Created attachment 641721 [details]
output of virt-builder fedora-22 --install mc --format qcow2 --verbose

When trying to create fedor img with virt-builder on opensuse-TW, following
occurs:
# virt-builder fedora-22 --install mc --format qcow2 --verbose
...
[ 135.0] Finishing off
libguestfs: trace: umount_all
libguestfs: trace: umount_all = -1 (error)
virt-builder: Guestfs.Error("debug: Cannot stat /sysroot: Connection timed
out\nCannot stat file /proc/1/fd/0: Connection timed out\nCannot stat file
/proc/1/fd/1: Connection timed out\nCannot stat file /proc/1/fd/2: Connection
timed out\nCannot stat file /proc/1/fd/255: Connection timed out\nCannot stat
file /proc/91/fd/0: Connection timed out\nCannot stat file /proc/91/fd/1:
Connection timed out\nCannot stat file /proc/91/fd/2: Connection timed
out\nCannot stat file /proc/91/fd/3: Connection timed out\nCannot stat file
/proc/91/fd/4: Connection timed out\nCannot stat file /proc/91/fd/5: Connection
timed out\nCannot stat file /proc/91/fd/6: Connection timed out\nCannot stat
file /proc/91/fd/7: Connection timed out\nCannot stat file /proc/91/fd/8:
Connection timed out\nCannot stat file /proc/91/fd/9: Connection timed
out\nCannot stat file /proc/160/fd/0: Connection timed out\nCannot stat file
/proc/160/fd/1: Connection timed out\nCannot stat file /proc/160/fd/2:
Connection timed out\nCannot stat file /proc/160/fd/3: Connection timed
out\nCannot stat file /proc/160/fd/4: Connection timed out\nCannot stat file
/proc/160/fd/6: Connection timed out\nCannot stat file /proc/241/fd/0:
Connection timed out\nCannot stat file /proc/241/fd/1: Connection timed
out\nCannot stat file /proc/241/fd/2: Connection timed out\nCannot stat file
/proc/241/fd/3: Connection timed out") (ignored)
virt-builder: libguestfs error: umount_all: umount: /sysroot/dev: umount:
/sysroot/dev: target is busy
        (In some cases useful info about processes that
         use the device is found by lsof(8) or fuser(1).)
libguestfs: trace: close
libguestfs: trace: internal_autosync
libguestfs: trace: internal_autosync = -1 (error)