Cannot su

[18Googol2]

I have had a problem since I started using zsh and I havent worked out how to fix it.

Looks like su doesnt like zsh. In the same machine, I can su to root or any user fine. Never have luck with zsh, it always complain:

[0:2]gu@server~su                                                                                                     
Password:
zsh: suspended (signal)  su

Im 100% sure the password is correct. I can do sudo fine

Any idea how to fix it? It really annoys me. Thanks