------------[ cut here ]------------
WARNING: CPU: 2 PID: 11 at net/core/dev.c:10876 unregister_netdevice_many_notify+0x14d8/0x19a0 net/core/dev.c:10876
Modules linked in:
CPU: 2 PID: 11 Comm: kworker/u16:0 Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:unregister_netdevice_many_notify+0x14d8/0x19a0 net/core/dev.c:10876
Code: b4 1a 00 00 48 c7 c6 e0 34 81 8b 48 c7 c7 20 35 81 8b c6 05 1e 12 6c 06 01 e8 24 08 23 f9 0f 0b e9 64 f7 ff ff e8 d8 45 5c f9 <0f> 0b e9 3b f7 ff ff e8 ac 52 b0 f9 e9 fc ec ff ff 4c 89 e7 e8 ff
RSP: 0018:ffffc900003d7a30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000075785c01 RCX: 0000000000000000
RDX: ffff888013ac2400 RSI: ffffffff8829c2c8 RDI: 0000000000000001
RBP: ffff8880546ec000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000004e R12: ffff888043704c00
R13: 0000000000000000 R14: 0000000000000002 R15: ffff888043704c00
FS:  0000000000000000(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b0d03a17f8 CR3: 0000000026308000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip6_tnl_exit_batch_net+0x57d/0x6f0 net/ipv6/ip6_tunnel.c:2278
 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175
 cleanup_net+0x505/0xb20 net/core/net_namespace.c:614
 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600
 worker_thread+0x687/0x1110 kernel/workqueue.c:2751
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>