// gcBgMarkWorker goroutine.
type gcBgMarkWorkerNode struct {
	// Unused workers are managed in a lock-free stack. This field must be first.
	node lfnode

	// The g of this worker.
	gp guintptr

	// Release this m on park. This is used to communicate with the unlock
	// function, which cannot access the G's stack. It is unused outside of