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See:
https://github.com/ClusterLabs/libqb/pull/231
https://github.com/ClusterLabs/pacemaker/pull/1166


It's to handle corner cases there were covered prior to CVE fix
in pacemaker, and while those corner cases should in fact be next to
impossible (unless killing the server process manually), and hence
very unlikely in production, it's better to at least partially close
the gap that has been opened + allow for less problemating test runs
of pacemaker using work-in-progress development versions (so that
resources are not exhausted when something goes wrong).

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-2017:1896