Infiniband Multicast join not working anymore with Melanox cards - Red Hat Customer Portal

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Issue

After updating the Infiniband machines to RHEL6.4 IB multicast join is not working any longer
After Upgrading some machines to MRG-R 2.3 IB multicast join is not working any more. After downgrading to MRG-R 2.2 or after upgrading the remaining machines to MRG-R 2.3 everything works again.
ibping was always working, but the MC join did not work anymore.
IPoIB is not affected by this.

Environment

Red Hat Enterprise Linux (RHEL) 6.4
Red Hat Enterprise MRG Realtime (MRG-R) 2.3 with kernel-rt-3.6.11-rt28.20.el6rt.x86_64 or newer
Melanox Cards using the mlx4_ib driver

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