linux-kernel - RE: A potential deadlock in sockhash map

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Date:   Fri, 03 Feb 2023 20:19:21 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     Hsin-Wei Hung <hsinweih@....edu>,
        John Fastabend <john.fastabend@...il.com>,
        Jakub Sitnicki <jakub@...udflare.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RE: A potential deadlock in sockhash map

Hsin-Wei Hung wrote:
> Hi,
> 
> Our bpf runtime fuzzer (a customized syzkaller) triggered a lockdep warning
> in the bpf subsystem indicating a potential deadlock. We are able to
> trigger this bug on v5.15.25 and v5.19. The following code is a BPF PoC,
> and the lockdep warning is attached at the end.

Thanks, but can you test the latest kernel?

Or at least latest 5.15 stable, 5.15.25 is a bit old and is missing lots of
fixes. And 5.19 is not even a LTS so wouldn't have many fixes.

Ideally if possible testing bpf tree would be the most helpful.

 https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/

I believe we fixed a similar bug already so hoping this is just hitting an
already fixed bug. But, would be best to confirm thanks.

Thanks,
John