From: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
To: Xin Long <lucien.xin@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
syzbot <syzbot+3dcd59a1f907245f891f@syzkaller.appspotmail.com>,
ast@kernel.org, Daniel Borkmann <daniel@iogearbox.net>,
LKML <linux-kernel@vger.kernel.org>,
network dev <netdev@vger.kernel.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: Re: INFO: rcu detected stall in is_bpf_text_address
Date: Mon, 28 May 2018 14:55:46 -0300 [thread overview]
Message-ID: <20180528175546.GD3787@localhost.localdomain> (raw)
In-Reply-To: <CADvbK_e7LXc7minSmaPw6iZvjWo215wG-pPAS0gr58+-VxUO7Q@mail.gmail.com>
On Sun, May 20, 2018 at 04:26:03PM +0800, Xin Long wrote:
> On Sat, May 19, 2018 at 11:57 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> > SCTP experts, please take a look.
> >
> > On 05/19/2018 08:55 AM, syzbot wrote:
> >> Hello,
> >>
> >> syzbot found the following crash on:
> >>
> >> HEAD commit: 73fcb1a370c7 Merge branch 'akpm' (patches from Andrew)
> >> git tree: upstream
> >> console output: https://syzkaller.appspot.com/x/log.txt?x=1462ec0f800000
> >> kernel config: https://syzkaller.appspot.com/x/.config?x=f3b4e30da84ec1ed
> >> dashboard link: https://syzkaller.appspot.com/bug?extid=3dcd59a1f907245f891f
> >> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
> >> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1079cf8f800000
> Thank you.
> The Reproducer is more than helpful.
>
> setsockopt$inet_sctp6_SCTP_RTOINFO(r0, 0x84, 0x0,
> &(0x7f0000000140)={0x0, 0x6, 0x7, 0x4}, 0x10)
>
> It set rto_min=6 and rto_max=7, these are too small values.
Considering
struct sctp_rtoinfo {
sctp_assoc_t srto_assoc_id;
__u32 srto_initial;
__u32 srto_max;
__u32 srto_min;
};
Isn't this actually equivalent to:
struct sctp_rtoinfo foo = {
.srto_assoc_id = 0,
.srto_initial = 6,
.srto_max = 7,
.srto_min = 4 /* instead of 6 */
};
?
This doesn't change a thing in the analysis, it's just to be sure
which one is right.
next prev parent reply other threads:[~2018-05-28 17:55 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-19 15:55 INFO: rcu detected stall in is_bpf_text_address syzbot
2018-05-19 15:57 ` Eric Dumazet
2018-05-20 1:45 ` Marcelo Ricardo Leitner
2018-05-20 8:26 ` Xin Long
2018-05-22 0:43 ` Marcelo Ricardo Leitner
2018-05-22 0:43 ` Marcelo Ricardo Leitner
2018-05-28 17:55 ` Marcelo Ricardo Leitner [this message]
2018-05-28 18:22 ` Marcelo Ricardo Leitner
2018-05-29 11:53 ` Andrey Konovalov
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