I met a strange problem: after dispose g_object_ref could also succeed!

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I met a strange problem: after dispose ( or during dispose) g_object_ref could also succeed! http://pastebin.com/d631246a7

It crashes on line 24, which is almost impossible. 

1st, I checked these variables.
2nd, I called g_object_ref(self) to avoid self being disposed while this function has not returned.

The only explanation is that : after dispose is called but before finalize is called, g_object_ref still could succeed!

Is that true?

  1. static gboolean vivs_net_inspiration_on_recv(GIOChannel *source, GIOCondition condition, gpointer data)
  2. {
  3.     VivsNetInspiration* self = VIVS_NET_INSPIRATION(data);
  4.  
  5.     if(!g_object_ref(self))
  6.         return FALSE;
  7.    
  8.     g_mutex_lock(self->priv->lock);
  9.  
  10.     gsize   length = 0;
  11.     GError* err = NULL;
  12.  
  13.     if(self->priv->channel && self->priv->composition)
  14.     {
  15.         GIOStatus status =  g_io_channel_read_chars(self->priv->channel,
  16.                     self->priv->pkt_buffer, MAX_PKT_LEN, &length, &err);
  17.         if(G_IO_STATUS_NORMAL == status)
  18.         {
  19.             // ???????????   the following line crash because self->priv->composition is NULL
  20.             // at this moment, which is almost impossible.
  21.             // composition could only be null after dispose, but I have called g_object_ref(self)
  22.              // How can this happen!!
  23.  
  24.             vivs_icomposition_write(self->priv->composition, self->priv->pkt_buffer, length);
  25.         }
  26.         else if(G_IO_STATUS_AGAIN != status)
  27.         {
  28.             g_assert(err != NULL);
  29.             g_error_free(err);
  30.         }
  31.     }
  32.  
  33. on_return:
  34.     g_mutex_unlock(self->priv->lock);
  35.  
  36.     g_object_unref(self);
  37.     return TRUE;
  38. }


--
look to the things around you,the immediate world around you, if you are alive,it will mean something to you ——Paul Strand
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