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From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date:   Fri, 9 Dec 2022 17:27:59 -0800
Message-ID: <CAADnVQJmXAD3nC+TU7x2pL4tm07XupDDwf2thGcpfGSJ09u9+A@mail.gmail.com>
Subject: Re: [PULL] Networking for v6.1 final / v6.1-rc9 (with the diff stat :S)
To:     Jakub Kicinski <kuba@kernel.org>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        "David S. Miller" <davem@davemloft.net>,
        Network Development <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Jiri Olsa <olsajiri@gmail.com>, Yonghong Song <yhs@meta.com>
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On Fri, Dec 9, 2022 at 2:05 PM Jakub Kicinski <kuba@kernel.org> wrote:
>
> On Fri, 9 Dec 2022 13:00:01 -0800 Jakub Kicinski wrote:
> > On Fri, 9 Dec 2022 10:25:09 -0800 Linus Torvalds wrote:
> > > > There is an outstanding regression in BPF / Peter's static calls stuff,
> > >
> > > Looks like it's not related to the static calls. Jiri says that
> > > reverting that static call change makes no difference, and currently
> > > suspects a RCU race instead:
> > >
> > >   https://lore.kernel.org/bpf/Y5M9P95l85oMHki9@krava/T/#t
> > >
> > > Hmm?
> >
> > Yes. I can't quickly grok how the static call changes impacted
> > the locking. I'll poke the BPF people to give us a sense of urgency.
> > IDK how likely it is to get hold of Peter Z..
>
> Adding Alexei et al. to the CC.
> What I understood from off-list comments is the issue is not
> a showstopper and synchronize_rcu_tasks() seems like a good fix.

Confirming. The bug is not a show stopper.
The nature of the bug still needs to be understood though.