Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Tue, 18 Aug 2020 18:33:18 +0200
From:   Jesper Dangaard Brouer <brouer@redhat.com>
To:     Jiri Olsa <jolsa@redhat.com>
Cc:     brouer@redhat.com,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>, sdf@google.com,
        andriin@fb.com, Mark Wielaard <mjw@redhat.com>
Subject: Re: Kernel build error on BTFIDS vmlinux
Message-ID: <20200818183318.2c3fe4a2@carbon>
In-Reply-To: <20200818134543.GD177896@krava>
References: <20200818105555.51fc6d62@carbon>
        <20200818091404.GB177896@krava>
        <20200818105602.GC177896@krava>
        <20200818134543.GD177896@krava>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Tue, 18 Aug 2020 15:45:43 +0200
Jiri Olsa <jolsa@redhat.com> wrote:

> On Tue, Aug 18, 2020 at 12:56:08PM +0200, Jiri Olsa wrote:
> > On Tue, Aug 18, 2020 at 11:14:10AM +0200, Jiri Olsa wrote:  
> > > On Tue, Aug 18, 2020 at 10:55:55AM +0200, Jesper Dangaard Brouer wrote:  
> > > > 
> > > > On latest DaveM net-git tree (06a4ec1d9dc652), after linking (LD vmlinux) the
> > > > "BTFIDS vmlinux" fails. Are anybody else experiencing this? Are there already a
> > > > fix? (just returned from vacation so not fully up-to-date on ML yet)
> > > > 
> > > > The tool which is called and error message:
> > > >   ./tools/bpf/resolve_btfids/resolve_btfids vmlinux
> > > >   FAILED elf_update(WRITE): invalid section alignment  
> > > 
> > > hi,
> > > could you send your .config as well?  
> > 
> > reproduced.. checking on fix  
> 
> I discussed this with Mark (cc-ed) it seems to be a problem
> with linker when dealing with compressed debug info data,
> which is enabled in your .config
> 
> it works for me when I disable CONFIG_DEBUG_INFO_COMPRESSED option

Thanks for finding this!
I confirm that disabling CONFIG_DEBUG_INFO_COMPRESSED fixed the issue.


> Mark will fix this upstream, meanwhile he suggested workaround
> we can do in resolve_btfids tool, that I'll try to send shortly

Great!
-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer