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=unavailable 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 8E4EAC433DB for ; Tue, 12 Jan 2021 10:48:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5224923109 for ; Tue, 12 Jan 2021 10:48:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727989AbhALKr7 (ORCPT ); Tue, 12 Jan 2021 05:47:59 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:55681 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726673AbhALKr7 (ORCPT ); Tue, 12 Jan 2021 05:47:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1610448392; 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=6UGpP/GOG7p8YqbEduT5rHYPzzcPgvWMqUPnCJMZHE4=; b=AoMaaqefN9VGoU/HuJjntZDRh1rqCJchafms+byG9GaBW2jcfddyHrkCV9x2UGbqPt2YNj wMw1yu8qwKZp8ZiAlOTuRDn1E3/EOfGopHh1ykVz41GnV6CgtsYy4Xuh85wgQWiU5OviJi +uYVw1fNJwJ1arZr4acZqxj7jtiOTHs= 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-269-JXjMLP_CMCGn8tqskUz6yA-1; Tue, 12 Jan 2021 05:46:29 -0500 X-MC-Unique: JXjMLP_CMCGn8tqskUz6yA-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 A602E801B14; Tue, 12 Jan 2021 10:46:26 +0000 (UTC) Received: from krava (unknown [10.40.195.50]) by smtp.corp.redhat.com (Postfix) with SMTP id 4B7BC77BE1; Tue, 12 Jan 2021 10:46:23 +0000 (UTC) Date: Tue, 12 Jan 2021 11:46:22 +0100 From: Jiri Olsa To: Tom Stellard Cc: Sedat Dilek , 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 Subject: Re: Check pahole availibity and BPF support of toolchain before starting a Linux kernel build Message-ID: <20210112104622.GA1283572@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 Mon, Jan 11, 2021 at 02:34:04PM -0800, Tom Stellard wrote: > On 1/11/21 2:31 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 > > > > do you have a verbose build output? I'd think pahole scream first.. > > > > It does. For me, pahole segfaults at scripts/link-vmlinux.sh:131. This is > pretty easy for me to reproduce. I have logs, what other information would > be helpful? How about a pahole backtrace? that'd be great.. I'll try to reproduce, but with the latest clang it will take me some time jirka > > -Tom > > > jirka > > >