------------[ cut here ]------------
WARNING: net/ipv6/xfrm6_tunnel.c:341 at xfrm6_tunnel_net_exit+0x7e/0x100, CPU#1: kworker/u8:3/5872
Modules linked in:
CPU: 1 UID: 0 PID: 5872 Comm: kworker/u8:3 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: 78 e8 d8 f7 4b 83 3c 2c 00 75 19 e8 cc e9 74 f7 49 81 fd f8 07 00 00 74 1d e8 be e9 74 f7 49 83 c5 08 eb c9 e8 b3 e9 74 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: 0018:ffffc90003bc7890 EFLAGS: 00010293
RAX: ffffffff8a4ac0cd RBX: ffff88802b870000 RCX: ffff88801f2b1d00
RDX: 0000000000000000 RSI: ffffffff8dbbaecf RDI: ffff88802b870000
RBP: ffffc90003bc7990 R08: ffffffff8fc3c637 R09: 1ffffffff1f878c6
R10: dffffc0000000000 R11: fffffbfff1f878c7 R12: ffff88802b870000
R13: 0000000000000000 R14: ffff8880247b8000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881a39f1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5c1b6d4440 CR3: 0000000029c04000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ops_undo_list+0x49a/0x990
 cleanup_net+0x4c5/0x800
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x47f/0x820
 ret_from_fork_asm+0x1a/0x30
 </TASK>
