fix #4146

Author: NikolajBjorner

src/math/polynomial/polynomial.cpp

@@ -794,11 +794,15 @@ namespace polynomial {
         ~monomial_manager() {
             dec_ref(m_unit);
             CTRACE("polynomial", !m_monomials.empty(),
-                   tout << "monomials leaked\n";
+                   tout << "monomials leaked (can happen during cancelation)\n";
                    for (auto * m : m_monomials) {
                        m->display(tout << m->id() << " " << m->ref_count() << " ") << "\n";
                    });
-            SASSERT(m_monomials.empty());
+            for (monomial* m : m_monomials) {
+                unsigned obj_sz = monomial::get_obj_size(m->size());
+                m_allocator->deallocate(obj_sz, m);                
+            }
+            m_monomials.reset();
             if (m_own_allocator)
                 dealloc(m_allocator);
         }