Description of problem:
When glusterfs is build with efence, upon peer probe it crashes if the iptables are on. This is the backtrace of the core generated.

Program terminated with signal 11, Segmentation fault.
#0  0x00007f4288b22929 in glusterd_friend_remove_notify (peerinfo=0x7f4288adef10, req=0x7f42889ef540)
    at ../../../../../xlators/mgmt/glusterd/src/glusterd-handler.c:2687
2687                    glusterd_xfer_cli_probe_resp (req, -1, ENOTCONN,
Missing separate debuginfos, use: debuginfo-install ElectricFence-2.2.2-28.el6.x86_64 glibc-2.12-1.25.el6.x86_64 libgcc-4.4.5-6.el6.x86_64
(gdb) bt
#0  0x00007f4288b22929 in glusterd_friend_remove_notify (peerinfo=0x7f4288adef10, req=0x7f42889ef540)
    at ../../../../../xlators/mgmt/glusterd/src/glusterd-handler.c:2687
#1  0x00007f4288b22d11 in glusterd_peer_rpc_notify (rpc=0x7f4288773ee8, mydata=0x7f4288adcfe0, event=RPC_CLNT_DISCONNECT, data=0x0)
    at ../../../../../xlators/mgmt/glusterd/src/glusterd-handler.c:2773
#2  0x00007f428b97aa7d in rpc_clnt_notify (trans=0x7f428877dd40, mydata=0x7f4288773f18, event=RPC_TRANSPORT_DISCONNECT, data=0x7f428877dd40)
    at ../../../../rpc/rpc-lib/src/rpc-clnt.c:879
#3  0x00007f428b976d14 in rpc_transport_notify (this=0x7f428877dd40, event=RPC_TRANSPORT_DISCONNECT, data=0x7f428877dd40)
    at ../../../../rpc/rpc-lib/src/rpc-transport.c:498
#4  0x00007f42887e45a8 in socket_connect_finish (this=0x7f428877dd40) at ../../../../../rpc/rpc-transport/socket/src/socket.c:1750
#5  0x00007f42887e479b in socket_event_handler (fd=9, idx=2, data=0x7f428877dd40, poll_in=1, poll_out=0, poll_err=24)
    at ../../../../../rpc/rpc-transport/socket/src/socket.c:1782
#6  0x00007f428bbcdb54 in event_dispatch_epoll_handler (event_pool=0x7f428b48cf60, events=0x7f428b50c3ec, i=0)
    at ../../../libglusterfs/src/event.c:794
#7  0x00007f428bbcdd77 in event_dispatch_epoll (event_pool=0x7f428b48cf60) at ../../../libglusterfs/src/event.c:856
#8  0x00007f428bbce102 in event_dispatch (event_pool=0x7f428b48cf60) at ../../../libglusterfs/src/event.c:956
#9  0x0000000000407ace in main (argc=1, argv=0x7fff02e35478) at ../../../glusterfsd/src/glusterfsd.c:1601
(gdb) f 0
#0  0x00007f4288b22929 in glusterd_friend_remove_notify (peerinfo=0x7f4288adef10, req=0x7f42889ef540)
    at ../../../../../xlators/mgmt/glusterd/src/glusterd-handler.c:2687
2687                    glusterd_xfer_cli_probe_resp (req, -1, ENOTCONN,
(gdb) l
2682                                    "Unable to find the request for responding "
2683                                    "to User (%s)", peerinfo->hostname);
2684                            goto out;
2685                    }
2686
2687                    glusterd_xfer_cli_probe_resp (req, -1, ENOTCONN,
2688                                                  peerinfo->hostname, peerinfo->port);
2689            } else {
2690                    gf_log ("glusterd", GF_LOG_ERROR,
2691                            "Unable to create event for removing peer %s",
(gdb) p peerinfo
$1 = (glusterd_peerinfo_t *) 0x7f4288adef10
(gdb) p *peerinfo
$2 = {uuid = '\000' <repeats 15 times>, uuid_str = '\000' <repeats 49 times>, state = {state = GD_FRIEND_STATE_DEFAULT, transition_time = {
      tv_sec = 0, tv_usec = 0}}, hostname = 0x0, port = 0, uuid_list = {next = 0x0, prev = 0x0}, op_peers_list = {next = 0x0, prev = 0x0}, 
  rpc = 0x0, mgmt = 0x0, peer = 0x0, connected = 0, shandle = 0x0, sm_log = {transitions = 0x0, current = 0, size = 0, count = 0, 
    state_name_get = 0, event_name_get = 0}}
(gdb) p peerinfo->hostname
$3 = 0x0
(gdb) p peerinfo->port
$4 = 0
(gdb) f 1
#1  0x00007f4288b22d11 in glusterd_peer_rpc_notify (rpc=0x7f4288773ee8, mydata=0x7f4288adcfe0, event=RPC_CLNT_DISCONNECT, data=0x0)
    at ../../../../../xlators/mgmt/glusterd/src/glusterd-handler.c:2773
2773                            glusterd_friend_remove_notify (peerinfo,
(gdb) l glusterd_peer_rpc_notify
2698
2699    int
2700    glusterd_peer_rpc_notify (struct rpc_clnt *rpc, void *mydata,
2701                              rpc_clnt_event_t event,
2702                              void *data)
2703    {
2704            xlator_t             *this        = NULL;
2705            glusterd_conf_t      *conf        = NULL;
2706            int                   ret         = 0;
2707            glusterd_peerinfo_t  *peerinfo    = NULL;
(gdb) 
2708            glusterd_peerctx_t   *peerctx     = NULL;
2709            uuid_t                owner       = {0,};
2710            uuid_t               *peer_uuid   = NULL;
2711
2712            peerctx = mydata;
2713            if (!peerctx)
2714                    return 0;
2715
2716            peerinfo = peerctx->peerinfo;
2717            this = THIS;
(gdb) 
2718            conf = this->private;
2719
p peerctx
$5 = (glusterd_peerctx_t *) 0x7f4288adcfe0
(gdb) p *peerctx
$6 = {args = {req = 0x0, mode = GD_MODE_OFF}, peerinfo = 0x0}
(gdb) 




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