Why does Infiniband on RHEL 6.6 loses connectivity after opensm failover ?

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Issue

Infiniband stops working after some time on RHEL 6.6 and has to be rebooted ?
system hung during shutdown after updating to RHEL 6.6 while Unloading OpenIB kernel modules.

Environment

Red Hat Enterprise Linux(RHEL) 6.6.
Infiniband Hardware.
kernel-2.6.32-504.8.1.el6.

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