Comment # 1 on bug 1201338 from Thorsten Kukuk

(In reply to Horst Liesinger from comment #0)
> pam-config --add --sss
> WARNING: module /lib/security/pam_sss.so is not installed.
> 
> /usr/lib64/security/pam_sss.so
> 
> ln -s /usr/lib64/security/pam_sss.so /lib/security/pam_sss.so
> 
> and it works

And will break if you run a 32bit app...

You have a bi-arch system (so you have 32bit and 64bit runtime installed), but
your pam_sss.so module is only installed for 64bit. So if you call a 32bit
binary which tries some authentication, it will fail as it couldn't load the
module.
And in your case, it will fail as a 32bit application cannot execute 64bit
code.

The warning/error is correct. Either you install the 32bit PAM module, or you
remove all 32bit PAM code.