On Mon, Nov 27, 2017 at 08:27:55PM +0800, Greentime Hu wrote: > +#define start_thread(regs,pc,stack) \ > +({ \ > + set_fs(USER_DS); \ Not the job of start_thread() - its users (->load_binary() methods of assorted binfmt) must (and do) call flush_old_exec() first. And that will switch to USER_DS just fine. -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html