// 	_testmain.go:71 +0x170
	data, err := os.ReadFile(crashOutput)
	if err != nil {
		t.Fatalf("child process failed to write crash report: %v", err)
	}
	crash := string(data)
	t.Logf("crash = <<%s>>", crash)
	t.Logf("stderr = <<%s>>", stderr)

	// Check that the crash file and the stderr both contain the panic and stack trace.
	for _, want := range []string{
		"panic: oops",
		"goroutine 1",

		t.Logf("got span %+v, want span %+v", got, want)
		return false
	}
	if len(got.ChildSpans) < len(want.ChildSpans) {
		t.Logf("got %d child spans from, want %d child spans, maybe trace has not be fully reported",
			len(got.ChildSpans), len(want.ChildSpans))
		return false
	} else if len(got.ChildSpans) > len(want.ChildSpans) {

				cagain++
				if cagain > 20 {
					t.Error("looping on EAGAIN")
					return nil
				}
				if err = ss.conn.fd.pfd.WaitWrite(); err != nil {
					t.Logf("client WaitWrite: %v", err)
					return nil
				}
			default:
				// We expect to eventually get an error.
				t.Logf("client WriteOnce: %v", err)
				return nil
			}
		}
	}
	withTCPConnPair(t, client, server)

	close(afterSubTest)
	<-afterSecondLog // Delay the "PASS: TestInterruptor" line until after "CONT  TestLog".
}

func TestLog(t *testing.T) {
	t.Parallel()

	t.Logf("this is the first TestLog log")
	close(afterFirstLog)
	<-afterSubTest
	t.Logf("this is the second TestLog log")
	close(afterSecondLog)

	t.Helper()

	if debugtrace {
		if indir != "" {
			t.Logf("in dir %s: ", indir)
		}
		t.Logf("cmd: %s %+v\n", testenv.GoToolPath(t), bargs)
	}
	cmd := testenv.Command(t, testenv.GoToolPath(t), bargs...)
	cmd.Dir = indir
	b, err := cmd.CombinedOutput()
	if len(b) != 0 {
		t.Logf("## build output:\n%s", b)
	}
	if err != nil {
		t.Fatalf("build error: %v", err)
	}
}

func (c *kubeComponent) InvokeOrFail(t test.Failer, args []string) (string, string) {
	output, stderr, err := c.Invoke(args)
	if err != nil {
		t.Logf("Unwanted exception for 'istioctl %s': %v", strings.Join(args, " "), err)
		t.Logf("Output:\n%v", output)
		t.Logf("Error:\n%v", stderr)
		t.FailNow()
	}
	return output, stderr

}

func (d TestFrontend) Logf(msg string, args ...interface{}) { d.t.Logf(msg, args...) }
func (d TestFrontend) Log() bool                            { return true }

func (d TestFrontend) Fatalf(_ src.XPos, msg string, args ...interface{}) { d.t.Fatalf(msg, args...) }
func (d TestFrontend) Warnl(_ src.XPos, msg string, args ...interface{})  { d.t.Logf(msg, args...) }

// therefore foo can early exit.
func TestRaceRangeFuncIterator(t *testing.T) {
	x := foo(4)
	t.Logf("foo(4)=%d", x)
}

// TestNoRaceRangeFuncIterator does not race because x%5 is never 5,
// therefore foo's loop will not exit early, and this it will not race.
func TestNoRaceRangeFuncIterator(t *testing.T) {
	x := foo(5)
	t.Logf("foo(5)=%d", x)

		out, err := cmd.CombinedOutput()
		if err != nil {
			t.Logf("%s", out)
			t.Fatalf("gccgo %s failed: %s", gofile, err)
		}

		runImporterTest(t, imp, initmap, &test)

		cmd = testenv.Command(t, "ar", "cr", afile, ofile)
		out, err = cmd.CombinedOutput()
		if err != nil {
			t.Logf("%s", out)
			t.Fatalf("ar cr %s %s failed: %s", afile, ofile, err)
		}

	// (broken = runN, b.Negate = true).

	b.Logf("checking target with all changes disabled")
	runN := b.Run("n")

	b.Logf("checking target with all changes enabled")
	runY := b.Run("y")

	var broken *Result
	switch {
	case runN.Success && !runY.Success:
		b.Logf("target succeeds with no changes, fails with all changes")
		b.Logf("searching for minimal set of enabled changes causing failure")