What's your rknn-toolkit version? We need more information to debug this question, such as rknn-toolkit versin, your model. And you can try to close precompile config to see whether it transform passed or not.
rknn-toolkit version is 1.0.0
i am using caffe version of HRNET which has upsample layers.
from the screen, we can see that rknn_toolkit fails to preprocess node UPSAMPLE, and throws segmentation fault.