If you hit cancel before the page for sign in is fully loaded you get stuck seemingly forever waiting for g_io_stream_close (a blocking call).

+ Trace 232742

Getting libsoup to use the async version stops this from blocking.

diff --git a/libsoup/soup-socket.c b/libsoup/soup-socket.c
index baa9290..ddca801 100644
--- a/libsoup/soup-socket.c
+++ b/libsoup/soup-socket.c
@@ -114,7 +114,8 @@ disconnect_internal (SoupSocket *sock, gboolean close)
 
        g_clear_object (&priv->gsock);
        if (priv->conn && close)
-               g_io_stream_close (priv->conn, NULL, NULL);
+               g_io_stream_close_async (priv->conn, 0,
+                                         NULL, NULL, NULL);
 
        if (priv->read_src) {
                g_source_destroy (priv->read_src);