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Description of problem:
When querying domain groups for a user via nsswitch/winbindd the buffer passed
to libnss_winbind is too small (about 1k).
libnss_winbind returns NSS_TRYAGAIN and sets errno=ERANGE.
As far as I can tell, glibc never "trys again" it just fails, so all calls to
getgrgid fail for groups that have a lot of members.

I have only tested this using winbind, it is the only nss component I have
installed that will return large numbers of users/groups.

As a result, users cannot authenticate to my Samba server when it's set for
domain security.


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.Configure samba with "security = domain" and to use winbind
2.Add winbind to passwd and group lines of /etc/nsswitch.conf
3.Issue "groups <domain user>" at the command prompt.
    

Actual Results:  (long pause)
id: cannot find name for group ID 10001 (or some other number in winbind's range)


Expected Results:  List of domain groups the user belongs to

Additional info:

Works fine in RedHat 7.3