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是稳定复现的问题吗？ 可以check下使用时GPU显存是否被占满了

使用32GV100 同样出现该问题。

@huangjun12 可以稳定复现该问题。和当前设备的CUDA版本有关系，10.1的时候必报该错误，11.0则不会报错。

File "./pypaddle/train_mgpu.py", line 284, in train
    loss.backward()
  File "<decorator-gen-128>", line 2, in backward
  File "/opt/_internal/cpython-3.7.0/lib/python3.7/site-packages/paddle/fluid/wrapped_decorator.py", line 25, in __impl__
    return wrapped_func(*args,**kwargs)
  File "/opt/_internal/cpython-3.7.0/lib/python3.7/site-packages/paddle/fluid/framework.py", line 229, in __impl__
    return func(*args,**kwargs)
  File "/opt/_internal/cpython-3.7.0/lib/python3.7/site-packages/paddle/fluid/dygraph/varbase_patch_methods.py", line 249, in backward
    framework._dygraph_tracer())
OSError: (External) CUDNN error(7), CUDNN_STATUS_MAPPING_ERROR. 
  [Hint: 'CUDNN_STATUS_MAPPING_ERROR'.  An access to GPU memory space failed, which is usually caused by a failure to bind a texture.  To correct, prior to the function call, unbind any previously bound textures.  Otherwise, this may indicate an internal error/bug in the library.  ] (at /paddle/paddle/fluid/operators/conv_cudnn_op.cu:758)