netdev - Re: [syzbot] [net?] WARNING: lock held when returning to user space in ethnl_act_cable

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Message-ID: <20240826135433.47c87f62@fedora-3.home>
Date: Mon, 26 Aug 2024 13:54:33 +0200
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: syzbot <syzbot+c641161e97237326ea74@...kaller.appspotmail.com>
Cc: andrew@...n.ch, christophe.leroy@...roup.eu, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, linux-kernel@...r.kernel.org,
 linux@...blig.org, netdev@...r.kernel.org, pabeni@...hat.com,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING: lock held when returning to user space
 in ethnl_act_cable_test

Hello,

On Mon, 26 Aug 2024 01:50:24 -0700
syzbot <syzbot+c641161e97237326ea74@...kaller.appspotmail.com> wrote:

> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    f9db28bb09f4 Merge branch 'net-redundant-judgments'
> git tree:       net-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=115eb015980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=df2f0ed7e30a639d
> dashboard link: https://syzkaller.appspot.com/bug?extid=c641161e97237326ea74
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17d2d609980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1741fbf5980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/585e02f7fe7b/disk-f9db28bb.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/b9faf5d24900/vmlinux-f9db28bb.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/f9df5868ea4f/bzImage-f9db28bb.xz
> 
> The issue was bisected to:
> 
> commit 3688ff3077d3f334cee1d4b61d8bfb6a9508c2d2
> Author: Maxime Chevallier <maxime.chevallier@...tlin.com>
> Date:   Wed Aug 21 15:10:05 2024 +0000
> 
>     net: ethtool: cable-test: Target the command to the requested PHY
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=146fcd8d980000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=166fcd8d980000
> console output: https://syzkaller.appspot.com/x/log.txt?x=126fcd8d980000

Looks like there's indeed a mistake in the error path for that command,
I'll send a fix for that.

Thanks,

Maxime