BUILD_CLEAN
poison byte = 0x2d (bit7 RUNNING = clear)
after 31 failing poll iterations: reinited=1 (garbage regs.stat=0x2d decided)
RESULT: re-init decision taken from UNINITIALIZED regs.stat (byte 0x2d, RUNNING bit clear)
poison byte = 0xcd (bit7 RUNNING = set)
after 40 failing poll iterations: reinited=0 (garbage regs.stat=0xcd decided)
RESULT: no re-init (byte 0xcd had RUNNING bit set)