netdev - Re: [PATCH net] netrom: fix possible deadlock in nr_rt_device

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Message-ID: <20250609155729.7922836d@kernel.org>
Date: Mon, 9 Jun 2025 15:57:29 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Denis Arefev <arefev@...mel.ru>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
 <horms@...nel.org>, Nikita Marushkin <hfggklm@...il.com>, Ilya Shchipletsov
 <rabbelkin@...l.ru>, Hongbo Li <lihongbo22@...wei.com>,
 linux-hams@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org,
 stable@...r.kernel.org,
 syzbot+ccdfb85a561b973219c7@...kaller.appspotmail.com
Subject: Re: [PATCH net] netrom: fix possible deadlock in nr_rt_device_down

On Thu,  5 Jun 2025 13:54:48 +0300 Denis Arefev wrote:
> Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

I suspect syzbot is the only user of this code.
Can you delete one of the locks to make the maintenance simpler?
At a glance - I don't think your fix covers all the ABBA cases.
-- 
pw-bot: cr