testenv.MustHaveExecPath(t, "vmmap")
	cmd := testenv.Command(t, "vmmap", pid)
	out, cmdErr := cmd.Output()
	if cmdErr != nil {
		t.Logf("vmmap output: %s", out)
		if ee, ok := cmdErr.(*exec.ExitError); ok && len(ee.Stderr) > 0 {
			t.Logf("%v: %v\n%s", cmd, cmdErr, ee.Stderr)
			if testing.Short() && strings.Contains(string(ee.Stderr), "No process corpse slots currently available, waiting to get one") {

				cmd.Dir = build.Default.GOROOT
				cmd.Env = append(os.Environ(), "PWD="+cmd.Dir, "GOROOT="+build.Default.GOROOT)
				var output []byte
				output, err = cmd.Output()
				if err != nil {
					if ee, ok := err.(*exec.ExitError); ok && len(ee.Stderr) > 0 {
						err = errors.New(string(ee.Stderr))
					}
					return
				}

				exports := strings.Split(string(bytes.TrimSpace(output)), "\n")
				if len(exports) != 1 {

	cmd := "go"
	args := []string{"list", "-json", fmt.Sprintf("%s/...", treeBase)}
	c := exec.Command(cmd, args...)
	stdout, err := c.Output()
	if err != nil {
		var message string
		if ee, ok := err.(*exec.ExitError); ok {
			message = fmt.Sprintf("%v\n%v", ee, string(ee.Stderr))
		} else {
			message = fmt.Sprintf("%v", err)
		}
		return nil, fmt.Errorf("failed to run `%s %s`: %v", cmd, strings.Join(args, " "), message)
	}

}

// transformToXTablesErrorMessage returns an updated error message with explicit xtables error hints, if applicable.
func transformToXTablesErrorMessage(stderr string, err error) string {
	ee, ok := err.(*exec.ExitError)
	if !ok {
		// Not common, but can happen if file not found error, etc
		return err.Error()
	}
	exitcode := ee.ExitCode()
	if errtypeStr, ok := exittypeToString[XTablesExittype(exitcode)]; ok {