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

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Message-ID: <00000000000045769206209237db@google.com>
Date: Mon, 26 Aug 2024 01:50:24 -0700
From: syzbot <syzbot+c641161e97237326ea74@...kaller.appspotmail.com>
To: andrew@...n.ch, christophe.leroy@...roup.eu, davem@...emloft.net, 
	edumazet@...gle.com, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	linux@...blig.org, maxime.chevallier@...tlin.com, netdev@...r.kernel.org, 
	pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING: lock held when returning to user space in ethnl_act_cable_test

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c641161e97237326ea74@...kaller.appspotmail.com
Fixes: 3688ff3077d3 ("net: ethtool: cable-test: Target the command to the requested PHY")

================================================
WARNING: lock held when returning to user space!
6.11.0-rc4-syzkaller-00565-gf9db28bb09f4 #0 Not tainted
------------------------------------------------
syz-executor124/5240 is leaving the kernel with locks still held!
1 lock held by syz-executor124/5240:
 #0: ffffffff8fc84b88 (rtnl_mutex){+.+.}-{3:3}, at: ethnl_act_cable_test+0x187/0x3f0 net/ethtool/cabletest.c:74


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
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