------------[ cut here ]------------
WARNING: CPU: 0 PID: 64 at net/xfrm/xfrm_state.c:2358 xfrm_state_fini+0x1e5/0x250 net/xfrm/xfrm_state.c:2358
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 64 Comm: kworker/u4:1 Not tainted 4.14.109+ #46
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x10e lib/dump_stack.c:53
 panic+0x1d9/0x3c2 kernel/panic.c:182
 __warn.cold+0x2f/0x3b kernel/panic.c:546
Kernel Offset: 0x21e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..