Use -v to map directories into the container, and use df-h to view disk mounts，show wrong infomation

[xuegege5290]

Description

When i use -v to map directories into the container, and use df-h to view disk mounts，show wrong infomation

$ docker run -itd --name t8 -v ~/docker:/home/sx/: -v ~/go:/home/go/ busybox:latest /bin/sh
d0fed1a003ef1dc12bd57d39772aa5869087b809259128bcf55851ef4ca0c70a

$ docker exec -it t8 /bin/sh                                                               
/ # 
/ # df -h /home/sx
Filesystem                Size      Used Available Use% Mounted on
/dev/mapper/data-home
                        290.4G    217.2G     58.4G  79% /home/sx
/ # df -h /home/go
Filesystem                Size      Used Available Use% Mounted on
/dev/mapper/data-home
                        290.4G    217.2G     58.4G  79% /home/sx

When i container ,use the df -h /home/go,but it show the wrong infomation!

But when i use the another images ,such as centos:8,it show the right mount infomation...

$ docker run -itd --name t8 -v ~/docker:/home/sx/: -v ~/go:/home/go/ centos:8 /bin/sh      
0ee1433ab9cd908648af6929b295165c8dd934e2bfd3db03c4c4ddb9dcdfa7cb

$ docker exec -it t8 /bin/sh                                                         
sh-4.4# df -h /home/sx
Filesystem             Size  Used Avail Use% Mounted on
/dev/mapper/data-home  291G  218G   59G  79% /home/sx
sh-4.4# df -h /home/go
Filesystem             Size  Used Avail Use% Mounted on
/dev/mapper/data-home  291G  218G   59G  79% /home/go

Reproduce

$ docker run -itd --name t8 -v ~/docker:/home/sx/: -v ~/go:/home/go/ busybox:latest /bin/sh
d0fed1a003ef1dc12bd57d39772aa5869087b809259128bcf55851ef4ca0c70a

$ docker exec -it t8 /bin/sh                                                               
/ # 
/ # df -h /home/sx
Filesystem                Size      Used Available Use% Mounted on
/dev/mapper/data-home
                        290.4G    217.2G     58.4G  79% /home/sx
/ # df -h /home/go
Filesystem                Size      Used Available Use% Mounted on
/dev/mapper/data-home
                        290.4G    217.2G     58.4G  79% /home/sx

Expected behavior

it should be like this :
1.

$ docker run -itd --name t8 -v ~/docker:/home/sx/: -v ~/go:/home/go/ centos:8 /bin/sh      
0ee1433ab9cd908648af6929b295165c8dd934e2bfd3db03c4c4ddb9dcdfa7cb

$ docker exec -it t8 /bin/sh                                                         
sh-4.4# df -h /home/sx
Filesystem             Size  Used Avail Use% Mounted on
/dev/mapper/data-home  291G  218G   59G  79% /home/sx
sh-4.4# df -h /home/go
Filesystem             Size  Used Avail Use% Mounted on
/dev/mapper/data-home  291G  218G   59G  79% /home/go

docker version

$ docker version            
Client: Docker Engine - Community
 Version:           20.10.17
 API version:       1.41
 Go version:        go1.17.11
 Git commit:        100c701
 Built:             Mon Jun  6 23:03:11 2022
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.17
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.17.11
  Git commit:       a89b842
  Built:            Mon Jun  6 23:01:29 2022
  OS/Arch:          linux/amd64
  Experimental:     true
 containerd:
  Version:          1.5.9
  GitCommit:        3326bf27cc876c94597d8ede2b9a820e4e9ccff6
 runc:
  Version:          1.0.3
  GitCommit:        v1.0.0-rc93-500-gf46b6ba
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

$ docker info      
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Docker Buildx (Docker Inc., v0.8.2-docker)
  compose: Docker Compose (Docker Inc., v2.6.0)

Server:
 Containers: 1
  Running: 1
  Paused: 0
  Stopped: 0
 Images: 40
 Server Version: 20.10.17
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 3326bf27cc876c94597d8ede2b9a820e4e9ccff6
 runc version: v1.0.0-rc93-500-gf46b6ba
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 4.19.112-2.el8.x86_64

Additional Info

No response

[xuegege5290]

@thaJeztah

[thaJeztah]

Looks like this may be a bug in busybox?

[xuegege5290]

Thanks for your quick replay！yes， i already verify it is busybox problem.In busybox image, it seems like the df binary has some problem.

[thaJeztah]

closing in favour of mirror/busybox#71, but happy to reopen if it turns out there's things to address on our side.