Index: sage/rings/polynomial/multi_polynomial_libsingular.pyx
===================================================================
--- sage/rings/polynomial/multi_polynomial_libsingular.pyx	(revision 7380)
+++ sage/rings/polynomial/multi_polynomial_libsingular.pyx	(revision 7403)
@@ -3009,5 +3009,7 @@
         ptemp = p_Copy(self._poly,_ring)
         iv = NULL
+        _sig_on
         I = singclap_factorize ( ptemp, &iv , int(param)) #delete iv at some point
+        _sig_off
 
         if param==1: