linux-kernel - Re: ERROR: INT DW_ATE_unsigned

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Date:   Fri, 5 Feb 2021 13:40:05 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Andrii Nakryiko <andriin@...com>, arnaldo.melo@...il.com,
        berrange@...hat.com, bpf <bpf@...r.kernel.org>, cavok@...ian.org,
        dwarves@...r.kernel.org, jengelh@...i.de,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Wielaard <mjw@...hat.com>,
        Ondrej Mosnacek <omosnace@...hat.com>, paul@...l-moore.com,
        Tom Stellard <tstellar@...hat.com>, Yonghong Song <yhs@...com>,
        zzam@...too.org
Subject: Re: ERROR: INT DW_ATE_unsigned_1 Error emitting BTF type

On Fri, Feb 5, 2021 at 1:17 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> 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"?

$ PATH=/path/to/tot/pahole/build:$PATH make LLVM=1 LLVM_IAS=1 -j72
KCFLAGS="-fbinutils-version=2.35"
...
  BTF     .btf.vmlinux.bin.o
[12919] INT DW_ATE_unsigned_1 Error emitting BTF type
Encountered error while encoding BTF.
...
  LD      vmlinux
  BTFIDS  vmlinux
FAILED: load BTF from vmlinux: Invalid argument
-- 
Thanks,
~Nick Desaulniers