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Old 07-27-2006, 01:32 AM   #1
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Boot cd initrd error - pivot_root: Device or resource busy

Currently making a boot cd on a Slackware 10.0 machine using a kernel and mkinitrd that comes with Slackware 10.0 . I have compiled ext2, ext3, reiserfs, ram and initrd into the kernel and not as a module.

but I still keep getting this error that I have searched google for but still cannot correct it.

RAMDISK: Compressed image found at block 0
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 180k freed
/boot/initrd.gz: Exiting
pivot_root: pivot_root: Device or resource busy
Kernel panic - not syncing: Attempted to kill init!
I had similiar problems with it trying to mount the root system on the root device, I commented it out and those errors stopped, but this doesn't work for pivot_root, and I'm not sure if commenting out the mounting has something to do with it, I think the root device was already mounted and was returning the busy error.

Here is the linuxrc files created by mkinitrd, if someone has any ideas would greatly appreciate it

# Mount /proc:
mount -n proc /proc -t proc
echo "proc mounted"

# Load kernel modules:
if [ ! -d /lib/modules/`uname -r` ]; then
  echo "No kernel modules found for Linux `uname -r`."
elif [ -x ./load_kernel_modules ]; then # use load_kernel_modules script:
  echo "/boot/initrd.gz:  Loading kernel modules from initrd image:"
  . ./load_kernel_modules
else # load modules (if any) in order:
  if ls /lib/modules/`uname -r`/*.*o 1> /dev/null 2> /dev/null ; then
    echo "/boot/initrd.gz:  Loading kernel modules from initrd image:"
    for module in /lib/modules/`uname -r`/*.*o ; do
      insmod $module
    unset module

# Initialize LVM:
if [ -x /sbin/vgscan ]; then
  /sbin/vgscan --mknodes
  sleep 10
  /sbin/vgchange -ay

# If /rootdev isn't set, we'll have to trust exiting to work here.
# It's harder to clean up the initrd without a pivot_root,
# so it's a good idea to set rootdev (and rootfs) properly.
if [ -r /rootdev ]; then
  if [ "`cat /rootdev`" = "" ]; then
    exit 0
  exit 0

# Switch to real root partition:
ROOTDEV=`cat /rootdev`
ROOTFS=`cat /rootfs`

# Change root device to /dev/ram0
echo 0x0100 > /proc/sys/kernel/real-root-dev

#mount -o ro -t $ROOTFS $ROOTDEV /mnt
if [ ! "$ERR" = "0" ]; then
  echo "ERROR:  mount returned error code $ERR.  Trouble ahead."
unset ERR
umount /proc
# OK, in case there's no initrd directory:
if [ ! -d /mnt/initrd ]; then
  mount -o remount -o rw -t $ROOTFS $ROOTDEV /mnt
  mkdir -p /mnt/initrd
  mount -o remount -o ro -t $ROOTFS $ROOTDEV /mnt
cd /mnt
# bye now
echo "/boot/initrd.gz:  exiting"
pivot_root . initrd
exit 0
Old 08-01-2006, 12:50 AM   #2
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Originally Posted by fotoguy
echo "/boot/initrd.gz:  exiting"
pivot_root . initrd
shouldn't you continue the script?

exec chroot . /bin/sh <<- EOF
    umount /initrd    # unmounts ramfs
    /sbin/blockdev --flushbufs /dev/ram0   # clears ramsfs
    exec /sbin/init ...    # start the real init
Old 08-03-2006, 07:44 PM   #3
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Registered: Mar 2003
Location: Brisbane Queensland Australia
Distribution: Custom Debian Live ISO's
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Originally Posted by konsolebox
shouldn't you continue the script?
Thanks for the reply konsolebox, I thought it may need some more to the script, but thought that at least mkintrd would bring it to a console so you could then do some more customising.

I tried your suggestion and got a little further before running into some more problems, I think I will have a go at modifying the original slackware intrd.img and use that. I can get it to boot up to the command line, but I just have too work out how to get it to run the gtk+ based application I have designed.

Thanks very much for the suggestion and time.


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