Description of problem:
glusterd when built with efence (efence helps in identifying memory corruptions), crashes upon receiving volume stop command with below backtrace.

(gdb) bt
#0  0x00007f51e8e07213 in glusterd_op_ac_rcvd_brick_op_acc (event=0x7f51e6597fd0, ctx=0x7f51e6591fd0) at glusterd-op-sm.c:2865
#1  0x00007f51e8e07851 in glusterd_op_sm () at glusterd-op-sm.c:3321
#2  0x00007f51e8e1b857 in glusterd3_1_brick_op_cbk (req=0x7f51e6a6300c, iov=0x7f51e6a6304c, count=1, myframe=0x7f51ea17909c)
    at glusterd-rpc-ops.c:1687
#3  0x00007f51eb859a8f in rpc_clnt_handle_reply (clnt=0x7f51e6cb8ee0, pollin=0x7f51e655bfb0) at rpc-clnt.c:789
#4  0x00007f51eb859df0 in rpc_clnt_notify (trans=0x7f51e6d40d40, mydata=0x7f51e6cb8f10, event=RPC_TRANSPORT_MSG_RECEIVED,
    data=0x7f51e655bfb0) at rpc-clnt.c:908
#5  0x00007f51eb855e79 in rpc_transport_notify (this=0x7f51e6d40d40, event=RPC_TRANSPORT_MSG_RECEIVED, data=0x7f51e655bfb0)
    at rpc-transport.c:498
#6  0x00007f51e8abe151 in socket_event_poll_in (this=0x7f51e6d40d40) at socket.c:1675
#7  0x00007f51e8abe6bf in socket_event_handler (fd=13, idx=5, data=0x7f51e6d40d40, poll_in=1, poll_out=0, poll_err=0) at socket.c:1790
#8  0x00007f51ebaac1d6 in event_dispatch_epoll_handler (event_pool=0x7f51eb360f60, events=0x7f51eb3e0390, i=1) at event.c:794
#9  0x00007f51ebaac3e9 in event_dispatch_epoll (event_pool=0x7f51eb360f60) at event.c:856
#10 0x00007f51ebaac75c in event_dispatch (event_pool=0x7f51eb360f60) at event.c:956
#11 0x0000000000407ab7 in main (argc=1, argv=0x7fff58ad9448) at glusterfsd.c:1601

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