(gdb) p cores[0].running
$4 = (struct thread_entry *) 0x0
(gdb) p cores
$5 = {{
    running = 0x0,
    timeout = 0x1000639c,
    block_task = 0x0,
    rtr = {
      hist = '\000' <repeats 31 times>,
      mask = 0
    },
    next_tmo_check = 252
  }}