If rdma transport is destroyed because of any reason, then rdma.so will be unloaded. But we are not setting iobuf registeration function to null. After this, if an iobuf request is came, then we will try to call a function which is not loaded. Change-Id: I3293f9974e16d8e865131785ee697ea02be8cdfc BUG: 1187456 Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com> Reviewed-on: http://review.gluster.org/9697 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Raghavendra Talur <rtalur@redhat.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>