diff --git a/externals/wamr/CMakeLists.txt b/externals/wamr/CMakeLists.txt
index a4f1a1a7..9e82f1fc 100644
--- a/externals/wamr/CMakeLists.txt
+++ b/externals/wamr/CMakeLists.txt
@@ -28,7 +28,7 @@ set(WAMR_BUILD_LIB_WASI_THREADS 0)
 set(WAMR_BUILD_MINI_LOADER 0)
 set(WAMR_BUILD_MODULE_INST_CONTEXT 0)
 set(WAMR_BUILD_MULTI_MODULE 0)
-set(WAMR_BUILD_REF_TYPES 0)
+set(WAMR_BUILD_REF_TYPES 1)
 set(WAMR_BUILD_SHARED_MEMORY 0)
 set(WAMR_BUILD_SIMD 1)
 set(WAMR_BUILD_TAIL_CALL 1)
diff --git a/sources/libcore/wasm.cpp b/sources/libcore/wasm.cpp
index fc6f80e8..0c71264c 100644
--- a/sources/libcore/wasm.cpp
+++ b/sources/libcore/wasm.cpp
@@ -27,10 +27,11 @@ extern "C"
 
 	void cage_wamr_log(uint32 log_level, const char *file, int line, const char *format, ...)
 	{
+		String str;
 		std::va_list va;
 		va_start(va, format);
-		String str;
 		std::vsnprintf(str.rawData(), str.MaxLength - 100, format, va);
+		va_end(va);
 		str.rawLength() = std::strlen(str.rawData());
 		str = trim(str);
 		SeverityEnum sev = SeverityEnum::Info;
@@ -256,6 +257,15 @@ namespace cage
 				data.resize(std::max(sz, countOfWasmVal(returns)));
 			}
 		};
+
+		template<uint32 A>
+		void strCopyTruncate(detail::StringBase<A> &dst, const char *src)
+		{
+			uint32 len = std::strlen(src);
+			if (len > A)
+				len = A;
+			dst = detail::StringBase<A>(PointerRange<const char>(src, src + len));
+		}
 	}
 
 	namespace privat
@@ -332,7 +342,7 @@ namespace cage
 			wasm_runtime_get_import_type(impl->module, i, &t);
 			WasmSymbol w;
 			w.moduleName = t.module_name;
-			w.name = t.name;
+			strCopyTruncate(w.name, t.name);
 			w.kind = toString(t.kind);
 			w.linked = t.linked;
 			arr.push_back(w);
@@ -351,7 +361,7 @@ namespace cage
 			wasm_export_t t = {};
 			wasm_runtime_get_export_type(impl->module, i, &t);
 			WasmSymbol w;
-			w.name = t.name;
+			strCopyTruncate(w.name, t.name);
 			w.kind = toString(t.kind);
 			w.linked = true;
 			arr.push_back(w);
diff --git a/sources/test-core/wasm.cpp b/sources/test-core/wasm.cpp
index aa39fa53..405a14c3 100644
--- a/sources/test-core/wasm.cpp
+++ b/sources/test-core/wasm.cpp
@@ -7,6 +7,7 @@
 PointerRange<const uint8> sums_wasm();
 PointerRange<const uint8> strings_wasm();
 PointerRange<const uint8> natives_wasm();
+PointerRange<const uint8> foo_wasm();
 
 namespace
 {
@@ -149,6 +150,30 @@ void testWasm()
 		}
 	}
 
+	{
+		CAGE_TESTCASE("foo (c++ objects lifetime)");
+		Holder<WasmModule> mod = newWasmModule(foo_wasm().cast<const char>());
+		printModuleDetails(+mod);
+		Holder<WasmInstance> inst = wasmInstantiate(mod.share());
+		WasmFunction get_foo = inst->function<sint32()>("get_foo");
+		WasmFunction set_foo = inst->function<void(sint32)>("set_foo");
+		WasmFunction get_map = inst->function<sint32(sint32)>("get_map");
+		WasmFunction set_map = inst->function<void(sint32, sint32)>("set_map");
+		CAGE_TEST(get_foo() == 2);
+		set_foo(123);
+		CAGE_TEST(get_foo() == 123);
+		CAGE_TEST(get_map(10) == 2); // previously non-existent key
+		set_map(10, 100);
+		WasmBuffer tmp = inst->allocate(12'000);
+		set_map(20, 400);
+		CAGE_TEST(get_map(10) == 100);
+		CAGE_TEST(get_map(20) == 400);
+		set_map(30, 900);
+		CAGE_TEST(get_map(10) == 100);
+		CAGE_TEST(get_map(20) == 400);
+		CAGE_TEST(get_map(30) == 900);
+	}
+
 	{
 		CAGE_TESTCASE("multiple instantiations of same module");
 		Holder<WasmModule> mod = newWasmModule(strings_wasm().cast<const char>());
diff --git a/sources/test-core/wasm/compile.sh b/sources/test-core/wasm/compile.sh
index 5af6da7d..49e7f477 100644
--- a/sources/test-core/wasm/compile.sh
+++ b/sources/test-core/wasm/compile.sh
@@ -3,3 +3,5 @@ PATH="$PATH:/c/Program Files/LLVM/bin"
 clang --target=wasm32 -Wl,--export-all -Wl,--no-entry -nostdlib -o sums.wasm sums.c
 clang --target=wasm32 -Wl,--allow-undefined -Wl,--export-all -Wl,--no-entry -nostdlib -o strings.wasm strings.c
 clang --target=wasm32 -Wl,--allow-undefined -Wl,--export-all -Wl,--no-entry -nostdlib -o natives.wasm natives.c
+#clang++ --target=wasm32 -Wl,--allow-undefined -Wl,--export-all -Wl,--no-entry -nostdlib -nostartfiles -o foo.wasm foo.cpp
+em++ --target=wasm32 -Wl,--allow-undefined -Wl,--export-all -Wl,--no-entry -nostartfiles -O2 -o foo.wasm foo.cpp
diff --git a/sources/test-core/wasm/foo.cpp b/sources/test-core/wasm/foo.cpp
new file mode 100644
index 00000000..f8a30a7b
--- /dev/null
+++ b/sources/test-core/wasm/foo.cpp
@@ -0,0 +1,38 @@
+#include <map>
+
+struct Foo
+{
+	int data = 1;
+	Foo() { data = 2; }
+	~Foo() { data = 3; }
+};
+
+Foo foo;
+
+extern "C"
+{
+	int get_foo(void)
+	{
+		return foo.data;
+	}
+
+	void set_foo(int v)
+	{
+		foo.data = v;
+	}
+} // extern C
+
+std::map<int, Foo> map;
+
+extern "C"
+{
+	int get_map(int key)
+	{
+		return map[key].data;
+	}
+
+	void set_map(int key, int val)
+	{
+		map[key].data = val;
+	}
+} // extern C
diff --git a/sources/test-core/wasm/foo.wasm b/sources/test-core/wasm/foo.wasm
new file mode 100644
index 00000000..921c8402
Binary files /dev/null and b/sources/test-core/wasm/foo.wasm differ