BUG: gpu to_cpu() error

[luweizheng]

python/xorbits/_mars/tensor/base/tests/test_base_execution.py

    @require_cupy
    def test_to_gpu_execution(setup_gpu):
        raw = np.random.rand(10, 10)
        x = tensor(raw, chunk_size=3)

        gx = to_gpu(x)

>       res = gx.execute().fetch(to_cpu=False)

xorbits/_mars/tensor/base/tests/test_base_execution.py:1142:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
xorbits/_mars/core/entity/tileables.py:430: in execute
    result = self.data.execute(session=session, **kw)
xorbits/_mars/core/entity/executable.py:152: in execute
    return execute(self, session=session, **kw)
xorbits/_mars/deploy/oscar/session.py:1789: in execute
    return session.execute(
xorbits/_mars/deploy/oscar/session.py:1600: in execute
    execution_info: ExecutionInfo = fut.result(
/opt/conda/lib/python3.12/concurrent/futures/_base.py:456: in result
    return self.__get_result()
/opt/conda/lib/python3.12/concurrent/futures/_base.py:401: in __get_result
    raise self._exception