> > The cluster is running OFED [...] I do not see this problem on 2.6.36
> 
> I think you hit this ofed only patch
> http://git.openfabrics.org/git?p=ofed_1_5/linux-
> 2.6.git;a=blob;f=kernel_patches/fixes/mlx4_0290_mcast_loopback.patch;h=786a
> 3926529befac2c2d1fa6d8c36bada79d61a7;hb=HEAD

Yes - this looks like the issue.  thanks
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