IPVS: Creating netns size=2536 id=6
IPVS: Creating netns size=2536 id=7
IPVS: Creating netns size=2536 id=8
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1634 at net/xfrm/xfrm_state.c:2175 xfrm_state_fini+0x2a0/0x340 net/xfrm/xfrm_state.c:2175
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 1634 Comm: kworker/u4:3 Not tainted 4.9.116-g52be322 #17
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
 ffff8801cf4e7950 ffffffff81eb46a9 ffffffff83c48980 00000000ffffffff
 0000000000000000 0000000000000000 000000000000087f ffff8801cf4e7a10
 ffffffff81421a75 0000000041b58ab3 ffffffff843bbff8 ffffffff814218b6
Call Trace:
 [<ffffffff81eb46a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb46a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81421a75>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff81421d61>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff8113683c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff83519cd0>] xfrm_state_fini+0x2a0/0x340 net/xfrm/xfrm_state.c:2175
 [<ffffffff834f6c7d>] xfrm_net_exit+0x2d/0x30 net/xfrm/xfrm_policy.c:3066
 [<ffffffff8305adc0>] ops_exit_list.isra.6+0xb0/0x160 net/core/net_namespace.c:136
 [<ffffffff8305dc91>] cleanup_net+0x321/0x630 net/core/net_namespace.c:473
 [<ffffffff8118d181>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff8118df76>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fbddc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..