------------[ cut here ]------------
WARNING: CPU: 0 PID: 25136 at net/xfrm/xfrm_policy.c:3060 xfrm_policy_fini+0x28b/0x320 net/xfrm/xfrm_policy.c:3060
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 25136 Comm: kworker/u4:22 Not tainted 4.9.168+ #39
Workqueue: netns cleanup_net
 ffff8801908cf8e8 ffffffff81b4f5d1 0000000000000000 ffffffff82a39ba0
 00000000ffffffff 0000000000000000 0000000000000009 ffff8801908cf9c8
 ffffffff813f945a 0000000041b58ab3 ffffffff82e2ec5a ffffffff813f9281
Call Trace:
 [<00000000c134ecbd>] __dump_stack lib/dump_stack.c:15 [inline]
 [<00000000c134ecbd>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<000000003591388e>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<0000000089081431>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<00000000905c7ce3>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589
 [<000000000bed79be>] xfrm_policy_fini+0x28b/0x320 net/xfrm/xfrm_policy.c:3060
 [<00000000515c86ce>] xfrm_net_exit+0x26/0x40 net/xfrm/xfrm_policy.c:3121
 [<00000000dec79e07>] ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:136
 [<00000000ea24038c>] cleanup_net+0x3d6/0x8a0 net/core/net_namespace.c:473
 [<0000000007630171>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114
 [<00000000a6ade544>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251
 [<000000005fb3a487>] kthread+0x278/0x310 kernel/kthread.c:211
 [<0000000046a9bd8b>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Kernel Offset: disabled
Rebooting in 86400 seconds..