------------[ cut here ]------------
WARNING: CPU: 1 PID: 5868 at net/ipv6/xfrm6_tunnel.c:341 xfrm6_tunnel_net_exit+0x7e/0x100
Modules linked in:

CPU: 1 UID: 0 PID: 5868 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full) 
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:xfrm6_tunnel_net_exit+0x7e/0x100
Code: 98 44 21 f8 4b 83 3c 2c 00 75 19 e8 7c 9a bc f7 49 81 fd f8 07 00 00 74 1d e8 6e 9a bc f7 49 83 c5 08 eb c9 e8 63 9a bc f7 90 <0f> 0b 90 49 81 fd f8 07 00 00 75 e3 48 81 c3 00 08 00 00 45 31 f6
RSP: 0000:ffffc900045cf8b0 EFLAGS: 00010293
RAX: ffffffff8a01db7d RBX: ffff888030fd4000 RCX: ffff8881065ed700
RDX: 0000000000000000 RSI: ffffffff8d71ebcb RDI: ffff888030fd4448
RBP: ffffc900045cf9b0 R08: ffffffff8f5cd537 R09: 1ffffffff1eb9aa6
R10: dffffc0000000000 R11: fffffbfff1eb9aa7 R12: ffff888030fd4000
R13: 0000000000000448 R14: ffff88803abaa480 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881a4173000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f281adf4fc8 CR3: 0000000105f4e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 ops_undo_list+0x49a/0x990
 cleanup_net+0x4d8/0x820
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
