var runtime.crashFD

4 uses

	runtime (current package)
		proc.go#L828: 	crashFD.Store(^uintptr(0))
		runtime.go#L238: 		if fd := crashFD.Load(); fd != ^uintptr(0) {
		runtime.go#L250: var crashFD atomic.Uintptr
		runtime.go#L263: 	old := crashFD.Swap(fd)