diff -up lua-5.3.4/src/ldebug.c.bug4 lua-5.3.4/src/ldebug.c
--- lua-5.3.4/src/ldebug.c.bug4 2017-08-02 16:05:36.985671687 -0400
+++ lua-5.3.4/src/ldebug.c 2017-08-02 16:05:55.257256062 -0400
@@ -653,6 +653,7 @@ l_noret luaG_runerror (lua_State *L, con
CallInfo *ci = L->ci;
const char *msg;
va_list argp;
+ luaC_checkGC(L); /* error message uses memory */
va_start(argp, fmt);
msg = luaO_pushvfstring(L, fmt, argp); /* format message */
va_end(argp);