------------[ cut here ]------------
WARNING: net/ipv6/xfrm6_tunnel.c:341 at xfrm6_tunnel_net_exit+0x7e/0x100, CPU#0: kworker/u8:1/13
Modules linked in:
CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 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: 68 67 d6 f7 4b 83 3c 2c 00 75 19 e8 ec cc 71 f7 49 81 fd f8 07 00 00 74 1d e8 de cc 71 f7 49 83 c5 08 eb c9 e8 d3 cc 71 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:ffffc90000107890 EFLAGS: 00010293
RAX: ffffffff8a4e111d RBX: ffff888110e04000 RCX: ffff88801ca90000
RDX: 0000000000000000 RSI: ffffffff8dbc41e9 RDI: ffff888110e04000
RBP: ffffc90000107990 R08: ffffffff8fc45d37 R09: 1ffffffff1f88ba6
R10: dffffc0000000000 R11: fffffbfff1f88ba7 R12: ffff888110e04000
R13: 0000000000000000 R14: ffff888109102480 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b83dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8dfa3d7dac CR3: 00000001068e4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ops_undo_list+0x49a/0x990
 cleanup_net+0x4d8/0x810
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
