In gnome-games I encountered really annoying crashes coming from get_url_cb from the grl-net-wc.c file.

In this code:
>   /* validation */
>   {
>     GrlNetWcPrivate *priv = c->self->priv;
>     struct request_clos *d = g_queue_pop_tail (priv->pending);
>     g_assert (c == d);
>   }

Sometimes the assertion fails indeed sometimes the get_url_cb function is called with a request_clos located later in the list of pending requests.

I suspsect this is caused by callbacks being called sometimes on idle and sometimes on a timeout: if an 'idle' callback is added after a 'timeout' one it may be triggered first, breaking the order.

I'm not sure how to fix this properly though. :) Extracting the correct request from the pending requests queue rather than the first one and asserting that the extraction worked may be a solution.