System information (version)

• OpenCV => 4.5.0
• Operating System / Platform => Ubuntu 20.04
• Compiler => gcc x64

Detailed description

when loading onnx net converted from Pytorch. segmentation fault occurs.
model:
https://pytorch.org/hub/pytorch_vision_shufflenet_v2/
onnx_file:

net.zip

and map:

Steps to reproduce

cout << "net init begins!" << endl;
net = dnn::readNetFromONNX(modelBin);
cout << "Read done." << endl;

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  answers.opencv.org, Stack Overflow, etc and have not found solution
• I updated to latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc