Thx~  @rotabulo  Till now I find that if I use torch.rand() to generate input data and label for CNN, this segment fault won’t occur (even with multiGPU). However if I load input data and label with DataLoader, this bug occurs. It seems that this seg fault is related to Dataloader. (Images are loaded with opencv).
This seg fault does not occur with 0.2.0 release version, and only occurs with the latest master version. I also find that if I use python3 not python2, this seg fault disappear, I guess it is related to the multi-thread dataloader.
Hoping these message is helpful to you.