Hi, KiuK!
Yes, I used Ctrl+C to kill the process and the killed process receives the Keyboard Interruption exception.
I have just tried sending SIGTERM to the main python process. However, the training process failed no matter using gloo/nccl as dist backend or c10d/etcd as rdzv backend.
The related log consistent with the former log except for the kill signal is attached: Ubuntu Pastebin
Thanks for your time and looking forward to further investigation and your demo video in the github issue!