From RC1 -> RC2, in /tmp/upgrade.log Upgrading nscd. execution of nscd-2.1.92-5 script failed, exit status 1
This defect is considered MUST-FIX for Winston Gold release
I have fixed this in my tree yesterday after noticing it myself (%postun was missing exit 0), but I don't think I can do anything about Pinstripe -> or RC? -> upgrades, because the bad %postun is in the packages which are being removed. Will close this as soon as I build next glibc rpms.
Fixed in nscd-2.1.92-10