------------[ cut here ]------------
WARNING: CPU: 1 PID: 12 at net/core/dev.c:10876 unregister_netdevice_many_notify+0x13bc/0x1890
Modules linked in:
CPU: 1 PID: 12 Comm: kworker/u4:1 Not tainted 6.5.0-rc5-syzkaller-00182-g25aa0bebba72 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: netns cleanup_net
RIP: 0010:unregister_netdevice_many_notify+0x13bc/0x1890 net/core/dev.c:10876
Code: fa de 3a f9 48 8b 4c 24 28 48 8b 09 4c 39 f1 0f 84 18 01 00 00 48 89 cb e8 91 10 e2 f8 48 89 d9 e9 8f f5 ff ff e8 84 10 e2 f8 <0f> 0b e9 4b ff ff ff e8 78 10 e2 f8 0f 0b eb 9b e8 6f 10 e2 f8 c6
RSP: 0018:ffffc90000117880 EFLAGS: 00010293
RAX: ffffffff88a9a79c RBX: ffff88802a3b40a0 RCX: ffff888016255940
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000117a50 R08: ffffffff88a9a6a1 R09: 1ffffffff1c97684
R10: dffffc0000000000 R11: fffffbfff1c97685 R12: ffff88802a3b4000
R13: ffff88802a5ecc90 R14: ffffc90000117ac0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f67d6d458e5 CR3: 000000000d130000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip6_tnl_exit_batch_net+0x596/0x5e0 net/ipv6/ip6_tunnel.c:2278
 ops_exit_list net/core/net_namespace.c:175 [inline]
 cleanup_net+0x767/0xb80 net/core/net_namespace.c:614
 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2600
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2751
 kthread+0x2b8/0x350 kernel/kthread.c:389
 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>