Comment 2 for bug 1587065

I have a related Problem with a libvirt Guest running some Docker-Containers.

root@docker1:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 7.9G 2.9G 4.6G 39% /
udev 10M 0 10M 0% /dev
tmpfs 794M 8.6M 785M 2% /run
tmpfs 2.0G 672K 2.0G 1% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
none 7.9G 2.9G 4.6G 39% /var/lib/docker/aufs/mnt/8b510e9eb71523cf9afc723e11831a169c822b7251049f95ebed5e978b22184b
shm 64M 0 64M 0% /var/lib/docker/containers/3d5542423739bc1a4467ce5e15a3b82224d2d1b315af75d7d91a0cc04e1e7b07/shm
none 7.9G 2.9G 4.6G 39% /var/lib/docker/aufs/mnt/5d186a68a1fca2b58a440e6dbdf293853011a9526b819ac1dbcba7f91272535f
shm 64M 0 64M 0% /var/lib/docker/containers/a4355f5e2a66b25a564c5027f818b4385cd417f85d8aaf79700ca4086fb86e63/shm
none 7.9G 2.9G 4.6G 39% /var/lib/docker/aufs/mnt/e972052c347006cd8c79dc5bf9aaba07fdba2edeadc01e18e903d04ca4b05a86
none 7.9G 2.9G 4.6G 39% /var/lib/docker/aufs/mnt/e22995e962919ea50fcf7b4a5e52916e6839f76708d22e57e81de687af2f0dd0
shm 64M 0 64M 0% /var/lib/docker/containers/00e3490e37ded90e7421eb19e650cc684dec2b65a848a203c21212a549bf9e0e/shm
shm 64M 0 64M 0% /var/lib/docker/containers/631b37644a0ac106b7d7403c2fcc3760d4647cb96141915b0aa7ae78f98e4e05/shm
root@docker1:~# mount -l | grep /dev/vda2
root@docker1:~# mount -l | grep /dev/sda
/dev/sda1 on / type ext4 (rw,relatime,discard,errors=remount-ro,data=ordered)
/dev/sda1 on /var/lib/docker/aufs type ext4 (rw,relatime,discard,errors=remount-ro,data=ordered)

I am not able to take snapshots:

error: internal error: unable to execute QEMU agent command 'guest-fsfreeze-freeze': failed to freeze /: Device or resource busy

Thank you
Tim