On Mon, Aug 14, 2023 at 09:41:46PM +0800, Leon Hwang wrote: > @@ -1147,6 +1152,7 @@ struct bpf_attach_target_info { > struct module *tgt_mod; > const char *tgt_name; > const struct btf_type *tgt_type; > + bool tail_call_ctx; Instead of extra flag here can you check tgt_prog->aux->tail_call_reachable in check_attach_btf_id() and set tr->flags there? Other than this the fix makes sense. Please trim your cc list when you respin. Just maintainers, Maciej (author of fixes tag) and bpf@vger is enough.