Re: Kernel build error on BTFIDS vmlinux

Jesper Dangaard Brouer
2020-08-18T16:33:50Z

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