Merge #18615: test: Avoid accessing free'd memory in validation_chainstatemanager_tests

fa176e253f test: Avoid accessing free'd memory in validation_chainstatemanager_tests (MarcoFalke)

Pull request description:

ACKs for top commit:
  ryanofsky:
    Code review ACK fa176e253f, though if you have to update this again, would suggest separating txindex test cleanup and the chainstatemanager test fix in separate commits, or identifying which part of the change is the bugfix fix in the commit description. Also to clean up the txindex test it might make sense to call SyncWithValidationInterfaceQueue in the test destructor to prevent nondeterminism in other tests

Tree-SHA512: 34c5dca283a7c205cd42b6aa59f00a71fd1bd980bc3d6640a18b280be11470bfabb2fd8c93fadde6fb8e084bcf96c80ec3aa72bbccccfde8a8260d173eaad08f

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());
 }