unlock(&sched.lock) // unlock so that GODEBUG=scheddetail=1 doesn't hang
		fatal("no goroutines (main called runtime.Goexit) - deadlock!")
	}

	// Maybe jump time forward for playground.
	if faketime != 0 {
		if when := timeSleepUntil(); when < maxWhen {
			faketime = when

			// Start an M to steal the timer.
			pp, _ := pidleget(faketime)
			if pp == nil {

				// should ensure that this segment's
				// VA ≡ Fileoff mod FlagRound.
				seg.Fileoff = uint64(Rnd(int64(prev.Fileoff+prev.Filelen), *FlagRound))
				if seg.Vaddr%uint64(*FlagRound) != seg.Fileoff%uint64(*FlagRound) {
					Exitf("bad segment rounding (Vaddr=%#x Fileoff=%#x FlagRound=%#x)", seg.Vaddr, seg.Fileoff, *FlagRound)
				}
			case objabi.Hwindows: