linux-kernel - Re: [syzbot] [mptcp?] WARNING in __mptcp_clean

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Message-ID: <0fcb7d4a-bdda-44f9-8f86-3e7669b65bb1@redhat.com>
Date: Fri, 17 Jan 2025 16:54:34 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: syzbot <syzbot+ebc0b8ae5d3590b2c074@...kaller.appspotmail.com>,
 linux-kernel@...r.kernel.org, mptcp@...ts.linux.dev,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mptcp?] WARNING in __mptcp_clean_una (2)

On 1/17/25 2:29 AM, syzbot wrote:
> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
> WARNING in __mptcp_clean_una
> 
> MPTCP: snd_una 52e55b5d657ac4e2 snd_nxt 52e55b5d657ac4e2 write_seq 52e55b5d657ac4e2 idsn 52e55b5d657ac4e1 dfrag seq 3d10b145d4f45513 len 32728

It looks like we are not catching a disconnect().

Add the missing accounting and more debug, in case the problem is elsewhere.

/P
View attachment "mptcp_clean_una_splat_debug_disc.patch" of type "text/x-patch" (1832 bytes)