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=-7.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 3F4E5C433E0 for ; Tue, 9 Feb 2021 04:47:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EFDD064E76 for ; Tue, 9 Feb 2021 04:47:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229753AbhBIEqg (ORCPT ); Mon, 8 Feb 2021 23:46:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229671AbhBIEqf (ORCPT ); Mon, 8 Feb 2021 23:46:35 -0500 Received: from mail-yb1-xb33.google.com (mail-yb1-xb33.google.com [IPv6:2607:f8b0:4864:20::b33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30823C061786; Mon, 8 Feb 2021 20:45:55 -0800 (PST) Received: by mail-yb1-xb33.google.com with SMTP id 133so4237616ybd.5; Mon, 08 Feb 2021 20:45:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=A6BzBFq/h4O9r6Thlrxst/c/U1T17VZ5hS40vkBwc/Y=; b=LcJXMO8xiunbWqATrRgeIHzUFG5/EcP+UslcOUQh0ruyQzNobdHYE8XsmNeaLNV5h/ O10U7u4vbMLUlmBgMcZJ8k9zGXpEclEdGE60tOBcE2berd3Mrk+1NSkaU/63z3YjYRTW x8xVpPI5c0flvl18gFaPFOglMOgAla9oN9fHnRaGnTn77+yyVEqhSG6TngS3sMx/+0qi 5tytQtOd4WMkm+C0QDBdQtngg2RYjf4+ma85PCKq0DADGiGpp0RbVte1uJcmhec3zWCC hG6Snv//degpWwmlEKLkvdQ9kqxWEAQ1QcEPix7Pj0tBkKeaoXzFfW8Q+lQ5ldIne2PF QSgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=A6BzBFq/h4O9r6Thlrxst/c/U1T17VZ5hS40vkBwc/Y=; b=CWhpaCaAjdMl1XEr4EgvIcxkhYA49XSAI8TRDGAfIKnq7V59mdd9JUI10aeSyIb5PP QuShWQpdWm8W+na0oNpKfbDr9129t5M6iVIrgLi5vu8qDh0Pm7xh2vNU4RG5u3xuW07p Nl39G5PvYDlaV3GmgH6J0A9UD7w1P1DnIaYAxphE5zsKzwLp3v+A9mVwOgyH6/z63kjT zvuBahCbF9iH7eDfUdyx6aMOK4xyDgLI7tLgtsUnqm+rwgN7ifCKfhFiVyiWUTu+1X0j ZH5/ZJnuP4QV+pwPKu1oxeMVTLJe4ZC2zZkE6E6t8zmSEjyaAkvoCDnToq7D1lVxkhzs dzwg== X-Gm-Message-State: AOAM532q509r8k7rU6QlEHKfzjcudaolHvFzAz3aNCt9jq/xFyobwSQJ KAIQ1fh6etlCc27qJ4cRGmKfUEYYad7/yNiQIRE= X-Google-Smtp-Source: ABdhPJwTHmlPJ5odFMU0zR5R39M/5rFywQYPwloIZVJAlmgnpe/XCEu0LEPh9FoS8LNa9b514A7GzdYx3OW257PZAbU= X-Received: by 2002:a25:a183:: with SMTP id a3mr29427620ybi.459.1612845954258; Mon, 08 Feb 2021 20:45:54 -0800 (PST) MIME-Version: 1.0 References: <20210209034416.GA1669105@ubuntu-m3-large-x86> In-Reply-To: <20210209034416.GA1669105@ubuntu-m3-large-x86> From: Andrii Nakryiko Date: Mon, 8 Feb 2021 20:45:43 -0800 Message-ID: Subject: Re: FAILED unresolved symbol vfs_truncate on arm64 with LLVM To: Nathan Chancellor Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Nick Desaulniers , Networking , bpf , clang-built-linux , Veronika Kabatova , Jiri Olsa Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Mon, Feb 8, 2021 at 7:44 PM Nathan Chancellor wrote: > > Hi all, > > Recently, an issue with CONFIG_DEBUG_INFO_BTF was reported for arm64: > https://groups.google.com/g/clang-built-linux/c/de_mNh23FOc/m/E7cu5BwbBAAJ > > $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \ > LLVM=1 O=build/aarch64 defconfig > > $ scripts/config \ > --file build/aarch64/.config \ > -e BPF_SYSCALL \ > -e DEBUG_INFO_BTF \ > -e FTRACE \ > -e FUNCTION_TRACER > > $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \ > LLVM=1 O=build/aarch64 olddefconfig all > ... > FAILED unresolved symbol vfs_truncate > ... > > My bisect landed on commit 6e22ab9da793 ("bpf: Add d_path helper") > although that seems obvious given that is what introduced > BTF_ID(func, vfs_truncate). > > I am using the latest pahole v1.20 and LLVM is at > https://github.com/llvm/llvm-project/commit/14da287e18846ea86e45b421dc47f78ecc5aa7cb > although I can reproduce back to LLVM 10.0.1, which is the earliest > version that the kernel supports. I am very unfamiliar with BPF so I > have no idea what is going wrong here. Is this a known issue? > I'll skip the reproduction games this time and will just request the vmlinux image. Please upload somewhere so that we can look at DWARF and see what's going on. Thanks. > Cheers, > Nathan