failed to map memory errno = Device or resource busy 如何解决

系统为ubuntu20.04  运行官方demo报错如下post process config: box_conf_threshold = 0.25, nms_threshold = 0.45
Read ./model/bus.jpg ...
img width = 640, img height = 640
Loading mode...
E RKNN: [03:41:02.444] failed to map memory errno = Device or resource busy
E RKNN: [03:41:02.444] failed to malloc npu memory!, size: 8189440, flags: 0x2
E RKNN: [03:41:02.445] rknn_init, load model failed!
rknn_init error ret=-6

请问大佬们该如何解决？感谢！