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Description of problem:

With bug 1406885 kernel now requires the new security_label
option to enable security label support. The following upstream
commit is needed:

commit 13e2f9577b88d44001b509e89122ad907805b250
Author: J. Bruce Fields <bfields>
Date:   Thu Jan 12 10:16:42 2017 -0500

    exportfs: support "security_label" export option
    
    On recent kernels only exports with NFSEXP_SECURITY_LABEL set will
    export security labels.
    
    Signed-off-by: J. Bruce Fields <bfields>
    Signed-off-by: Steve Dickson <steved>

*** Bug 1409950 has been marked as a duplicate of this bug. ***

Please find Bug 1406885 Comment #18 for the corresponding kernel (nfsd) patch.

Moving to VERIFIED according to test logs of Comment #7

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://access.redhat.com/errata/RHBA-2017:2233