From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2F65C433DB for ; Tue, 29 Dec 2020 23:29:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ABB3F22227 for ; Tue, 29 Dec 2020 23:29:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726302AbgL2X3Z (ORCPT ); Tue, 29 Dec 2020 18:29:25 -0500 Received: from foss.arm.com ([217.140.110.172]:50358 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726161AbgL2X3Y (ORCPT ); Tue, 29 Dec 2020 18:29:24 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C8C9030E; Tue, 29 Dec 2020 15:28:38 -0800 (PST) Received: from e107158-lin (e107158-lin.cambridge.arm.com [10.1.194.78]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id A99CB3F6CF; Tue, 29 Dec 2020 15:28:37 -0800 (PST) Date: Tue, 29 Dec 2020 23:28:35 +0000 From: Qais Yousef To: Jiri Olsa Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Jiri Olsa , netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: BTFIDS: FAILED unresolved symbol udp6_sock Message-ID: <20201229232835.cbyfmja3bu3lx7we@e107158-lin> References: <20201229151352.6hzmjvu3qh6p2qgg@e107158-lin> <20201229173401.GH450923@krava> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20201229173401.GH450923@krava> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jiri On 12/29/20 18:34, Jiri Olsa wrote: > On Tue, Dec 29, 2020 at 03:13:52PM +0000, Qais Yousef wrote: > > Hi > > > > When I enable CONFIG_DEBUG_INFO_BTF I get the following error in the BTFIDS > > stage > > > > FAILED unresolved symbol udp6_sock > > > > I cross compile for arm64. My .config is attached. > > > > I managed to reproduce the problem on v5.9 and v5.10. Plus 5.11-rc1. > > > > Have you seen this before? I couldn't find a specific report about this > > problem. > > > > Let me know if you need more info. > > hi, > this looks like symptom of the gcc DWARF bug we were > dealing with recently: > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97060 > https://lore.kernel.org/lkml/CAE1WUT75gu9G62Q9uAALGN6vLX=o7vZ9uhqtVWnbUV81DgmFPw@mail.gmail.com/#r > > what pahole/gcc version are you using? I'm on gcc 9.3.0 aarch64-linux-gnu-gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0 I was on pahole v1.17. I moved to v1.19 but I still see the same problem. Thanks -- Qais Yousef > > we fixed pahole (v1.19) to workaround the issue and AFAIK > there's already gcc fix as well