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=-11.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 D2677C433E9 for ; Thu, 14 Jan 2021 14:26:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A0F01208C3 for ; Thu, 14 Jan 2021 14:26:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729187AbhANO0I (ORCPT ); Thu, 14 Jan 2021 09:26:08 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:30670 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729191AbhANO0H (ORCPT ); Thu, 14 Jan 2021 09:26:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1610634281; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=OWeXR5g8sFOaWy16++87vypsCr4n11fyoItyYOQT9J0=; b=D98oDpe0E0c+Mur2J1HxVK7PDHUXLh4endrMyzu9jsb5gli75oC5UYZBojFkxBS8OsiLDS NkeSGHfxK+nDaq4HTNoK/bHkStc2vDyVNJD+Pco97vJtoLfU0mI4XweA7NtmnJTBw57BG+ C8RZhmjzcHTqx0hXVhCOZvjkl3ALznc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-436-Fp7mhD9xPAS1IgVvhZ7uVg-1; Thu, 14 Jan 2021 09:24:37 -0500 X-MC-Unique: Fp7mhD9xPAS1IgVvhZ7uVg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0A71B9CC03; Thu, 14 Jan 2021 14:24:35 +0000 (UTC) Received: from krava (unknown [10.40.195.188]) by smtp.corp.redhat.com (Postfix) with SMTP id EB41260CED; Thu, 14 Jan 2021 14:24:31 +0000 (UTC) Date: Thu, 14 Jan 2021 15:24:31 +0100 From: Jiri Olsa To: Sedat Dilek Cc: Andrii Nakryiko , Jiri Olsa , Yonghong Song , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , John Fastabend , KP Singh , Masahiro Yamada , bpf , Linux Kbuild mailing list , Tom Stellard Subject: Re: Check pahole availibity and BPF support of toolchain before starting a Linux kernel build Message-ID: <20210114142431.GB1416940@krava> References: <20210111223144.GA1250730@krava> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Thu, Jan 14, 2021 at 03:13:18PM +0100, Sedat Dilek wrote: > On Mon, Jan 11, 2021 at 11:31 PM Jiri Olsa wrote: > > > > On Mon, Jan 11, 2021 at 10:30:22PM +0100, Sedat Dilek wrote: > > > > SNIP > > > > > > > > > > > > Building a new Linux-kernel... > > > > > > > > > > - Sedat - > > > > > > > > > > [1] https://git.kernel.org/pub/scm/devel/pahole/pahole.git/ > > > > > [2] https://github.com/ClangBuiltLinux/tc-build/issues/129#issuecomment-758026878 > > > > > [3] https://github.com/ClangBuiltLinux/tc-build/issues/129#issuecomment-758056553 > > > > > > > > There are no significant bug fixes between pahole 1.19 and master that > > > > would solve this problem, so let's try to repro this. > > > > > > > > > > You are right pahole fom latest Git does not solve the issue. > > > > > > + info BTFIDS vmlinux > > > + [ != silent_ ] > > > + printf %-7s %s\n BTFIDS vmlinux > > > BTFIDS vmlinux > > > + ./tools/bpf/resolve_btfids/resolve_btfids vmlinux > > > FAILED: load BTF from vmlinux: Invalid argument > > > > hm, is there a .BTF section in vmlinux? > > > > is this working over vmlinux: > > $ bpftool btf dump file ./vmlinux > > > > I switched to LLVM v12 from and saw the same FAILED line. > > The generated vmlinux file is cleaned on failure. > > + info BTFIDS vmlinux > + [ != silent_ ] > + printf %-7s %s\n BTFIDS vmlinux > BTFIDS vmlinux > + ./tools/bpf/resolve_btfids/resolve_btfids vmlinux > FAILED: load BTF from vmlinux: Invalid argument did pahole generated the .BTF section? earlier in the log jirka