linux-kernel - Re: [syzbot] [net?] WARNING: refcount bug in ethnl_phy

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Message-ID: <20240911134051.7c3ad4a3@fedora.home>
Date: Wed, 11 Sep 2024 13:40:51 +0200
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: syzbot <syzbot+e9ed4e4368d450c8f9db@...kaller.appspotmail.com>,
 christophe.leroy@...roup.eu, davem@...emloft.net, kuba@...nel.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING: refcount bug in ethnl_phy_done

Hi Eric,

On Wed, 11 Sep 2024 12:08:36 +0200
Eric Dumazet <edumazet@...gle.com> wrote:

> > I'm currently investigating this. I couldn't reproduce it though, even
> > with the C reproducer, although this was on an arm64 box. I'll give it
> > a try on x86_64 with the provided .config, see if I can figure out
> > what's going on, as it looks like the ethnl_phy_start() doesn't get
> > called.  
> 
> Make sure to have in your .config
> 
> CONFIG_REF_TRACKER=y
> CONFIG_NET_DEV_REFCNT_TRACKER=y
> CONFIG_NET_NS_REFCNT_TRACKER=y

Good point, I now reproduce the issue indeed. Thanks a lot for the tips,

Maxime