------------[ cut here ]------------
WARNING: CPU: 1 PID: 12 at net/core/dev.c:10961 unregister_netdevice_many_notify+0x1554/0x1a20 net/core/dev.c:10961
Modules linked in:
CPU: 1 PID: 12 Comm: kworker/u4:1 Not tainted 6.5.0-rc5-syzkaller-01636-gc2e5f4fd1148 #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+0x1554/0x1a20 net/core/dev.c:10961
Code: f4 1a 00 00 48 c7 c6 60 69 81 8b 48 c7 c7 a0 69 81 8b c6 05 20 b0 6a 06 01 e8 48 14 21 f9 0f 0b e9 1c f7 ff ff e8 fc 51 5a f9 <0f> 0b e9 f3 f6 ff ff e8 60 36 af f9 e9 80 ec ff ff 4c 89 e7 e8 b3
RSP: 0018:ffffc90000117a28 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 000000002940d601 RCX: 0000000000000000
RDX: ffff88801664d940 RSI: ffffffff882bce94 RDI: 0000000000000001
RBP: ffff888048632000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000004e R12: ffff888026a4b000
R13: 0000000000000000 R14: 0000000000000002 R15: ffff888026a4b000
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffffe13b178 CR3: 000000004c0f6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip_tunnel_delete_nets+0x2bb/0x3a0 net/ipv4/ip_tunnel.c:1144
 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>