Hold d.parent.mu when reading d.name
Hold d.parent.mu when reading d.name

PiperOrigin-RevId: 203041657
Change-Id: I120783d91712818e600505454c9276f8d9877f37

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor