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Message-ID: <4837d1401e1610764eeea7446280de87d51912f6.camel@redhat.com>
Date: Thu, 14 Dec 2023 16:18:27 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: syzbot <syzbot+5a01c3a666e726bc8752@...kaller.appspotmail.com>,
davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
linux-kernel@...r.kernel.org, martineau@...nel.org, matttbe@...nel.org,
mptcp@...ts.linux.dev, netdev@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mptcp?] WARNING in mptcp_check_listen_stop
On Wed, 2023-12-13 at 10:53 -0800, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 2513974cc3e1 Merge branch 'stmmac-bug-fixes'
> git tree: net
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=116337fae80000
> kernel config: https://syzkaller.appspot.com/x/.config?x=b50bd31249191be8
> dashboard link: https://syzkaller.appspot.com/bug?extid=5a01c3a666e726bc8752
> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1119061ee80000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=110ca006e80000
It looks like tcp_diag_destroy is closing the listener subflow, while
the mptcp stack is not expecting anyone to touch it while in listener
status. I guess we can relax the mptcp_check_listen_stop checks.
/P
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