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Description of problem:
Besides the usual updates and improvements samba-4.2.x has improved support for SMB2 and SMB3 used by modern Windows versions.

Additionally 4.2.x is a requirement to be able to add features like https://bugzilla.redhat.com/show_bug.cgi?id=910464 or trust to FreeIPA/IdM . Those features will not be available in 4.2.x but will require it.

There is a change in behaviour of the commands 'wbinfo -u' and 'wbinfo -g'. By default the enumerate all users on all trusted domains which can lead to out of memory condition on large installations. Therefore the default has been changed to enumerate only over the own domain (the domain winbind is joined too). We still support the old behaviour, you can enable it with:

wbinfo --domain='*' -u

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2258.html