From e9f45695c1bd8641dec6afa97aae6a52f0f66e8b Mon Sep 17 00:00:00 2001
From: Nikolaj Bjorner <nbjorner@microsoft.com>
Date: Sun, 22 Mar 2020 10:57:22 -0700
Subject: [PATCH] fix #3443 - some properties checked by invariant isn't valid
 during destructor when using threads

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
---
 src/sat/sat_solver.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sat/sat_solver.cpp b/src/sat/sat_solver.cpp
index d57d85ab0..bbb163fee 100644
--- a/src/sat/sat_solver.cpp
+++ b/src/sat/sat_solver.cpp
@@ -88,7 +88,7 @@ namespace sat {
 
     solver::~solver() {
         m_ext = nullptr;
-        SASSERT(check_invariant());
+        SASSERT(m_config.m_num_threads > 1 || check_invariant());
         TRACE("sat", tout << "Delete clauses\n";);
         del_clauses(m_clauses);
         TRACE("sat", tout << "Delete learned\n";);