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The kernel-rt sources need updating to include the RHEL7.5.z batch#4 source tree.

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/RHSA-2018:2763

*** Bug 1639486 has been marked as a duplicate of this bug. ***