------------[ cut here ]------------
WARNING: CPU: 1 PID: 5648 at net/ipv6/xfrm6_tunnel.c:341 xfrm6_tunnel_net_exit+0x7e/0x100
Modules linked in:
CPU: 1 UID: 0 PID: 5648 Comm: kworker/u8:2 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 1b 17 f8 4b 83 3c 2c 00 75 19 e8 fc 12 b1 f7 49 81 fd f8 07 00 00 74 1d e8 ee 12 b1 f7 49 83 c5 08 eb c9 e8 e3 12 b1 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:ffffc90003a2f890 EFLAGS: 00010293
RAX: ffffffff8a0f067d RBX: ffff888113b20000 RCX: ffff888103719d00
RDX: 0000000000000000 RSI: ffffffff8d70ec5a RDI: ffff888113b20000
RBP: ffffc90003a2f990 R08: ffffffff8f7cf877 R09: 1ffffffff1ef9f0e
R10: dffffc0000000000 R11: fffffbfff1ef9f0f R12: ffff888113b20000
R13: 0000000000000000 R14: ffff88810a77a480 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8882a9f36000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005634282b3950 CR3: 00000001ba4b6000 CR4: 00000000000006f0
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+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
