linux-kernel - [syzbot] [net?] WARNING in __linkwatch_sync

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Message-ID: <684a39aa.a00a0220.1eb5f5.00fa.GAE@google.com>
Date: Wed, 11 Jun 2025 19:21:30 -0700
From: syzbot <syzbot+b8c48ea38ca27d150063@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING in __linkwatch_sync_dev (2)

Hello,

syzbot found the following issue on:

HEAD commit:    f09079bd04a9 Merge tag 'powerpc-6.16-2' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16e9260c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e24211089078d6c6
dashboard link: https://syzkaller.appspot.com/bug?extid=b8c48ea38ca27d150063
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-f09079bd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ef68cb3d29a3/vmlinux-f09079bd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1cc9431b9a15/bzImage-f09079bd.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b8c48ea38ca27d150063@...kaller.appspotmail.com

------------[ cut here ]------------
RTNL: assertion failed at ./include/net/netdev_lock.h (72)
WARNING: CPU: 0 PID: 1141 at ./include/net/netdev_lock.h:72 netdev_ops_assert_locked include/net/netdev_lock.h:72 [inline]
WARNING: CPU: 0 PID: 1141 at ./include/net/netdev_lock.h:72 __linkwatch_sync_dev+0x1ed/0x230 net/core/link_watch.c:279
Modules linked in:
CPU: 0 UID: 0 PID: 1141 Comm: kworker/u32:5 Not tainted 6.16.0-rc1-syzkaller-00003-gf09079bd04a9 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: bond0 bond_mii_monitor
RIP: 0010:netdev_ops_assert_locked include/net/netdev_lock.h:72 [inline]
RIP: 0010:__linkwatch_sync_dev+0x1ed/0x230 net/core/link_watch.c:279
Code: 05 ff ff ff e8 64 d1 59 f8 c6 05 76 2e 2e 07 01 90 ba 48 00 00 00 48 c7 c6 c0 88 e3 8c 48 c7 c7 60 88 e3 8c e8 64 96 18 f8 90 <0f> 0b 90 90 e9 d6 fe ff ff 48 c7 c7 44 3e a8 90 e8 fe 8e c0 f8 e9
RSP: 0018:ffffc900064a79f0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880368fc000 RCX: ffffffff817ae368
RDX: ffff88802990a440 RSI: ffffffff817ae375 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 1ffff92000c94f48
R13: ffff8880368fccc5 R14: ffffffff8c5909c0 R15: ffffffff899b8950
FS:  0000000000000000(0000) GS:ffff8880d6754000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555560fdf808 CR3: 000000000e382000 CR4: 0000000000352ef0
DR0: 0000000010000007 DR1: 400000000000000c DR2: 0000000000000000
DR3: 0000000000000005 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ethtool_op_get_link+0x1d/0x70 net/ethtool/ioctl.c:63
 bond_check_dev_link+0x3f9/0x710 drivers/net/bonding/bond_main.c:863
 bond_miimon_inspect drivers/net/bonding/bond_main.c:2745 [inline]
 bond_mii_monitor+0x3c0/0x2dc0 drivers/net/bonding/bond_main.c:2967
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
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