gitlab-ce docker container：Unable to execute command via ' docker exec gitlab-container ls '.

Summary

The container cannot be manipulated by "Docker exec" after the Gitlab Docker container has been running for about 1 months. Other containers on the server can be executed normally. The Gitlab works correctly, but it cannot be modified.

Steps to reproduce

No attempt to reproduce.

What is the current bug behavior?

Gitlab containers cannot be maintained by "Docker exec".

What is the expected correct behavior?

The Gitlab container can be maintained normally using "Docker exec".

Relevant logs and/or screenshots

Just docker log： docker.log

Results of GitLab environment info

docker info：

Containers: 1
 Running: 1
 Paused: 0
 Stopped: 0
Images: 29
Server Version: 17.12.0-ce
Storage Driver: aufs
 Root Dir: /opt/lib/docker/aufs
 Backing Filesystem: xfs
 Dirs: 214
 Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 89623f28b87a6004d4b785663257362d1658a729
runc version: b2567b37d7b75eb4cf325b77297b140ea686ce8f
init version: 949e6fa
Security Options:
 apparmor
 seccomp
  Profile: default
Kernel Version: 4.4.0-62-generic
Operating System: Ubuntu 16.04.2 LTS
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 7.796GiB
Name: git.cqrd.com
ID: SC55:OWCD:2AR5:ZQUA:IZ3L:U6HT:MRBW:WOYE:HGOQ:JSZE:OGCX:CK5S
Docker Root Dir: /opt/lib/docker
Debug Mode (client): false
Debug Mode (server): false
HTTP Proxy: http://172.17.18.80:8080
HTTPS Proxy: http://172.17.18.80:8080
No Proxy: .x,hub.com,h.com,.cae.com
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
 h.com
 hub.com
 hub.x
 127.0.0.0/8
Registry Mirrors:
 https://mirror.cae.com/
Live Restore Enabled: true

WARNING: No swap limit support

docker version:

Client:
 Version:	17.12.0-ce
 API version:	1.35
 Go version:	go1.9.2
 Git commit:	c97c6d6
 Built:	Wed Dec 27 20:11:19 2017
 OS/Arch:	linux/amd64

Server:
 Engine:
  Version:	17.12.0-ce
  API version:	1.35 (minimum version 1.12)
  Go version:	go1.9.2
  Git commit:	c97c6d6
  Built:	Wed Dec 27 20:09:53 2017
  OS/Arch:	linux/amd64
  Experimental:	false

docker service status:

● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/docker.service.d
           └─proxy.conf
   Active: active (running) since Fri 2018-07-06 18:26:42 CST; 2 months 6 days ago
     Docs: https://docs.docker.com
 Main PID: 1207 (dockerd)
    Tasks: 63
   Memory: 666.4M
      CPU: 12h 42min 45.760s
   CGroup: /system.slice/docker.service
           ├─1207 /usr/bin/dockerd -H fd://
           ├─1319 docker-containerd --config /var/run/docker/containerd/containerd.toml
           ├─2720 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 443 -container-ip 172.172.172.2 -container-port 443
           ├─2744 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 80 -container-ip 172.172.172.2 -container-port 80
           ├─2762 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 22 -container-ip 172.172.172.2 -container-port 22
           └─2772 docker-containerd-shim -namespace moby -workdir /opt/lib/docker/containerd/daemon/io.containerd.runtime.v1.linux/moby/52b11c202caebc

server info

Linux git.cqrd.com 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

gitlab version:GitLab Community Edition 11.0.0

gitlab container status：

52b11c202cae        gitlab/gitlab-ce:11.0.0-ce.0   "/assets/wrapper"   7 weeks ago         Up 7 weeks (healthy)   0.0.0.0:22->22/tcp, 0.0.0.0:80->80/tcp, 0.0.0.0:443->443/tcp   gitlab