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Date:   Tue, 10 Aug 2021 20:02:44 +0200
From:   Eric Dumazet <>
To:     Shoaib Rao <>
Cc:     Eric Dumazet <>,
        Dmitry Vyukov <>,
        syzbot <>,
        Andrii Nakryiko <>,
        Alexei Starovoitov <>, bpf <>,
        Christian Brauner <>,
        Cong Wang <>,
        Daniel Borkmann <>,
        David Miller <>,,
        John Fastabend <>,
        Martin KaFai Lau <>,,
        Jakub Kicinski <>,
        LKML <>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <>, netdev <>,
        Shuah Khan <>,
        Song Liu <>,
        syzkaller-bugs <>,
        Al Viro <>, Yonghong Song <>
Subject: Re: [syzbot] BUG: sleeping function called from invalid context in _copy_to_iter

On Tue, Aug 10, 2021 at 7:50 PM Shoaib Rao <> 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.

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