Re: [PATCH v3 0/2] Kbuild: DWARF v5 support

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On Thu, Jan 14, 2021 at 8:13 PM Yonghong Song <yhs@xxxxxx> wrote:
>
>
>
> On 1/14/21 11:01 AM, Nick Desaulniers wrote:
> > On Thu, Jan 14, 2021 at 10:53 AM Nick Desaulniers
> > <ndesaulniers@xxxxxxxxxx> wrote:
> >>
> >> On Wed, Jan 13, 2021 at 10:18 PM Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote:
> >>>
> >>> On Wed, Jan 13, 2021 at 11:25 PM Caroline Tice <cmtice@xxxxxxxxxx> wrote:
> >>>>
> >>>> On Tue, Jan 12, 2021 at 3:17 PM Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote:
> >>>>>
> >>>>> Unfortunately, I see with CONFIG_DEBUG_INFO_DWARF5=y and
> >>>>> CONFIG_DEBUG_INFO_BTF=y:
> >>>>>
> >>>>> die__process_inline_expansion: DW_TAG_INVALID (0x48) @ <0x3f0dd5a> not handled!
> >>>>> die__process_function: DW_TAG_INVALID (0x48) @ <0x3f0dd69> not handled!
> >>
> >> I can confirm that I see a stream of these warnings when building with
> >> this patch series applied, and those two configs enabled.
> >>
> >> rebuilding with `make ... V=1`, it looks like the call to:
> >>
> >> + pahole -J .tmp_vmlinux.btf
> >>
> >> is triggering these.
> >>
> >> Shall I send a v4 that adds a Kconfig dependency on !DEBUG_INFO_BTF?
> >> Does pahole have a bug tracker?
>
> pahole could have issues for dwarf5 since as far as I know, people just
> use dwarf2/dwarf4 with config functions in the kernel.
>
> Where is the link of the patch to add CONFIG_DEBUG_INFO_DWARF5 to linux?
> I think you can add CONFIG_DEBUG_INFO_DWARF5 to kernel with dependency
> of !CONFIG_DEBUG_INFO_BTF. At the same time, people can debug pahole
> issues. Once it is resolved, !CONFIG_DEBUG_INFO_BTF dependency can be
> removed with proper pahole version change in kernel.
>

Yeah, sounds like a good idea.

- Sedat -

> >
> > FWIW, my distro packages pahole v1.17; rebuilt with ToT v1.19 from
> > source and also observe the issue.
> >



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