1) write seed=0 (skrandom(0) equivalent):
0x0
   after 8s (>=1 loadav draw): 0x7fffffff (expect 0x7fffffff stuck)
   after 16s: 0x7fffffff
2) write seed=0xFFFFFFFE (=2*m):
0xfffffffe
   after 8s: 0x7fffffff (expect 0x7fffffff after 1st draw)
3) control normal seed=0x12345:
0x12345
   after 8s: 0x46183131 (expect evolving, not 0x7fffffff)
8