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Message-ID: <e4154971623ec3cfd3b500e0ba1e09301d5fcbb0.camel@redhat.com>
Subject: Re: [syzbot] [mptcp?] WARNING in subflow_data_ready (2)
From: Paolo Abeni <pabeni@redhat.com>
To: syzbot <syzbot+732ab7be796ec0d104ac@syzkaller.appspotmail.com>, 
	davem@davemloft.net, edumazet@google.com, geliang.tang@linux.dev, 
	geliang.tang@suse.com, kuba@kernel.org, linux-kernel@vger.kernel.org, 
	martineau@kernel.org, matttbe@kernel.org, mptcp@lists.linux.dev, 
	netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com
Date: Mon, 05 Feb 2024 17:21:36 +0100
In-Reply-To: <000000000000e8ecae060fae7a47@google.com>
References: <000000000000e8ecae060fae7a47@google.com>
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On Wed, 2024-01-24 at 02:25 -0800, syzbot wrote:
> Hello,
>=20
> syzbot found the following issue on:
>=20
> HEAD commit:    6613476e225e Linux 6.8-rc1
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=3D1200cf0de8000=
0
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3Df9804db253bdf=
c61
> dashboard link: https://syzkaller.appspot.com/bug?extid=3D732ab7be796ec0d=
104ac
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for D=
ebian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=3D111fe2bfe80=
000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=3D17abc23be8000=
0
>=20
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/cdad5c52fcde/dis=
k-6613476e.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/14491fee3433/vmlinu=
x-6613476e.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/953a5864daf4/b=
zImage-6613476e.xz
>=20
> The issue was bisected to:
>=20
> commit 14c56686a64c65ba716ff48f1f4b19c85f4cb2a9
> Author: Geliang Tang <geliang.tang@suse.com>
> Date:   Wed Oct 18 18:23:55 2023 +0000
>=20
>     mptcp: avoid sending RST when closing the initial subflow
>=20
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=3D159a9427e8=
0000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=3D179a9427e8=
0000
> console output: https://syzkaller.appspot.com/x/log.txt?x=3D139a9427e8000=
0
>=20
> IMPORTANT: if you fix the issue, please add the following tag to the comm=
it:
> Reported-by: syzbot+732ab7be796ec0d104ac@syzkaller.appspotmail.com
> Fixes: 14c56686a64c ("mptcp: avoid sending RST when closing the initial s=
ubflow")

I forgot to mention this is looks like a legit mptcp-related issue.

There is a fix for this in the mptcp devel branch that should land here
somewhat soonish.

Cheers,

Paolo