linux-kernel - Re: [syzbot] [mptcp?] KASAN: slab-use-after-free Read in mptcp_pm_del_add

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Message-ID: <CANn89iJmyNNQEmy714JqYey=P5JKgzmPvOSaZVV4OUfy5e1xGw@mail.gmail.com>
Date: Mon, 17 Nov 2025 00:31:57 -0800
From: Eric Dumazet <edumazet@...gle.com>
To: syzbot <syzbot+2a6fbf0f0530375968df@...kaller.appspotmail.com>
Cc: davem@...emloft.net, geliang@...nel.org, horms@...nel.org, kuba@...nel.org, 
	linux-kernel@...r.kernel.org, martineau@...nel.org, matttbe@...nel.org, 
	mptcp@...ts.linux.dev, netdev@...r.kernel.org, pabeni@...hat.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mptcp?] KASAN: slab-use-after-free Read in mptcp_pm_del_add_timer

On Sun, Nov 16, 2025 at 11:50 PM syzbot
<syzbot+2a6fbf0f0530375968df@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    98ac9cc4b445 Merge tag 'f2fs-fix-6.18-rc2' of git://git.ke..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1712bdcd980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=af9170887d81dea1
> dashboard link: https://syzkaller.appspot.com/bug?extid=2a6fbf0f0530375968df
> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/aa708867a71c/disk-98ac9cc4.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/5d853b65c8dc/vmlinux-98ac9cc4.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/f0f012153d60/bzImage-98ac9cc4.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+2a6fbf0f0530375968df@...kaller.appspotmail.com

I can post a V2 of
https://lore.kernel.org/netdev/20251114223136.113011-1-edumazet@google.com/T/#u
including two more tags.