netdev - Re: INFO: rcu detected stall in is_bpf_text

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Message-ID: <CAAeHK+yz+O=Rz4rJwXeBsMjGe6mrYvF0prUvDN0djPtL+gcD_w@mail.gmail.com>
Date:   Tue, 29 May 2018 13:53:21 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     Xin Long <lucien.xin@...il.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        syzbot <syzbot+3dcd59a1f907245f891f@...kaller.appspotmail.com>,
        ast@...nel.org, Daniel Borkmann <daniel@...earbox.net>,
        LKML <linux-kernel@...r.kernel.org>,
        network dev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: INFO: rcu detected stall in is_bpf_text_address

On Mon, May 28, 2018 at 8:22 PM, Marcelo Ricardo Leitner
<marcelo.leitner@...il.com> wrote:
>
> The reproducer has:
> r0 = socket$inet6(0xa, 0x1, 0x8010000000000084)
>
> Considering socket() prototype uses an int for the 3rd argument, how
> should I interpret this 64b value?
>
> 0x84 is IPPROTO_SCTP, but don't know about the 0x8010000000000000 in
> there.

Hi Marcelo,

It gets stripped to int the same way C does it, so the value would be 0x84.

Thanks!