[Kestrelhpc-developers] Creating image cache ended with umount error

[Natee T. <nat...@gm...>]

head node: VirtualBox debian-6.0.5-amd64
compute nodes: 2x ASRock H71M-DG3, Intel Core i5-3450, 16GB RAM

...
I: Base system installed successfully.

Creating image cache, please wait
    Copying bin
    Copying boot
    Copying dev
    Copying etc
    Copying home
    Copying lib
    Copying lib64
    Copying media
    Copying mnt
    Copying opt
    Copying proc
    Copying root
    Copying sbin
    Copying selinux
    Copying srv
    Copying sys
    Copying tmp
    Copying usr
    Copying var
    pre-install
        template: /etc/apt/apt.conf.d/99kestrel
        template: /etc/dpkg/dpkg.cfg.d/kestrel
        script:   run.disable-dpkg-upstart
    packages
        package:  /usr/share/kestrel/node/packages.d/basic_packages
        package:  /usr/share/kestrel/node/packages.d/ganglia("ganglia")
        package:  /usr/share/kestrel/node/packages.d/openmpi("openmpi")
        package:  /usr/share/kestrel/node/packages.d/plymouth
        package:  /usr/share/kestrel/node/packages.d/plymouth-themes(os=Debian)
    install
        template: /etc/cron.d/kestrel_reconnect
        edit:     /etc/default/nfs-common
        template: /etc/dhcp/dhclient-exit-hooks.d/kestrel_dhcp
        template: /etc/hostname
        template: /etc/init.d/beep_on_startup
        template: /etc/init.d/kestrel_connect
        template: /etc/init.d/kestrel_network
        edit:     /etc/init.d/umountnfs.sh
        template: /etc/kestrel/image_name
        template: /etc/network/interfaces
        edit:     /etc/pam.d/sshd
        edit:     /etc/ssh/sshd_config
        edit:     /etc/ssh/ssh_known_hosts
        edit:     /etc/sudoers
        template: /etc/sudoers.d/kestrel
        edit:     /etc/udev/rules.d/70-persistent-net.rules
        edit:     /sbin/dhclient-script
        template: /sbin/kestrel_beep
        template: /sbin/kestrel_connect
        template: /sbin/kestrel_disconnect
        template: /sbin/num_of_cpus
        script:   run.add-users
    system-install
        edit:     /var/lib/kestrel/tftpboot/pxelinux-image-list
        template: /var/lib/lxc/image1/config
        template: /var/lib/lxc/image1/fstab
        script:   restart.nfs
    configure
        script:   check.plymouth
        edit:     /etc/fstab
        template: /etc/ganglia/gmond.conf
        template: /etc/hosts
        edit:     /etc/kestrel/beep_melody
        edit:     /etc/passwd
        edit:     /etc/ssh/sshd_config
    system-configure
        script:   /var/lib/kestrel/tftpboot/check.cmdline-options
        edit:     /etc/exports
        edit:     /etc/fstab
        template: /var/lib/kestrel/tftpboot/pxelinux-image1
        script:   restart.nfs
umount: /var/lib/kestrel/images/image1/proc: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
natee@kestrel:~$