syzbot has bisected this issue to:

commit 04efcee6ef8d0f01eef495db047e7216d6e6e38f
Author: Stanislav Fomichev [off-list ref]
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@syzkaller.appspotmail.com
Fixes: 04efcee6ef8d ("net: hold instance lock during NETDEV_CHANGE")

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