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From: John Fastabend <john.fastabend@gmail.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>,
	Eelco Chaudron <echaudro@redhat.com>
Cc: Yonghong Song <yhs@fb.com>,
	Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	Xdp <xdp-newbies@vger.kernel.org>, bpf <bpf@vger.kernel.org>
Subject: Re: Trying the bpf trace a bpf xdp program
Date: Wed, 04 Dec 2019 10:03:49 -0800
Message-ID: <5de7f5057f957_96d2b0feaf1e5bc19@john-XPS-13-9370.notmuch> (raw)
In-Reply-To: <CAEf4BzaTRc8dPxZnWhVZe7xpyMwpL1NEgGQyBjeXnsaN_D5CWA@mail.gmail.com>

Andrii Nakryiko wrote:
> On Wed, Dec 4, 2019 at 5:20 AM Eelco Chaudron <echaudro@redhat.com> wrote:
> >

[...]

> >
> > PS: If I run the latest pahole (v1.15) on the .o files, I get the
> > following libbpf error: “libbpf: Cannot find bpf_func_info for main
> > program sec fexit/xdp_prog_simple. Ignore all bpf_func_info.”
> >
> 
> pahole is not supposed to be run on BPF object file. It's needed only
> to do DWARF to BTF conversion for kernel itself. So never mind this
> one. The NULL dereference, though, seems like a bug, I agree with
> Yonghong.

Really? I've been using pahole on BPF object files regularly mostly
to test structures match up with kernel pahole output but its always
worked on my side. Even pahole -j seems to work fine here.

  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <E53E0693-1C3A-4B47-B205-DC8E5DAF3619@redhat.com>
2019-11-28 18:18 ` Alexei Starovoitov
2019-11-28 19:16   ` Eelco Chaudron
2019-11-28 19:47     ` Alexei Starovoitov
2019-11-29 16:30       ` Eelco Chaudron
2019-11-29 16:52         ` Yonghong Song
2019-12-02 16:34           ` Eelco Chaudron
2019-12-02 16:48             ` Yonghong Song
2019-12-04 13:19               ` Eelco Chaudron
2019-12-04 14:58                 ` Yonghong Song
2019-12-04 18:01                   ` Yonghong Song
2019-12-04 18:52                     ` Eelco Chaudron
2019-12-05 12:40                       ` Eelco Chaudron
2019-12-05 17:35                         ` Y Song
2019-12-06 13:04                           ` Eelco Chaudron
2019-12-07 16:51                             ` Alexei Starovoitov
2019-12-04 16:31                 ` Andrii Nakryiko
2019-12-04 18:03                   ` John Fastabend [this message]
2019-12-04 21:19                     ` Andrii Nakryiko

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