Thank you, that `dmesg` and `swaps` output is the key... We need to manually tell the kernel to stop using this "ghost" swap device. Please run the following commands as **root**:

1.  **Turn off the stale swap entry:**
    ```bash
    swapoff /dev/sda1
    ```

2.  **Verify the swap is gone:**
    ```bash
    cat /proc/swaps
    ```

3.  **Now, perform the rescan procedure again.**
    ...