------------[ cut here ]------------
WARNING: CPU: 1 PID: 24603 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: 1 PID: 24603 Comm: kworker/u4:38 Not tainted 4.9.170+ #48
Workqueue: netns cleanup_net
 ffff8801a6ccf8e8 ffffffff81b4fb21 0000000000000000 ffffffff82a39ba0
 00000000ffffffff 0000000000000001 0000000000000009 ffff8801a6ccf9c8
 ffffffff813f966a 0000000041b58ab3 ffffffff82e2ef22 ffffffff813f9491
Call Trace:
 [<0000000089a8d261>] __dump_stack lib/dump_stack.c:15 [inline]
 [<0000000089a8d261>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<0000000043ee9dd0>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<00000000492297d7>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<000000003ba4b7d5>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589
 [<000000007b4c6f16>] xfrm_policy_fini+0x28b/0x320 net/xfrm/xfrm_policy.c:3060
 [<0000000035f30edd>] xfrm_net_exit+0x26/0x40 net/xfrm/xfrm_policy.c:3121
 [<00000000f44cb8e7>] ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:136
 [<000000007a36f5c6>] cleanup_net+0x3d6/0x8a0 net/core/net_namespace.c:474
 [<00000000b4d2011f>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114
 [<0000000058daa062>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251
 [<00000000a59f902c>] kthread+0x278/0x310 kernel/kthread.c:211
 [<000000002089208e>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Kernel Offset: disabled
Rebooting in 86400 seconds..