diff --git a/lualib-src/lua-sharedata.c b/lualib-src/lua-sharedata.c
index 6ef10f0a..e7a27c57 100644
--- a/lualib-src/lua-sharedata.c
+++ b/lualib-src/lua-sharedata.c
@@ -376,6 +376,7 @@ pconv(lua_State *L) {
 static void
 convert_stringmap(struct context *ctx, struct table *tbl) {
 	lua_State *L = ctx->L;
+	lua_checkstack(L, ctx->string_index + LUA_MINSTACK);
 	lua_settop(L, ctx->string_index + 1);
 	lua_pushvalue(L, 1);
 	struct state * s = lua_newuserdata(L, sizeof(*s));
diff --git a/service-src/service_snlua.c b/service-src/service_snlua.c
index 89e607f6..b839b117 100644
--- a/service-src/service_snlua.c
+++ b/service-src/service_snlua.c
@@ -12,6 +12,7 @@
 struct snlua {
 	lua_State * L;
 	struct skynet_context * ctx;
+	FILE *f;
 };
 
 // LUA_CACHELIB may defined in patched lua for shared proto
@@ -143,17 +144,35 @@ snlua_init(struct snlua *l, struct skynet_context *ctx, const char * args) {
 	return 0;
 }
 
+static void * 
+lalloc(void *ud, void *ptr, size_t osize, size_t nsize) {
+	struct snlua * l = ud;
+	if (l->f) {
+		fprintf(l->f, "%p %d %d\n", ptr, (int)osize, (int)nsize);
+	}
+	if (nsize == 0) {
+		skynet_free(ptr);
+		return NULL;
+	} else {
+		return skynet_realloc(ptr, nsize);
+	}
+}
+
 struct snlua *
 snlua_create(void) {
 	struct snlua * l = skynet_malloc(sizeof(*l));
 	memset(l,0,sizeof(*l));
-	l->L = lua_newstate(skynet_lalloc, NULL);
+	char tmp[L_tmpnam];
+	l->f = fopen(tmpnam(tmp),"wb");
+//	printf("%s\n", tmp);
+	l->L = lua_newstate(lalloc, l);
 	return l;
 }
 
 void
 snlua_release(struct snlua *l) {
 	lua_close(l->L);
+	fclose(l->f);
 	skynet_free(l);
 }
 
diff --git a/skynet-src/malloc_hook.c b/skynet-src/malloc_hook.c
index d9ad6f32..3cff09fa 100644
--- a/skynet-src/malloc_hook.c
+++ b/skynet-src/malloc_hook.c
@@ -218,6 +218,7 @@ skynet_strdup(const char *str) {
 
 void * 
 skynet_lalloc(void *ud, void *ptr, size_t osize, size_t nsize) {
+	printf("%p osize = %d nsize = %d\n", ptr, (int)osize, (int)nsize);
 	if (nsize == 0) {
 		skynet_free(ptr);
 		return NULL;