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From:   Eric Dumazet <edumazet@google.com>
Date:   Tue, 21 Sep 2021 18:56:48 -0700
Message-ID: <CANn89iKVAcX2GnQwVbQLd+ADGRVdWtD07q7=Brw5HRSoc0K2PQ@mail.gmail.com>
Subject: Re: KASAN: use-after-free Read in tcp_write_timer_handler
To:     Hao Sun <sunhao.th@gmail.com>
Cc:     David Miller <davem@davemloft.net>,
        David Ahern <dsahern@kernel.org>,
        Jakub Kicinski <kuba@kernel.org>,
        netdev <netdev@vger.kernel.org>,
        Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
        Andrii Nakryiko <andrii@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>, bpf <bpf@vger.kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        John Fastabend <john.fastabend@gmail.com>,
        Martin KaFai Lau <kafai@fb.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>
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On Tue, Sep 21, 2021 at 6:43 PM Hao Sun <sunhao.th@gmail.com> wrote:
>
> Hello,
>
> When using Healer to fuzz the latest Linux kernel, the following crash
> was triggered.
>

We have dozens of such reports provided already by syzbot.

If you do not provide a repro, there is little hope.