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    Are you sure that /mnt/chroot/sys/kernel/security is mounted at that point? What is the output of grep /sys/kernel/security /proc/mounts? umount doesn't need its argument to be listed in /etc/mtab. If you pass it -n, it won't open the file at all. Commented Mar 21, 2014 at 23:15
  • If you look closely at my grep command for creating the xargs for umount, I'm only sending it the mounts listed in /proc/mounts Commented Mar 22, 2014 at 6:17