Hi,
 seems that with a change made in upstream to the rdma package (no
more udev rules)
the infiniband devices get created by the kernel with the wrong permissions.

[root@brux ~]# rpm -qa | grep rdma
librdmacm-utils-1.0.15-2.el6.x86_64
librdmacm-devel-1.0.15-2.el6.x86_64
librdmacm-1.0.15-2.el6.x86_64
rdma-3.3-3.el6.noarch
[root@brux ~]# cat /etc/redhat-release
Scientific Linux release 6.3 (Carbon)
[root@brux ~]# rpm -ql rdma
/etc/rc.d/init.d/nfs-rdma
/etc/rc.d/init.d/rdma
/etc/rdma
/etc/rdma/fixup-mtrr.awk
/etc/rdma/rdma.conf
/etc/sysconfig/network-scripts/ifdown-ib
/etc/sysconfig/network-scripts/ifup-ib
[root@brux ~]# ll /dev/infiniband/
total 0
crw-rw---- 1 root root 231,  64 Aug 13 15:27 issm0
crw-rw---- 1 root root 231,  65 Aug 13 15:27 issm1
crw-rw---- 1 root root  10,  57 Aug 13 15:27 rdma_cm
crw-rw---- 1 root root 231, 224 Aug 13 15:27 ucm0
crw-rw---- 1 root root 231,   0 Aug 13 15:27 umad0
crw-rw---- 1 root root 231,   1 Aug 13 15:27 umad1
crw-rw---- 1 root root 231, 192 Aug 13 15:27 uverbs0


This prevents non-root users from using the infiniband.

Installing the mellanox provided OFED on top of SL 6.3 gives the
devices with the correct permissions:


[root@brux ~]# ll /dev/infiniband/
total 0
crw-rw---- 1 root root 231,  64 Aug 16 10:41 issm0
crw-rw---- 1 root root 231,  65 Aug 16 10:41 issm1
crw-rw-rw- 1 root root  10,  56 Aug 16 10:41 rdma_cm
crw-rw-rw- 1 root root 231,   0 Aug 16 10:41 umad0
crw-rw-rw- 1 root root 231,   1 Aug 16 10:41 umad1
crw-rw-rw- 1 root root 231, 192 Aug 16 10:41 uverbs0


See the discussion at:
https://www.centos.org/modules/newbb/viewtopic.php?topic_id=38586

Can someone with access to TUV bug archive check if this has been fixed already?

Thanks,
Francesco.