//
			// TODO: Make the symbolization done by the execution tracer and CPU
			// profiler match up even in these harder cases. See #53378.
			switch leaf {
			case "runtime._System", "runtime._GC", "runtime._ExternalCode", "runtime._VDSO":
				continue
			}
			stack := strings.Join(fns, "|")
			samples := int(s.Value[0])
			pprofStacks[stack] += samples
		}
	}
	for stack, samples := range pprofStacks {