by peer

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- test == "" && log ~ `http://.*symbolic-datum-552.*: 5\d\d .+`

2023-08-04 16:56 freebsd-386-12_3 image@2b687b56 go@789b3f84 (log)

go: golang.org/x/text@v0.12.0 requires
	golang.org/x/mod@v0.8.0 requires
	golang.org/x/tools@v0.1.12 requires
	golang.org/x/mod@v0.6.0-dev.0.20220419223038-86c51ed26bb4 requires
	golang.org/x/crypto@v0.0.0-20210921155107-089bfa567519 requires
	golang.org/x/net@v0.0.0-20210226172049-e18ecbb05110: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/golang.org/x/net/@v/v0.0.0-20210226172049-e18ecbb05110.mod: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/net/@v/v0.0.0-20210226172049-e18ecbb05110.mod": read tcp 10.102.129.132:55748->142.250.125.141:443: read: connection reset by peer

2023-08-25 19:10 openbsd-386-72 pkgsite@ecfc750c go@789b3f84 x/pkgsite/internal/source [build] (log)

internal/source/source_test.go:21:2: github.com/google/go-replayers/httpreplay@v1.0.0: reading http://gk3-services-nap-jetxd907-d9790f34-r2hr.c.symbolic-datum-552.internal:30157/github.com/google/go-replayers/httpreplay/@v/v1.0.0.mod: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/github.com/google/go-replayers/httpreplay/@v/v1.0.0.mod": read tcp 10.102.129.132:55748->142.250.125.141:443: read: connection reset by peer

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- test == "" && log ~ `http://.*symbolic-datum-552.*: 5\d\d .+`

2023-09-07 20:19 windows-amd64-longtest pkgsite@48986c11 go@dfbf809f (log)

..\..\..\..\pkg\mod\github.com\jackc\pgx\v4@v4.14.1\stdlib\sql.go:67:2: github.com/jackc/pgtype@v1.9.1: reading http://gk3-services-nap-jetxd907-8f582974-2sjh.c.symbolic-datum-552.internal:30157/github.com/jackc/pgtype/@v/v1.9.1.mod: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/github.com/jackc/pgtype/@v/v1.9.1.mod": read tcp 10.102.128.3:58826->173.194.74.141:443: read: connection reset by peer

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- test == "" && log ~ `http://.*symbolic-datum-552.*: 5\d\d .+`

2023-09-20 15:44 linux-386-bullseye tools@0669fa31 go@1ac43e76 [build] (log)

cmd/auth/authtest/authtest.go:21:2: golang.org/x/sys@v0.12.0: reading http://gk3-services-nap-jetxd907-8f582974-kvbz.c.symbolic-datum-552.internal:30157/golang.org/x/sys/@v/v0.12.0.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/sys/@v/v0.12.0.zip": read tcp 10.102.128.4:40308->74.125.124.141:443: read: connection reset by peer
cmd/html2article/conv.go:21:2: golang.org/x/net@v0.15.0: reading http://gk3-services-nap-jetxd907-8f582974-kvbz.c.symbolic-datum-552.internal:30157/golang.org/x/net/@v/v0.15.0.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/net/@v/v0.15.0.zip": read tcp 10.102.128.4:40308->74.125.124.141:443: read: connection reset by peer
cmd/html2article/conv.go:22:2: golang.org/x/net@v0.15.0: reading http://gk3-services-nap-jetxd907-8f582974-kvbz.c.symbolic-datum-552.internal:30157/golang.org/x/net/@v/v0.15.0.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/net/@v/v0.15.0.zip": read tcp 10.102.128.4:40308->74.125.124.141:443: read: connection reset by peer
playground/socket/socket.go:36:2: golang.org/x/net@v0.15.0: reading http://gk3-services-nap-jetxd907-8f582974-kvbz.c.symbolic-datum-552.internal:30157/golang.org/x/net/@v/v0.15.0.zip: 500 Internal Server Error
	server response: Get "https://proxy.golang.org/golang.org/x/net/@v/v0.15.0.zip": read tcp 10.102.128.4:40308->74.125.124.141:443: read: connection reset by peer

— watchflakes