netdev - Re: Kernel build error on BTFIDS vmlinux

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Message-ID: <20200818134543.GD177896@krava>
Date:   Tue, 18 Aug 2020 15:45:43 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>, sdf@...gle.com,
        andriin@...com, Mark Wielaard <mjw@...hat.com>
Subject: Re: Kernel build error on BTFIDS vmlinux

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

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

thanks,
jirka