Index: /trunk/src/VBox/Devices/Network/slirp/socket.c
===================================================================
--- /trunk/src/VBox/Devices/Network/slirp/socket.c	(revision 41805)
+++ /trunk/src/VBox/Devices/Network/slirp/socket.c	(revision 41806)
@@ -192,4 +192,8 @@
         return;
     }
+    /**
+     * Check that we don't freeng socket with tcbcb
+     */
+    Assert(!sototcpcb(so));
     if (so == tcp_last_so)
         tcp_last_so = &tcb;