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From: Nick Desaulniers <ndesaulniers@google.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andrii@kernel.org>,
	Jiri Olsa <jolsa@kernel.org>
Cc: Sedat Dilek <sedat.dilek@gmail.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Nathan Chancellor <natechancellor@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Clang-Built-Linux ML <clang-built-linux@googlegroups.com>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	linux-arch <linux-arch@vger.kernel.org>,
	Jakub Jelinek <jakub@redhat.com>,
	Fangrui Song <maskray@google.com>,
	Caroline Tice <cmtice@google.com>,
	Nick Clifton <nickc@redhat.com>,
	dwarves@vger.kernel.org, bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH v5 0/3] Kbuild: DWARF v5 support
Date: Wed, 3 Feb 2021 17:31:05 -0800	[thread overview]
Message-ID: <CAKwvOdmniAMZD0LiFdr5N8eOwHqNFED2Pd=pwOFF2Y8eSRXUHA@mail.gmail.com> (raw)
In-Reply-To: <20210117201500.GO457607@kernel.org>

On Sun, Jan 17, 2021 at 12:14 PM Arnaldo Carvalho de Melo
<acme@kernel.org> wrote:
>
> Em Fri, Jan 15, 2021 at 03:43:06PM -0800, Yonghong Song escreveu:
> >
> >
> > On 1/15/21 3:34 PM, Nick Desaulniers wrote:
> > > On Fri, Jan 15, 2021 at 3:24 PM Yonghong Song <yhs@fb.com> wrote:
> > > >
> > > >
> > > >
> > > > On 1/15/21 1:53 PM, Sedat Dilek wrote:
> > > > > En plus, I encountered breakage with GCC v10.2.1 and LLVM=1 and
> > > > > CONFIG_DEBUG_INFO_DWARF4.
> > > > > So might be good to add a "depends on !DEBUG_INFO_BTF" in this combination.
> > >
> > > Can you privately send me your configs that repro? Maybe I can isolate
> > > it to a set of configs?
> > >
> > > >
> > > > I suggested not to add !DEBUG_INFO_BTF to CONFIG_DEBUG_INFO_DWARF4.
> > > > It is not there before and adding this may suddenly break some users.
> > > >
> > > > If certain combination of gcc/llvm does not work for
> > > > CONFIG_DEBUG_INFO_DWARF4 with pahole, this is a bug bpf community
> > > > should fix.
> > >
> > > Is there a place I should report bugs?
> >
> > You can send bug report to Arnaldo Carvalho de Melo <acme@kernel.org>,
> > dwarves@vger.kernel.org and bpf@vger.kernel.org.
>
> I'm coming back from vacation, will try to read the messages and see if
> I can fix this.

IDK about DWARF v4; that seems to work for me.  I was previously observing
https://bugzilla.redhat.com/show_bug.cgi?id=1922698
with DWARF v5.  I just re-pulled the latest pahole, rebuilt, and no
longer see that warning.

I now observe a different set.  I plan on attending "BPF office hours
tomorrow morning," but if anyone wants a sneak peak of the errors and
how to reproduce:
https://gist.github.com/nickdesaulniers/ae8c9efbe4da69b1cf0dce138c1d2781


(FWIW: some other folks are hitting issues now with kernel's lack of
DWARF v5 support: https://bugzilla.redhat.com/show_bug.cgi?id=1922707)
-- 
Thanks,
~Nick Desaulniers

  reply	other threads:[~2021-02-04  1:32 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-15 21:06 [PATCH v5 0/3] Kbuild: DWARF v5 support Nick Desaulniers
2021-01-15 21:06 ` [PATCH v5 1/3] Remove $(cc-option,-gdwarf-4) dependency from CONFIG_DEBUG_INFO_DWARF4 Nick Desaulniers
2021-01-15 21:47   ` Sedat Dilek
2021-01-15 21:51     ` Nick Desaulniers
2021-01-15 23:54       ` Masahiro Yamada
2021-01-20  5:57         ` Masahiro Yamada
2021-01-15 21:59   ` Fangrui Song
2021-01-15 22:03     ` Sedat Dilek
2021-01-15 21:06 ` [PATCH v5 2/3] Kbuild: make DWARF version a choice Nick Desaulniers
2021-01-15 21:42   ` Sedat Dilek
2021-01-15 22:05     ` Fangrui Song
2021-01-20 20:40   ` Nathan Chancellor
2021-01-21  2:35     ` Sedat Dilek
2021-01-15 21:06 ` [PATCH v5 3/3] Kbuild: implement support for DWARF v5 Nick Desaulniers
2021-01-15 21:45   ` Sedat Dilek
2021-01-15 21:49     ` Nick Desaulniers
2021-01-15 21:57       ` Sedat Dilek
2021-01-15 21:53 ` [PATCH v5 0/3] Kbuild: DWARF v5 support Sedat Dilek
2021-01-15 23:24   ` Yonghong Song
2021-01-15 23:34     ` Nick Desaulniers
2021-01-15 23:42       ` Andrii Nakryiko
2021-01-15 23:43       ` Yonghong Song
2021-01-17 20:15         ` Arnaldo Carvalho de Melo
2021-02-04  1:31           ` Nick Desaulniers [this message]
2021-02-04  2:57             ` Andrii Nakryiko
2021-02-04  3:13               ` Nick Desaulniers
2021-02-04 23:54                 ` Andrii Nakryiko
2021-02-05  0:04                   ` Nick Desaulniers
2021-02-04  8:42               ` Sedat Dilek
2021-02-04  8:59                 ` Sedat Dilek

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