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WARNING: CPU: 1 PID: 2065 at net/xfrm/xfrm_state.c:2197 xfrm_state_fini+0x2a0/0x340 net/xfrm/xfrm_state.c:2197
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 2065 Comm: kworker/u4:2 Not tainted 4.9.147+ #86
Workqueue: netns cleanup_net
 ffff8801cef37940 ffffffff81b43be9 ffffffff82a39060 00000000ffffffff
 ffffffff82cb8900 0000000000000001 0000000000000009 ffff8801cef37a00
 ffffffff813f7745 0000000041b58ab3 ffffffff82e2ac3b ffffffff813f7586
Call Trace:
 [<ffffffff81b43be9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b43be9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f7745>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f7982>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
 [<ffffffff810dc0bc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff8265ad20>] xfrm_state_fini+0x2a0/0x340 net/xfrm/xfrm_state.c:2197
 [<ffffffff8263c14d>] xfrm_net_exit+0x2d/0x30 net/xfrm/xfrm_policy.c:3119
 [<ffffffff822e5f50>] ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:136
 [<ffffffff822e8cb2>] cleanup_net+0x3f2/0x8b0 net/core/net_namespace.c:473
 [<ffffffff81131081>] process_one_work+0x831/0x15f0 kernel/workqueue.c:2092
 [<ffffffff81131f16>] worker_thread+0xd6/0x1140 kernel/workqueue.c:2226
 [<ffffffff81142cbd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8281a69c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Kernel Offset: disabled
Rebooting in 86400 seconds..