// timestamps).
	lastSysBlock := make(map[uint64]Timestamp)
	for i := 0; i < events.Len(); i++ {
		ev := events.Ptr(i)
		switch ev.Type {
		case EvGoSysBlock, EvGoInSyscall:
			lastSysBlock[ev.G] = ev.Ts
		case EvGoSysExit:
			ts := Timestamp(ev.Args[2])
			if ts == 0 {
				continue
			}
			block := lastSysBlock[ev.G]
			if block == 0 {