sweet: reenable gVisor benchmark

The issue preventing the gVisor benchmark from working has magically
been resolved by us doing nothing. Yay! Reenable the benchmark.

... Except the startup benchmark, which does `runsc run`, doesn't work
on the builders. Womp womp. Disable just that benchmark for now; any
coverage here is useful.

Fixes #51445.
Updates #67508.

Change-Id: Ic0bd03038ef392640bf39c801cff2395678a8216
Cq-Include-Trybots: luci.golang.try:x_benchmarks-gotip-linux-amd64-longtest
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/586097
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

sweet/benchmarks/gvisor/main.go

@@ -44,13 +44,17 @@ type benchmark interface {
 
 func main1() error {
 	benchmarks := []benchmark{
-		startup{},
+		// TODO(go.dev/issue/67508): Disable the startup benchmark because it doesn't work
+		// on the builders.
+		// startup{},
 		systemCall{500000},
 		httpServer{20 * time.Second},
 	}
 	if cliCfg.short {
 		benchmarks = []benchmark{
-			startup{},
+			// TODO(go.dev/issue/67508): Disable the startup benchmark because it doesn't work
+			// on the builders.
+			// startup{},
 			systemCall{500},
 			httpServer{1 * time.Second},
 		}
@@ -62,8 +66,8 @@ func main1() error {
 		var buf bytes.Buffer
 		if err := bench.run(&cliCfg, &buf); err != nil {
 			if buf.Len() != 0 {
-				fmt.Fprintln(os.Stderr, "=== Benchmark stdout+stderr ===")
-				fmt.Fprintln(os.Stderr, buf.String())
+				fmt.Fprintf(os.Stderr, "=== Benchmark %s stdout+stderr ===", bench.name())
+				fmt.Fprintf(os.Stderr, "%s\n", buf.String())
 			}
 			return err
 		}

sweet/cmd/sweet/benchmark.go

@@ -95,19 +95,12 @@ var benchmarkGroups = func() map[string][]*benchmark {
 		allBenchmarksMap["etcd"],
 		allBenchmarksMap["go-build"],
 		allBenchmarksMap["gopher-lua"],
-		// TODO(go.dev/issue/51445): Enable once gVisor builds with Go 1.19.
-		// allBenchmarksMap["gvisor"],
+		allBenchmarksMap["gvisor"],
 		allBenchmarksMap["markdown"],
 		allBenchmarksMap["tile38"],
 	}
 
 	for i := range allBenchmarks {
-		switch allBenchmarks[i].name {
-		case "gvisor":
-			// TODO(go.dev/issue/51445): Include in "all"
-			// once gVisor builds with Go 1.19.
-			continue
-		}
 		m["all"] = append(m["all"], &allBenchmarks[i])
 	}
 

sweet/cmd/sweet/integration_test.go

@@ -200,8 +200,7 @@ func TestSweetEndToEnd(t *testing.T) {
 		{"bleve-index", 1},
 		{"gopher-lua", 1},
 		{"markdown", 1},
-		// TODO(go.dev/issue/51445): Enable once gVisor builds with Go 1.19.
-		// {"gvisor", 1},
+		{"gvisor", 1},
 	} {
 		sema.Acquire(context.Background(), shard.weight)
 		wg.Add(1)

sweet/harnesses/gvisor.go

@@ -29,7 +29,7 @@ func (h GVisor) Get(gcfg *common.GetConfig) error {
 		gcfg.SrcDir,
 		"https://github.com/google/gvisor",
 		"go",
-		"adc7bb5e1baf4a7489e428e1fad756e5e2aa3410", // release-20220228.0-4233-gadc7bb5e1
+		"b75aeea", // release-20240513.0-37-g4f08fc481
 	)
 }