linux-kernel - Re: ERROR: INT DW_ATE_unsigned

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Date:   Fri, 5 Feb 2021 22:16:50 +0100
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     andriin@...com, arnaldo.melo@...il.com, berrange@...hat.com,
        bpf@...r.kernel.org, cavok@...ian.org, dwarves@...r.kernel.org,
        jengelh@...i.de, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        mjw@...hat.com, omosnace@...hat.com, paul@...l-moore.com,
        tstellar@...hat.com, yhs@...com, zzam@...too.org
Subject: Re: ERROR: INT DW_ATE_unsigned_1 Error emitting BTF type

On Fri, Feb 5, 2021 at 10:10 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> > Hi,
> >
> > when building with pahole v1.20 and binutils v2.35.2 plus Clang
> > v12.0.0-rc1 and DWARF-v5 I see:
> > ...
> > + info BTF .btf.vmlinux.bin.o
> > + [  != silent_ ]
> > + printf   %-7s %s\n BTF .btf.vmlinux.bin.o
> >  BTF     .btf.vmlinux.bin.o
> > + LLVM_OBJCOPY=/opt/binutils/bin/objcopy /opt/pahole/bin/pahole -J
> > .tmp_vmlinux.btf
> > [115] INT DW_ATE_unsigned_1 Error emitting BTF type
> > Encountered error while encoding BTF.
>
> Yes, I observe this error, too.
>
> https://gist.github.com/nickdesaulniers/ae8c9efbe4da69b1cf0dce138c1d2781
>
> via v9 of my DWARF v5 series, which should help make this easier to
> reproduce:
> https://lore.kernel.org/lkml/CA+icZUW3sg_PkbmKSFMs6EqwQV7=hvKuAgZSsbg=Qr6gTs7RbQ@mail.gmail.com/T/#m45ec7e6df4c4b5e9da034b95d7dfc8e2a0c81dac

Thanks Nick for confirming the error.

Ah, I see you passed:

make LLVM=1 LLVM_IAS=1 ...

Can you by chance try with KCFLAGS="-fbinutils-version=2.35"?

- Sedat -