------------[ cut here ]------------
WARNING: CPU: 3 PID: 1151 at net/xfrm/xfrm_state.c:3303 xfrm_state_fini+0x289/0x310 net/xfrm/xfrm_state.c:3303
Modules linked in:
CPU: 3 UID: 0 PID: 1151 Comm: kworker/u32:9 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:3303
Code: 8a f7 90 0f 0b 90 e9 e7 fe ff ff e8 11 bc 8a f7 90 0f 0b 90 e9 39 ff ff ff e8 03 bc 8a f7 90 0f 0b 90 eb 8a e8 f8 bb 8a f7 90 <0f> 0b 90 e9 d5 fd ff ff e8 fa 22 f0 f7 e9 f8 fd ff ff e8 20 23 f0
RSP: 0018:ffffc90006f6faa0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88804fdc8000 RCX: fffff52000dedf25
RDX: ffff8880276c2440 RSI: ffffffff8a304f78 RDI: ffff8880276c2884
RBP: ffff88804fdc9480 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90006f6fbe8
R13: dffffc0000000000 R14: fffffbfff20a8d68 R15: ffffffff90546b20
FS:  0000000000000000(0000) GS:ffff8880977ba000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080202018 CR3: 0000000027f3f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 xfrm_net_exit+0x2d/0x70 net/xfrm/xfrm_policy.c:4348
 ops_exit_list net/core/net_namespace.c:198 [inline]
 ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:251
 cleanup_net+0x408/0x890 net/core/net_namespace.c:682
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>