RootFS remains mounted after a commit

[dubrsl]

RootFS remains mounted after a commit

Docker version:- 0.7-RC4
OS: ALTLinux.org
Kernel: 3.10.16-std-def-alt1 #1 SMP x86_64 GNU/Linux

How to reproduce:

$ docker run -i -t centos /bin/bash
# yum update -y
# exit
$ docker commit <container_hash> centos-my

Logs:

[debug] api.go:973 Calling POST /commit
2013/10/24 10:31:03 POST /v1.6/commit?author=&comment=&container=2b989251535f&repo=centos-my&tag=
[debug] image.go:461 Mounting container 2b989251535faacda5c6a1be08af57d11577d039126d69fef1aff13b247b6675 at /var/lib/docker/containers/2b989251535faacda5c6a1be08af57d11577d039126d69fef1aff13b247b6675/rootfs for container
[debug] deviceset.go:202 activateDeviceIfNeeded(2b989251535faacda5c6a1be08af57d11577d039126d69fef1aff13b247b6675)
[debug] deviceset.go:202 activateDeviceIfNeeded(539c0211cd76cdeaedbecf9f023ef774612e331137ce7ebe4ae1b61088e7edbe)
[debug] deviceset.go:705 [devmapper] UnmountDevice(hash=539c0211cd76cdeaedbecf9f023ef774612e331137ce7ebe4ae1b61088e7edbe path=/var/lib/docker/containers/2b989251535faacda5c6a1be08af57d11577d039126d69fef1aff13b247b6675/rw)
[debug] deviceset.go:710 [devmapper] Unmount(/var/lib/docker/containers/2b989251535faacda5c6a1be08af57d11577d039126d69fef1aff13b247b6675/rw)
[debug] deviceset.go:715 [devmapper] Unmount done
[debug] deviceset.go:604 Waiting for unmount of docker-8:1-4849665-539c0211cd76cdeaedbecf9f023ef774612e331137ce7ebe4ae1b61088e7edbe: opencount=0
[debug] deviceset.go:534 [devmapper] deactivateDevice(539c0211cd76cdeaedbecf9f023ef774612e331137ce7ebe4ae1b61088e7edbe)
[debug] _cgo_gotypes.go:718 [devmapper] removeDevice START
[debug] _cgo_gotypes.go:722 [devmapper] removeDevice END
[debug] deviceset.go:564 [deviceset docker-8:1-4849665] waitRemove(539c0211cd76cdeaedbecf9f023ef774612e331137ce7ebe4ae1b61088e7edbe)
[debug] deviceset.go:578 Waiting for removal of docker-8:1-4849665-539c0211cd76cdeaedbecf9f023ef774612e331137ce7ebe4ae1b61088e7edbe: exists=0
[debug] deviceset.go:568 [deviceset docker-8:1-4849665] waitRemove END
%!(EXTRA string=539c0211cd76cdeaedbecf9f023ef774612e331137ce7ebe4ae1b61088e7edbe)[debug] deviceset.go:540 [devmapper] deactivateDevice END
[debug] deviceset.go:713 [devmapper] UnmountDevice END
[debug] image.go:92 Start untar layer
[debug] archive.go:173 [tar autodetect] n: 10
[debug] archive.go:178 Archive compression detected: tar
[debug] image.go:96 Untar time: 0.543708359s

Result:

$ mount | grep docker
/dev/mapper/docker-8:1-4849665-2b989251535faacda5c6a1be08af57d11577d039126d69fef1aff13b247b6675 on /var/lib/docker/containers/2b989251535faacda5c6a1be08af57d11577d039126d69fef1aff13b247b6675/rootfs type ext4 (rw,relatime,discard,stripe=16,data=ordered)

dmsetup ls | grep docker
docker-8:1-4849665-base (253:4)
docker-8:1-4849665-2b989251535faacda5c6a1be08af57d11577d039126d69fef1aff13b247b6675     (253:5)
docker-8:1-4849665-pool (253:3)

[dubrsl]

fixed in 0.7.0