------------[ cut here ]------------
WARNING: net/ipv6/xfrm6_tunnel.c:341 at xfrm6_tunnel_net_exit+0x7e/0x100, CPU#0: kworker/u8:3/5875
Modules linked in:
CPU: 0 UID: 0 PID: 5875 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: c8 04 d6 f7 4b 83 3c 2c 00 75 19 e8 ac d2 70 f7 49 81 fd f8 07 00 00 74 1d e8 9e d2 70 f7 49 83 c5 08 eb c9 e8 93 d2 70 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:ffffc900036c7890 EFLAGS: 00010293
RAX: ffffffff8a4f7f1d RBX: ffff8881058e4000 RCX: ffff888023ae3a00
RDX: 0000000000000000 RSI: ffffffff8db9af17 RDI: ffff8881058e4000
RBP: ffffc900036c7990 R08: ffffffff8fc30877 R09: 1ffffffff1f8610e
R10: dffffc0000000000 R11: fffffbfff1f8610f R12: ffff8881058e4000
R13: 0000000000000000 R14: ffff88810e5823c0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b840a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000fff3 CR3: 000000010e596000 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>
