Sychronize access to cpuset controller bitmaps.
Sychronize access to cpuset controller bitmaps.

Reported-by: 33a08fff58a2f5908591ffb4bbc82513423b49dc@syzkaller.appspotmail.com
Reported-by: 19c594a7c38184acf053894fe7572a2212eba791@syzkaller.appspotmail.com
PiperOrigin-RevId: 406024052

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