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WARNING: CPU: 1 PID: 5055 at net/xfrm/xfrm_state.c:2352 xfrm_state_fini+0x1e5/0x250 net/xfrm/xfrm_state.c:2352
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 5055 Comm: kworker/u4:15 Not tainted 4.14.142+ #0
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xca/0x134 lib/dump_stack.c:53
 panic+0x1ea/0x3d3 kernel/panic.c:182
 __warn.cold+0x2f/0x3a kernel/panic.c:546
 report_bug+0x20a/0x248 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bf/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x18/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:xfrm_state_fini+0x1e5/0x250 net/xfrm/xfrm_state.c:2352
RSP: 0018:ffff88819c617c00 EFLAGS: 00010297
RAX: ffff88819c662f00 RBX: ffff88819c239d80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88819c663780 RDI: 0000000000000001
RBP: ffff88819c23b4c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88819c617ce8
R13: ffffffff8adfc758 R14: dffffc0000000000 R15: fffffbfff15bf8eb
 ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:142
 cleanup_net+0x3ce/0x870 net/core/net_namespace.c:484
 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134
 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271
 kthread+0x31f/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404
Kernel Offset: 0x7600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..