fix regression found by fuzzers fix #6271

Z3Prover · Aug 14, 2022 · 138f0d2 · 138f0d2
1 parent 1d87592
commit 138f0d2
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/src/qe/mbp/mbp_arith.cpp b/src/qe/mbp/mbp_arith.cpp
@@ -220,10 +220,13 @@ namespace mbp {
                 if (!a.is_numeral(val, r))
                     throw default_exception("mbp evaluation didn't produce an integer");
                 c += mul * r;
-                // t1 mod mul1 == r               
-                vars coeffs;
-                rational c0 = add_def(t1, mul1, coeffs);
-                mbo.add_divides(coeffs, c0 - r, mul1);
+
+               rational c0(-r), mul0(1);
+               obj_map<expr, rational> ts0;
+               linearize(mbo, eval, mul0, t1, c0, fmls, ts0, tids);
+               vars coeffs;
+               extract_coefficients(mbo, eval, ts0, tids, coeffs);
+               mbo.add_divides(coeffs, c0, mul1);
             }
             else if (false && a.is_mod(t, t1, t2) && is_numeral(t2, mul1) && mul1 > 0) {
                 // v = t1 mod mul1