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Date:   Fri, 9 Dec 2022 14:05:50 -0800
From:   Jakub Kicinski <kuba@kernel.org>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     davem@davemloft.net, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, pabeni@redhat.com,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Jiri Olsa <olsajiri@gmail.com>, Yonghong Song <yhs@meta.com>
Subject: Re: [PULL] Networking for v6.1 final / v6.1-rc9 (with the diff stat
 :S)
Message-ID: <20221209140550.571e6b65@kernel.org>
In-Reply-To: <20221209130001.0f90f7f8@kernel.org>
References: <20221208205639.1799257-1-kuba@kernel.org>
        <20221208210009.1799399-1-kuba@kernel.org>
        <CAHk-=wji_NB6hO+35Ruty3DjQkZ+0MkAG9RZpfXNTiWv4NZH3w@mail.gmail.com>
        <20221209130001.0f90f7f8@kernel.org>
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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.