On Sat, 02 May 2009 20:52:39 -0400
Valmor de Almeida <val.gen...@gmail.com> wrote:

> After a system/world update my user account dealmeida cannot be logged 
> to or root cannot su to it. When su - dealmeida is issued at the root 
> command prompt, it immediately returns to root. When login is at the 
> console the motd appears (twice; why?) and then the session is closed. 
> In the /var/log/messages I get
> 
> May  2 20:42:35 xeon0 su[29286]: Successful su for dealmeida by root
> May  2 20:42:35 xeon0 su[29286]: + pts/1 root:dealmeida
> May  2 20:42:35 xeon0 su[29286]: pam_unix(su:session): session opened 
> for user dealmeida by root(uid=0)
> May  2 20:42:35 xeon0 su[29286]: pam_unix(su:session): session closed 
> for user dealmeida
> 
> No other account has this problem.
> 
> Any ideas?

I don't know about motd, but the rest looks like pam problem to me, if
you're using pam, of course. Try 'euse -i pam' to see if it's enabled.

If that's the case, first of all I'd suggest to check etc-update.
Then look through /etc/pam.d, especially system-* files. There you can
remove some of the required (for successfull authentication) modules,
so their failure won't affect the process.

-- 
Mike Kazantsev // fraggod.net

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