CRIU checkpoint失败：Cannot checkpoint container

Question

测试的环境及步骤如下：

[root ~]# lsb_release -a
LSB Version:	:core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID:	CentOS
Description:	CentOS Linux release 7.9.2009 (Core)
Release:	7.9.2009
Codename:	Core
[root ~]# uname -a
Linux agent6 5.3.18-3-xvp #1 SMP XVP 5.3.18-3 (Sat, 18 Apr 2020 19:18:14 +0800) x86_64 x86_64 x86_64 GNU/Linux
[root ~]# docker version
Client: Docker Engine - Community
 Version:           19.03.9
 API version:       1.40
 Go version:        go1.13.10
 Git commit:        9d988398e7
 Built:             Fri May 15 00:25:27 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.8
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.12.17
  Git commit:       afacb8b
  Built:            Wed Mar 11 01:25:42 2020
  OS/Arch:          linux/amd64
  Experimental:     true
 containerd:
  Version:          1.2.13
  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683
[root ~]# criu -V

Version: 3.15
GitID: v3.14-333-gd49ace9

[root ~]# criu check
Looks good.

[root ~]# criu check --all
Warn  (criu/cr-check.c:1230): clone3() with set_tid not supported
Error (criu/cr-check.c:1272): Time namespaces are not supported
Looks good but some kernel features are missing
which, depending on your process tree, may cause
dump or restore failure.
[root ~]# cat /etc/docker/daemon.json
{
	"insecure-registry":["192.168.10.17:443"],
	"registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"] ,
	"experimental": true

}

[root ~]# docker run -d --name track --security-opt seccomp:unconfined busybox /bin/sh -c 'i=0; while true; do echo $i;  i=$(expr "$i"  + 1);  sleep 1;  done'
12fe0d9dfcacd222543a9f7ca838560a1277a748b00496442d0c55aa319d05a0
[root ~]# docker checkpoint create track checkpoint-track
Error response from daemon: Cannot checkpoint container track: runc did not terminate sucessfully: criu failed: type NOTIFY errno 0 path= /run/containerd/io.containerd.runtime.v1.linux/moby/12fe0d9dfcacd222543a9f7ca838560a1277a748b00496442d0c55aa319d05a0/criu-dump.log: unknown

其中，criu check --all的时候有一个错误，但是在我的另一台电脑上（3.10内核）也出现了这个错误，但是并没有影响后面的checkpoint。请诸位大佬指教一下，在这个bug卡了好久了。

部署容器的例子是参考的CRIU官方的例子：https://criu.org/Docker