linux-kernel - Re: ERROR: INT DW_ATE_unsigned

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Message-ID: <CA+icZUUNhtbv3sNkPd4Ac9rd5ZZ7DfNEqRKEHKWXEcpHd63c2g@mail.gmail.com>
Date:   Fri, 5 Feb 2021 16:40:51 +0100
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     dwarves@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        bpf@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Jan Engelhardt <jengelh@...i.de>,
        Domenico Andreoli <cavok@...ian.org>,
        Matthias Schwarzott <zzam@...too.org>,
        Andrii Nakryiko <andriin@...com>, Yonghong Song <yhs@...com>,
        Mark Wieelard <mjw@...hat.com>,
        Paul Moore <paul@...l-moore.com>,
        Ondrej Mosnacek <omosnace@...hat.com>,
        Daniel P. Berrangé <berrange@...hat.com>,
        Tom Stellard <tstellar@...hat.com>
Subject: Re: ERROR: INT DW_ATE_unsigned_1 Error emitting BTF type

On Fri, Feb 5, 2021 at 4:28 PM Arnaldo Carvalho de Melo
<arnaldo.melo@...il.com> wrote:
>
> Em Fri, Feb 05, 2021 at 04:23:59PM +0100, Sedat Dilek escreveu:
> > On Fri, Feb 5, 2021 at 3:41 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
> > >
> > > On Fri, Feb 5, 2021 at 3:37 PM Sedat Dilek <sedat.dilek@...il.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.
> > >
> > > Grepping the pahole sources:
> > >
> > > $ git grep DW_ATE
> > > dwarf_loader.c:         bt->is_bool = encoding == DW_ATE_boolean;
> > > dwarf_loader.c:         bt->is_signed = encoding == DW_ATE_signed;
> > >
> > > Missing DW_ATE_unsigned encoding?
> > >
> >
> > Checked the LLVM sources:
> >
> > clang/lib/CodeGen/CGDebugInfo.cpp:    Encoding =
> > llvm::dwarf::DW_ATE_unsigned_char;
> > clang/lib/CodeGen/CGDebugInfo.cpp:    Encoding = llvm::dwarf::DW_ATE_unsigned;
> > clang/lib/CodeGen/CGDebugInfo.cpp:    Encoding =
> > llvm::dwarf::DW_ATE_unsigned_fixed;
> > clang/lib/CodeGen/CGDebugInfo.cpp:
> >   ? llvm::dwarf::DW_ATE_unsigned
> > ...
> > lld/test/wasm/debuginfo.test:CHECK-NEXT:                DW_AT_encoding
> >  (DW_ATE_unsigned)
> >
> > So, I will switch from GNU ld.bfd v2.35.2 to LLD-12.
>
> Thanks for the research, probably your conclusion is correct, can you go
> the next step and add that part and check if the end result is the
> expected one?
>

Started a new build:

$ ps -ef | grep p[e]rf
dileks    529807  529775  0 16:32 pts/1    00:00:00 /usr/bin/perf_5.10
stat make V=1 -j4 LLVM=1 PAHOLE=/opt/pahole/bin/pahole
LOCALVERSION=-12-amd64-clang12-llvm KBUIL
D_VERBOSE=1 KBUILD_BUILD_HOST=iniza
KBUILD_BUILD_USER=sedat.dilek@...il.com
KBUILD_BUILD_TIMESTAMP=2021-02-05 bindeb-pkg
KDEB_PKGVERSION=5.11.0~rc6-12~bullseye+dileks1

$ scripts/diffconfig /boot/config-5.11.0-rc6-10-amd64-clang12-bfd .config
BUILD_SALT "5.11.0-rc6-10-amd64-clang12-bfd" ->
"5.11.0-rc6-11-amd64-clang12-llvm"
DEBUG_INFO_DWARF4 y -> n
LD_VERSION 235020000 -> 0
LLD_VERSION 0 -> 120000
+DEBUG_INFO_DWARF5 y
+LD_IS_LLD y
+TOOLS_SUPPORT_RELR y

Will take approx. 03:15 [hh:mm] and report later.

- Sedat -