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Pining localhost on an infiniband connection can trigger a BUG_ON()
and cause a denial of service.

Fix identified by comparison of the RHEL source rpms.

CVE-2012-2372
BugLink: http://bugs.launchpad.net/bugs/1016299

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>