Emacs hangs when using tramp with su

[Mathias Millet <mathiasmillet@gmail.com>]

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Hi everyone,
After reinstalling my system, I found out that I couldnt have tramp 
working anymore, it hangs right after i enter my password.

Here is what exactly happens : I type in /C-x C-f /su:root@localhost:/ 
Here emacs asks for my password, which I provide. It then hangs, showing 
the above string in the minibuffer, and after some time : /Tramp: 
Waiting for prompts from remote shell/

After i cancel the operation, i have :

Here is what is in the /tramp/su root@localhost/ buffer :

|Password: Password:
su: incorrect password

Process *tramp/su root@localhost* exited abnormally with code 125
|

And here is what's in /debug tramp/su root@localhost :
/http://pastebin.com/0CKD1yM3

The last line :

|  17:13:59.988240 tramp-file-name-handler (1) # Interrupt received in operation (file-exists-p /su:root@localhost:)|

seems to say that the hangs happens inside *tramp-file-name-handler* or 
*file-exists-p /su:root@localhost:*, but i don't really know what to do 
with that...

I have no idea of what might cause this, the installation is just really 
new (I don't remember if this worked at some point, but there was no 
problem at all before I reinstall).
So if anyone has an idea of what might cause this, I've been searching 
but couldn't find anything really usefull...

Thanks


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