linux-kernel - Re: [syzbot] BUG: sleeping function called from invalid context in _copy_to

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Message-ID: <CANn89iJOFoMa2-Dx+_b8p0-FNNKhYn4DsB3AbtL7zR4bvNR5DA@mail.gmail.com>
Date:   Tue, 10 Aug 2021 20:02:44 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Shoaib Rao <rao.shoaib@...cle.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+8760ca6c1ee783ac4abd@...kaller.appspotmail.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Cong Wang <cong.wang@...edance.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        jamorris@...ux.microsoft.com,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>, kpsingh@...nel.org,
        Jakub Kicinski <kuba@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, netdev <netdev@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>,
        Song Liu <songliubraving@...com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>, Yonghong Song <yhs@...com>
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 <rao.shoaib@...cle.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.