I can confirm this issue.
output of df -h:

Filesystem                       Size  Used Avail Use% Mounted on
udev                             978M  4.0K  978M   1% /dev
tmpfs                            196M  760K  196M   1% /run
/dev/disk/by-partlabel/userdata   13G  2.5G  9.8G  20% /userdata
/dev/loop0                       2.0G  2.0G     0 100% /
/dev/loop1                       243M  231M  6.5M  98% /android/system
none                             4.0K     0  4.0K   0% /android
tmpfs                            980M  4.0K  980M   1% /etc/fstab
tmpfs                            980M  2.0M  978M   1% /var/lib/lxc/android/rootfs
/dev/disk/by-partlabel/system    1.5G  2.4M  1.5G   1% /android/cache
/dev/disk/by-partlabel/protect1  5.9M   44K  5.6M   1% /android/protect_f
/dev/disk/by-partlabel/protect2  5.9M   44K  5.6M   1% /android/protect_s
none                             4.0K     0  4.0K   0% /sys/fs/cgroup
tmpfs                            980M   16K  980M   1% /tmp
none                             5.0M     0  5.0M   0% /run/lock
none                             980M   83M  898M   9% /run/shm
none                             100M     0  100M   0% /run/user
cgmfs                            100K     0  100K   0% /run/cgmanager/fs
tmpfs                            980M     0  980M   0% /media
tmpfs                            980M     0  980M   0% /var/lib/openvpn/chroot/tmp
tmpfs                            980M     0  980M   0% /var/lib/sudo
tmpfs                            196M   40K  196M   1% /run/user/32011
tmpfs                            196M     0  196M   0% /run/user/0

The problem seems to have to do with / and /dev/loop0 but I don't know how to advance from here. Any hint is appreciated.
And thanks for all the time and effort you put into this!