b.Run(fmt.Sprintf("runtime.GoroutineProfile churn %d", n), withIdle(n, withChurn(benchGoroutineProfile)))
	}
}

var emptyCallStackTestRun int64

// Issue 18836.
func TestEmptyCallStack(t *testing.T) {
	name := fmt.Sprintf("test18836_%d", emptyCallStackTestRun)
	emptyCallStackTestRun++

	t.Parallel()
	var buf strings.Builder
	p := NewProfile(name)

	p.Add("foo", 47674)