I've been looking at this a bit more, it seems to be related to bug #337253:
libc6: getent hangs when called with --service=ldap args
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=337253
In that bug Richard Nelson says:
I've moved from libnss-ldap to libnss-ldapd, and am trying to clean
things up for a hopeful hand-off of the package...
I tried switching to libnss-ldapd also and found that my 'groupadd -r'
command now runs successfully (in a little under 4 seconds).
I guess that means *this* bug should now be associated with Bug#337253.
Ben
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