test: Avoid accessing free'd memory in validation_chainstatemanager_t…

…ests

src/test/txindex_tests.cpp

@@ -70,12 +70,8 @@ BOOST_FIXTURE_TEST_CASE(txindex_initial_sync, TestChain100Setup)
     // shutdown sequence (c.f. Shutdown() in init.cpp)
     txindex.Stop();
 
-    // txindex job may be scheduled, so stop scheduler before destructing
-    m_node.scheduler->stop();
-    threadGroup.interrupt_all();
-    threadGroup.join_all();
-
-    // Rest of shutdown sequence and destructors happen in ~TestingSetup()
+    // Let scheduler events finish running to avoid accessing any memory related to txindex after it is destructed
+    SyncWithValidationInterfaceQueue();
 }
 
 BOOST_AUTO_TEST_SUITE_END()

src/test/validation_chainstatemanager_tests.cpp

@@ -3,12 +3,13 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 //
 #include <chainparams.h>
-#include <random.h>
-#include <uint256.h>
 #include <consensus/validation.h>
+#include <random.h>
 #include <sync.h>
 #include <test/util/setup_common.h>
+#include <uint256.h>
 #include <validation.h>
+#include <validationinterface.h>
 
 #include <vector>
 
@@ -97,7 +98,9 @@ BOOST_AUTO_TEST_CASE(chainstatemanager)
     exp_tip = c1.m_chain.Tip();
     BOOST_CHECK_EQUAL(validated_tip, exp_tip);
 
-    // Avoid triggering the address sanitizer.
+    // Let scheduler events finish running to avoid accessing memory that is going to be unloaded
+    SyncWithValidationInterfaceQueue();
+
     WITH_LOCK(::cs_main, manager.Unload());
 }