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From: Jiri Olsa <jolsa@redhat.com>
To: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>,
	Jiri Olsa <jolsa@kernel.org>, Yonghong Song <yhs@fb.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@kernel.org>,
	Masahiro Yamada <masahiroy@kernel.org>, bpf <bpf@vger.kernel.org>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	Tom Stellard <tstellar@redhat.com>
Subject: Re: Check pahole availibity and BPF support of toolchain before starting a Linux kernel build
Date: Thu, 14 Jan 2021 15:24:31 +0100	[thread overview]
Message-ID: <20210114142431.GB1416940@krava> (raw)
In-Reply-To: <CA+icZUWaMktPBYy9P-gbgL-AD7EEPrrvS4jenahJ-3HkxOOC0g@mail.gmail.com>

On Thu, Jan 14, 2021 at 03:13:18PM +0100, Sedat Dilek wrote:
> On Mon, Jan 11, 2021 at 11:31 PM Jiri Olsa <jolsa@redhat.com> wrote:
> >
> > On Mon, Jan 11, 2021 at 10:30:22PM +0100, Sedat Dilek wrote:
> >
> > SNIP
> >
> > > > >
> > > > > Building a new Linux-kernel...
> > > > >
> > > > > - Sedat -
> > > > >
> > > > > [1] https://git.kernel.org/pub/scm/devel/pahole/pahole.git/
> > > > > [2] https://github.com/ClangBuiltLinux/tc-build/issues/129#issuecomment-758026878
> > > > > [3] https://github.com/ClangBuiltLinux/tc-build/issues/129#issuecomment-758056553
> > > >
> > > > There are no significant bug fixes between pahole 1.19 and master that
> > > > would solve this problem, so let's try to repro this.
> > > >
> > >
> > > You are right pahole fom latest Git does not solve the issue.
> > >
> > > + info BTFIDS vmlinux
> > > + [  != silent_ ]
> > > + printf   %-7s %s\n BTFIDS vmlinux
> > >  BTFIDS  vmlinux
> > > + ./tools/bpf/resolve_btfids/resolve_btfids vmlinux
> > > FAILED: load BTF from vmlinux: Invalid argument
> >
> > hm, is there a .BTF section in vmlinux?
> >
> > is this working over vmlinux:
> >  $ bpftool btf dump file ./vmlinux
> >
> 
> I switched to LLVM v12 from <apt.llvm.org> and saw the same FAILED line.
> 
> The generated vmlinux file is cleaned on failure.
> 
> + info BTFIDS vmlinux
> + [  != silent_ ]
> + printf   %-7s %s\n BTFIDS vmlinux
>  BTFIDS  vmlinux
> + ./tools/bpf/resolve_btfids/resolve_btfids vmlinux
> FAILED: load BTF from vmlinux: Invalid argument

did pahole generated the .BTF section? earlier in the log

jirka


  reply	other threads:[~2021-01-14 14:26 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-11 12:48 Check pahole availibity and BPF support of toolchain before starting a Linux kernel build Sedat Dilek
2021-01-11 16:05 ` Yonghong Song
2021-01-11 17:56   ` Sedat Dilek
2021-01-11 21:03     ` Andrii Nakryiko
     [not found]       ` <CA+icZUVrF_LCVhELbNLA7=FzEZK4=jk3QLD9XT2w5bQNo=nnOA@mail.gmail.com>
2021-01-11 22:31         ` Jiri Olsa
2021-01-11 22:34           ` Tom Stellard
2021-01-12 10:46             ` Jiri Olsa
2021-01-12 13:10               ` Jiri Olsa
2021-01-12 16:14                 ` Sedat Dilek
2021-01-12 16:21                   ` Jiri Olsa
2021-01-12 17:18                     ` Sedat Dilek
2021-01-12 20:47                     ` Sedat Dilek
2021-01-12 21:36                       ` Sedat Dilek
2021-01-14 14:13           ` Sedat Dilek
2021-01-14 14:24             ` Jiri Olsa [this message]
2021-01-14 14:29               ` Sedat Dilek
     [not found]                 ` <CA+icZUXp5gkxCr+mybQ8uO3xx+rVmmRSnN7Dfx0Xmr+VQWyZAA@mail.gmail.com>
2021-01-14 15:13                   ` Sedat Dilek
2021-01-12  0:57         ` Yonghong Song
2021-01-12  4:09           ` Sedat Dilek

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