defer runtime.UnlockOSThread()

	ready <- runtime.Getg()

	x := 2
	debugCallWorker2(stop, &x)
	if x != 1 {
		done <- fmt.Errorf("want x = 2, got %d; register pointer not adjusted?", x)
	}
	close(done)
}

// Don't inline this function, since we want to test adjusting
// pointers in the arguments.
//
//go:noinline
func debugCallWorker2(stop *uint32, x *int) {
	for atomic.LoadUint32(stop) == 0 {