netdev - Re: [PATCHv10 bpf-next 2/4] xdp: extend xdp_redirect

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Message-ID: <20210426115427.GV3465@Leo-laptop-t470s>
Date:   Mon, 26 Apr 2021 19:54:27 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jiri Benc <jbenc@...hat.com>,
        Eelco Chaudron <echaudro@...hat.com>, ast@...nel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Björn Töpel <bjorn.topel@...il.com>,
        Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCHv10 bpf-next 2/4] xdp: extend xdp_redirect_map with
 broadcast support

On Mon, Apr 26, 2021 at 01:41:05PM +0200, Jesper Dangaard Brouer wrote:
> > > While running:
> > >  $ sudo ./xdp_redirect_map_multi -F i40e2 i40e2
> > >  Get interfaces 7 7
> > >  libbpf: elf: skipping unrecognized data section(23) .eh_frame
> > >  libbpf: elf: skipping relo section(24) .rel.eh_frame for section(23) .eh_frame
> > >  Forwarding   10140845 pkt/s
> > >  Forwarding   11767042 pkt/s
> > >  Forwarding   11783437 pkt/s
> > >  Forwarding   11767331 pkt/s
> > > 
> > > When starting:  sudo ./xdp_monitor --stats  
> > 
> > That seems the same issue I reported previously in our meeting.
> > https://bugzilla.redhat.com/show_bug.cgi?id=1906820#c4
> > 
> > I only saw it 3 times and can't reproduce it easily.
> > 
> > Do you have any idea where is the root cause?
> 
> All the information you need to find the root-cause is listed below.
> I have even decoded where in the code it happens, and also include the
> code with line-numbering and pointed to the line the crash happens in,
> I don't think it is possible for me to be more specific and help further.

Thanks, I mixed this issue with the one I got previously, which I haven't
figure out yet. For this one, I have sent a propose in another reply (that
fix it in trace point event). Would you please help review.

Hangbin