Mine

1220          if (self->priv->sink) {
(gdb) 
1221            GstElement *sink_parent = (GstElement *) gst_element_get_parent (self->priv->sink);
(gdb) p self->priv->sink
No symbol "self" in current context.
(gdb) p *((FarsightRTPStream *) ( ((DepayloaderChainInfo *) user_data)->stream))->priv->sink
$7 = {object = {object = {g_type_instance = {g_class = 0x0}, ref_count = 0, qdata = 0x0}, refcount = 0, lock = 0x80b7b50, name = 0x80eafd0 "RTP", 
    name_prefix = 0x0, parent = 0x0, flags = 34, _gst_reserved = 0x0}, state_lock = 0x0, state_cond = 0x0, state_cookie = 0, 
  current_state = GST_STATE_NULL, next_state = GST_STATE_VOID_PENDING, pending_state = GST_STATE_VOID_PENDING, last_return = GST_STATE_CHANGE_SUCCESS, 
  bus = 0x0, clock = 0x0, base_time = 0, numpads = 0, pads = 0x0, numsrcpads = 0, srcpads = 0x0, numsinkpads = 0, sinkpads = 0x0, pads_cookie = 2, 
  abidata = {ABI = {target_state = GST_STATE_NULL}, _gst_reserved = {0x1, 0x0, 0x0, 0x0}}}
(gdb) n

GStreamer-CRITICAL **: gst_object_get_parent: assertion `GST_IS_OBJECT (object)' failed
aborting...

Program received signal SIGABRT, Aborted.
0xffffe410 in __kernel_vsyscall ()