// cmd/dist requires GOROOT to be set explicitly in the environment.
	cmd.Env = append(cmd.Environ(), "GOROOT="+testenv.GOROOT(t))

	out, err := cmd.Output()
	if err != nil {
		if ee, ok := err.(*exec.ExitError); ok && len(ee.Stderr) > 0 {
			t.Logf("stderr:\n%s", ee.Stderr)
		}
		t.Fatalf("%v: %v", cmd, err)
	}

	type listEntry struct {
		GOOS, GOARCH string
		CgoSupported bool
		FirstClass   bool

	testenv.MustHaveGoRun(t)
	cmd := testenv.CleanCmdEnv(testenv.Command(t, testenv.GoToolPath(t), "run", "mklockrank.go"))
	want, err := cmd.Output()
	if err != nil {
		if ee, ok := err.(*exec.ExitError); ok && len(ee.Stderr) > 0 {
			t.Fatalf("%v: %v\n%s", cmd, err, ee.Stderr)
		}
		t.Fatalf("%v: %v", cmd, err)
	}
	got, err := os.ReadFile("lockrank.go")
	if err != nil {
		t.Fatal(err)
	}

		cmd := exec.Command(exe, os.Args[1:]...)
		cmd.Stdin = os.Stdin
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
		err := cmd.Run()
		if err != nil {
			if e, ok := err.(*exec.ExitError); ok && e.ProcessState != nil {
				if e.ProcessState.Exited() {
					os.Exit(e.ProcessState.ExitCode())
				}
				base.Fatalf("exec %s: %s", gotoolchain, e.ProcessState)
			}
			base.Fatalf("exec %s: %s", exe, err)

	e.SetStdout(writer)
	err := e.Start()
	if err == nil {
		err = e.Wait()
	}
	data := dataBuffer.Bytes()

	klog.V(4).Infof("Exec probe response: %q", string(data))
	if err != nil {
		exit, ok := err.(exec.ExitError)
		if ok {
			if exit.ExitStatus() == 0 {
				return probe.Success, string(data), nil
			}
			return probe.Failure, string(data), nil
		}

		if errors.Is(err, remote.ErrCommandTimedOut) {

	}

	// run test program in same thread
	cmd = exec.Command(exe)
	out, err = testenv.CleanCmdEnv(cmd).CombinedOutput()
	if err == nil {
		t.Fatal("error expected")
	}
	if _, ok := err.(*exec.ExitError); ok && len(out) > 0 {
		if !bytes.Contains(out, []byte("Exception 0x2a")) {
			t.Fatalf("unexpected failure while running executable: %s\n%s", err, out)
		}
	} else {

	testenv.MustHaveGoBuild(t)
	goCmd, err := testenv.GoTool()
	if err != nil {
		t.Fatal(err)
	}
	pkgList, err := exec.Command(goCmd, "list", "-deps", "runtime").Output()
	if err != nil {
		if err, ok := err.(*exec.ExitError); ok {
			t.Log(string(err.Stderr))
		}
		t.Fatal(err)
	}
	for _, pkg := range strings.Split(strings.TrimRight(string(pkgList), "\n"), "\n") {
		if pkg == "unsafe" {
			continue
		}

func runCmd(t *testing.T, dir string, env []string, path string, args ...string) []byte {
	cmd := exec.Command(path, args...)
	cmd.Dir = dir
	cmd.Env = env
	out, err := cmd.Output()
	if err != nil {
		if ee := (*exec.ExitError)(nil); errors.As(err, &ee) {
			out = append(out, ee.Stderr...)
		}
		t.Fatalf("%s failed:\n%s\n%s", cmd, out, err)
	}
	return out

		// set it to nil to prevent awaitGoroutines from blocking on it.
		c.goroutineErr = nil
	}

	resultc <- ctxResult{err: err}
}

// An ExitError reports an unsuccessful exit by a command.
type ExitError struct {
	*os.ProcessState

	// Stderr holds a subset of the standard error output from the
	// Cmd.Output method if standard error was not otherwise being
	// collected.
	//

			}
			if err := cmd.Run(); err == nil {
				if !sig && dest < 3 {
					t.Errorf("unexpected success of write to closed pipe %d sig %t in child", dest, sig)
				}
			} else if ee, ok := err.(*exec.ExitError); !ok {
				t.Errorf("unexpected exec error type %T: %v", err, err)
			} else if ws, ok := ee.Sys().(syscall.WaitStatus); !ok {
				t.Errorf("unexpected wait status type %T: %v", ee.Sys(), ee.Sys())

	// not have to be killed with SIGKILL.
	cancel()

	io.Copy(stdout, r)
	if stdout.Len() > 0 {
		t.Logf("stdout:\n%s", stdout)
	}
	err = cmd.Wait()

	ee, _ := err.(*exec.ExitError)
	if ee == nil {
		t.Fatalf("unexpectedly finished with nonzero status")
	}
	if len(ee.Stderr) > 0 {
		t.Logf("stderr:\n%s", ee.Stderr)
	}
	if !ee.Exited() {