------------[ cut here ]------------
WARNING: CPU: 2 PID: 1146 at net/xfrm/xfrm_state.c:3306 xfrm_state_fini+0x289/0x310 net/xfrm/xfrm_state.c:3306
Modules linked in:
CPU: 2 UID: 0 PID: 1146 Comm: kworker/u32:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:xfrm_state_fini+0x289/0x310 net/xfrm/xfrm_state.c:3306
Code: c1 f7 90 0f 0b 90 e9 e7 fe ff ff e8 01 7c c1 f7 90 0f 0b 90 e9 39 ff ff ff e8 f3 7b c1 f7 90 0f 0b 90 eb 8a e8 e8 7b c1 f7 90 <0f> 0b 90 e9 d5 fd ff ff e8 da 1a 2a f8 e9 f8 fd ff ff e8 00 1b 2a
RSP: 0018:ffffc900064bfa90 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802ce50000 RCX: fffff52000c97f23
RDX: ffff888029072480 RSI: ffffffff89fb6ce8 RDI: ffff888029072904
RBP: ffff88802ce514c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffc900064bfbd8
R13: dffffc0000000000 R14: fffffbfff20555e0 R15: ffffffff902aaee0
FS:  0000000000000000(0000) GS:ffff8880d6c08000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5617d135c0 CR3: 000000002665c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 xfrm_net_exit+0x2d/0x70 net/xfrm/xfrm_policy.c:4354
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:252
 cleanup_net+0x41b/0x8b0 net/core/net_namespace.c:695
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>