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From:   Eric Dumazet <edumazet@google.com>
Date:   Tue, 10 Aug 2021 20:02:44 +0200
Message-ID: <CANn89iJOFoMa2-Dx+_b8p0-FNNKhYn4DsB3AbtL7zR4bvNR5DA@mail.gmail.com>
Subject: Re: [syzbot] BUG: sleeping function called from invalid context in _copy_to_iter
To:     Shoaib Rao <rao.shoaib@oracle.com>
Cc:     Eric Dumazet <eric.dumazet@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        syzbot <syzbot+8760ca6c1ee783ac4abd@syzkaller.appspotmail.com>,
        Andrii Nakryiko <andrii@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>, bpf <bpf@vger.kernel.org>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Cong Wang <cong.wang@bytedance.com>,
        Daniel Borkmann <daniel@iogearbox.net>,
        David Miller <davem@davemloft.net>,
        jamorris@linux.microsoft.com,
        John Fastabend <john.fastabend@gmail.com>,
        Martin KaFai Lau <kafai@fb.com>, kpsingh@kernel.org,
        Jakub Kicinski <kuba@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>, netdev <netdev@vger.kernel.org>,
        Shuah Khan <shuah@kernel.org>,
        Song Liu <songliubraving@fb.com>,
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        Al Viro <viro@zeniv.linux.org.uk>, Yonghong Song <yhs@fb.com>
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On Tue, Aug 10, 2021 at 7:50 PM Shoaib Rao <rao.shoaib@oracle.com> wrote:
>
>
> On 8/10/21 2:19 AM, Eric Dumazet wrote:
> >
> > On 8/9/21 10:31 PM, Shoaib Rao wrote:
> >> On 8/9/21 1:09 PM, Eric Dumazet wrote:
> >>> I am guessing that even your test would trigger the warning,
> >>> if you make sure to include CONFIG_DEBUG_ATOMIC_SLEEP=y in your kernel build.
> >> Eric,
> >>
> >> Thanks for the pointer, have you ever over looked at something when coding?
> >>
> > I _think_ I was trying to help, not shaming you in any way.
> How did the previous email help? I did not get any reply when I asked
> what could be the cause.

Which previous email ? Are you expecting immediate answers to your emails ?
I am not working for Oracle.

> >
> > My question about spinlock/mutex was not sarcastic, you authored
> > 6 official linux patches, there is no evidence for linux kernel expertise.
>
> That is no measure of someones understanding. There are other OS's as
> well. I have worked on Solaris and other *unix* OS's for over 20+ years.
> This was an oversight on my part and I apologize, but instead of
> questioning my expertise it would have been helpful to say what might
> have caused it.


I sent two emails with _useful_ _information_.

If you felt you were attacked, I suggest you take a deep breath,
and read my emails without trying to change their intention and meaning.

If you think my emails were not useful, just ignore them, this is fine by me.