Re: Kernel build error on BTFIDS vmlinux

[Jiri Olsa]

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