netdev - Re: [syzbot] [net?] WARNING in __linkwatch_sync

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Message-ID: <688e282f.050a0220.81582.0000.GAE@google.com>
Date: Sat, 02 Aug 2025 08:01:03 -0700
From: syzbot <syzbot+b8c48ea38ca27d150063@...kaller.appspotmail.com>
To: andrew@...n.ch, cratiu@...dia.com, davem@...emloft.net, 
	edumazet@...gle.com, horms@...nel.org, jv@...sburgh.net, kuba@...nel.org, 
	kuni1840@...il.com, kuniyu@...zon.com, kuniyu@...gle.com, 
	linux-kernel@...r.kernel.org, liuhangbin@...il.com, netdev@...r.kernel.org, 
	pabeni@...hat.com, sdf@...ichev.me, stfomichev@...il.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING in __linkwatch_sync_dev (2)

syzbot has bisected this issue to:

commit 04efcee6ef8d0f01eef495db047e7216d6e6e38f
Author: Stanislav Fomichev <sdf@...ichev.me>
Date:   Fri Apr 4 16:11:22 2025 +0000

    net: hold instance lock during NETDEV_CHANGE

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13eb22a2580000
start commit:   afd8c2c9e2e2 Merge branch 'ipv6-f6i-fib6_siblings-and-rt-f..
git tree:       net
final oops:     https://syzkaller.appspot.com/x/report.txt?x=101b22a2580000
console output: https://syzkaller.appspot.com/x/log.txt?x=17eb22a2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a4bcc0a11b3192be
dashboard link: https://syzkaller.appspot.com/bug?extid=b8c48ea38ca27d150063
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11fa74a2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=117731bc580000

Reported-by: syzbot+b8c48ea38ca27d150063@...kaller.appspotmail.com
Fixes: 04efcee6ef8d ("net: hold instance lock during NETDEV_CHANGE")

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