title: ioctl LOOP_SET_FD failed
body: <p>ioctl LOOP_SET_FD failed</p>
  
  <p>I already ask about similar problem but I wrote some more detail here</p>
  
  <p>to run the ubuntu in android,
  I made an img file with rootstock
  rootstock -f kty1104-ThinkPad-Z60t -l kty1104 -p 1 --imagesize 2047M --notarball --seed linux-image-omap,lxde,build-essential,openssh-server,tightvncserver,x11-xserver-utils</p>
  
  <p>this img can chrooted on my ubuntu PC by
  sudo mount -o loop,noatime -t ext2 /home/kty1104/ubuntu.img /mnt
  sudo mount -t proc proc /mnt/proc
  chroot /mnt /bin/bash</p>
  
  <p>but when I try to this mount ~ chroot command on my android,
  it says, ioctl LOOP_SET_FD failed: Bad file number on mount command
  and when I just to force to chroot, it says "segment fault"</p>
  
  <p>I think the problems comes from rootstock command
  could somebody help me?</p>