// this here and not e.g. on the trace reader.
	traceFrequency(gen)

	// Collect all the untraced Gs.
	type untracedG struct {
		gp           *g
		goid         uint64
		mid          int64
		stackID      uint64
		status       uint32
		waitreason   waitReason
		inMarkAssist bool
	}
	var untracedGs []untracedG
	forEachGRace(func(gp *g) {
		// Make absolutely sure all Gs are ready for the next