diff --git a/core/iwasm/aot/aot_runtime.c b/core/iwasm/aot/aot_runtime.c
index 0c94ef7c0..6ab104905 100644
--- a/core/iwasm/aot/aot_runtime.c
+++ b/core/iwasm/aot/aot_runtime.c
@@ -901,6 +901,19 @@ create_exports(AOTModuleInstance *module_inst, AOTModule *module,
     return create_export_funcs(module_inst, module, error_buf, error_buf_size);
 }
 
+#if WASM_ENABLE_LIBC_WASI != 0
+static bool
+execute_initialize_function(AOTModuleInstance *module_inst)
+{
+    AOTFunctionInstance *initialize =
+        aot_lookup_function(module_inst, "_initialize", NULL);
+
+    return !initialize
+           || aot_create_exec_env_and_call_function(module_inst, initialize, 0,
+                                                    NULL);
+}
+#endif
+
 static bool
 execute_post_inst_function(AOTModuleInstance *module_inst)
 {
@@ -1121,11 +1134,27 @@ aot_instantiate(AOTModule *module, bool is_sub_inst, uint32 stack_size,
     }
 #endif
 
-    /* Execute __post_instantiate function and start function*/
-    if (!execute_post_inst_function(module_inst)
-        || !execute_start_function(module_inst)) {
-        set_error_buf(error_buf, error_buf_size, module_inst->cur_exception);
-        goto fail;
+    if (!is_sub_inst) {
+        if (
+#if WASM_ENABLE_LIBC_WASI != 0
+            /*
+             * reactor instances may assume that _initialize will be called by
+             * the environment at most once, and that none of their other
+             * exports are accessed before that call.
+             *
+             * let the loader decide how to act if there is no _initialize
+             * in a reactor
+             */
+            !execute_initialize_function(module_inst) ||
+#endif
+            /* Execute __post_instantiate function */
+            !execute_post_inst_function(module_inst)
+            /* Execute the function in "start" section */
+            || !execute_start_function(module_inst)) {
+            set_error_buf(error_buf, error_buf_size,
+                          module_inst->cur_exception);
+            goto fail;
+        }
     }
 
 #if WASM_ENABLE_BULK_MEMORY != 0
diff --git a/core/iwasm/interpreter/wasm_interp_classic.c b/core/iwasm/interpreter/wasm_interp_classic.c
index d8985713c..7b193f63c 100644
--- a/core/iwasm/interpreter/wasm_interp_classic.c
+++ b/core/iwasm/interpreter/wasm_interp_classic.c
@@ -1367,7 +1367,7 @@ wasm_interp_call_func_bytecode(WASMModuleInstance *module,
 
             HANDLE_OP(EXT_OP_BR_TABLE_CACHE)
             {
-                BrTableCache *node =
+                BrTableCache *node_cache =
                     bh_list_first_elem(module->module->br_table_cache_list);
                 BrTableCache *node_next;
 
@@ -1376,13 +1376,13 @@ wasm_interp_call_func_bytecode(WASMModuleInstance *module,
 #endif
                 lidx = POP_I32();
 
-                while (node) {
-                    node_next = bh_list_elem_next(node);
-                    if (node->br_table_op_addr == frame_ip - 1) {
-                        depth = node->br_depths[lidx];
+                while (node_cache) {
+                    node_next = bh_list_elem_next(node_cache);
+                    if (node_cache->br_table_op_addr == frame_ip - 1) {
+                        depth = node_cache->br_depths[lidx];
                         goto label_pop_csp_n;
                     }
-                    node = node_next;
+                    node_cache = node_next;
                 }
                 bh_assert(0);
                 HANDLE_OP_END();
diff --git a/core/iwasm/interpreter/wasm_runtime.c b/core/iwasm/interpreter/wasm_runtime.c
index 31b0d1ff4..1a37aacb3 100644
--- a/core/iwasm/interpreter/wasm_runtime.c
+++ b/core/iwasm/interpreter/wasm_runtime.c
@@ -1999,24 +1999,27 @@ wasm_instantiate(WASMModule *module, bool is_sub_inst, uint32 stack_size,
                 &module_inst->e->functions[module->start_function];
     }
 
-    if (
+    if (!is_sub_inst) {
+        if (
 #if WASM_ENABLE_LIBC_WASI != 0
-        /*
-         * reactor instances may assume that _initialize will be called by
-         * the environment at most once, and that none of their other
-         * exports are accessed before that call.
-         *
-         * let the loader decide how to act if there is no _initialize
-         * in a reactor
-         */
-        !execute_initialize_function(module_inst) ||
+            /*
+             * reactor instances may assume that _initialize will be called by
+             * the environment at most once, and that none of their other
+             * exports are accessed before that call.
+             *
+             * let the loader decide how to act if there is no _initialize
+             * in a reactor
+             */
+            !execute_initialize_function(module_inst) ||
 #endif
-        /* Execute __post_instantiate function */
-        !execute_post_inst_function(module_inst)
-        /* Execute the function in "start" section */
-        || !execute_start_function(module_inst)) {
-        set_error_buf(error_buf, error_buf_size, module_inst->cur_exception);
-        goto fail;
+            /* Execute __post_instantiate function */
+            !execute_post_inst_function(module_inst)
+            /* Execute the function in "start" section */
+            || !execute_start_function(module_inst)) {
+            set_error_buf(error_buf, error_buf_size,
+                          module_inst->cur_exception);
+            goto fail;
+        }
     }
 
 #if WASM_ENABLE_BULK_MEMORY != 0