LevelDB leak repro

src/Makefile.test.include

@@ -286,6 +286,7 @@ test_fuzz_fuzz_SOURCES = \
  test/fuzz/key.cpp \
  test/fuzz/key_io.cpp \
  test/fuzz/kitchen_sink.cpp \
+ test/fuzz/leveldb_leak.cpp \
  test/fuzz/load_external_block_file.cpp \
  test/fuzz/locale.cpp \
  test/fuzz/merkleblock.cpp \

src/test/fuzz/leveldb_leak.cpp

@@ -0,0 +1,24 @@
+// Copyright (c) 2023 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <chainparams.h>
+#include <node/blockstorage.h>
+#include <test/fuzz/FuzzedDataProvider.h>
+#include <test/fuzz/fuzz.h>
+#include <test/fuzz/util.h>
+#include <util/thread.h>
+
+void init_leak()
+{
+    SelectParams(ChainType::MAIN);
+}
+
+FUZZ_TARGET(leak_test, .init = init_leak)
+{
+    kernel::BlockTreeDB block_tree{DBParams{
+        .path = "", // Memory-only.
+        .cache_bytes = 0,
+        .memory_only = true,
+    }};
+}