Kernel panic not syncing VFS: Error during booting remastered CD

[Basudeb]

I have remastered a Live CD by adding some executable and using this script:
#! /bin/sh
# krhowto_4
# Path to partition you will work on
PFAD="/media/sda1"
START=$(date +'%s')
# Disable screensaver
xscreensaver-command -exit
# Build new inital RAM-disk
cd $PFAD/knx/minirt/minirtdir/
find . | cpio -oH newc | gzip -9 > ../minirt.gz
cp $PFAD/knx/minirt/minirt.gz $PFAD/knx/master/boot/isolinux/
# Make the big compressed filesystem KNOPPIX
genisoimage -input-charset ISO-8859-15 -R -l -D -V KNOPPIX_FS -quiet \
-no-split-symlink-components -no-split-symlink-fields \
-hide-rr-moved -cache-inodes $PFAD/knx/source/KNOPPIX \
| /usr/sbin/create_compressed_fs -q -B 65536 -t 8 -L -1 \
-f $PFAD/knx/isotemp - $PFAD/knx/master/KNOPPIX/KNOPPIX
# Update the file hashes used by the "testcd" boot option
cd $PFAD/knx/master ; find -type f -not -name \
sha1sums -not -name boot.cat -not \
-name isolinux.bin -exec sha1sum '{}' \; > KNOPPIX/sha1sums
# Create new Knoppix ISO
genisoimage -l -r -J -V "KNOPPIX" \
-b boot/isolinux/isolinux.bin -no-emul-boot -boot-load-size 4 \
-boot-info-table -c boot/isolinux/boot.cat \
-o $PFAD/knx/remasterd.iso $PFAD/knx/master
# Enable screensaver
su knoppix -c "xscreensaver -nosplash &"
echo -e "\nFinished! Used time: $(expr $(expr $(date +'%s') - $START) / 60) min. \
and $(expr $(expr $(date +'%s') - $START) % 60) sec. \
\n\nThe new ISO is stored in '$PFAD/knx/remastered.iso' "[/COLOR]

My knoppix version is 6.7.1.
When I run the iso which is 725 mb it boots up, shows logo, and boot.. if i let it continue it shows this:
Decompressing Linux... Parsing ELF.... done
Booting the kernel..
[ 3.171152] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)....
I have tried it many times but get the same result. I am using VMWare 8.0.6 to do all this.

[Werner P. Schulz]

Did you get an error message booting your remastered version with cheatcode

knoppix testcd

[Basudeb]

I do not know how to use cheatcode. But I have tried
kvm -m 512 -cdrom $PFAD/knx/remastered.iso
It showed the logo, boot: and then the same messages
Decompressing Linux... Parsing ELF.... done
Booting the kernel..
[ 3.171152] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)....

[Werner P. Schulz]

http://knoppix.net/wiki/Cheat_Codes

[Basudeb]

If I type knoppix testcd, I get same error

[Basudeb]

I tried all the cheatcodes including 'knoppix debug' This gave me more detailed information that was:
[ 3.317878] VFS: Cannot open root device "(null)" or unknown-block(8,1)
[3.317944] Please append a correct "root=" boot option; here are the available partitions:
[ 3.318010] 0b00 1048575 sr0 driver:sr
[ 3.318076] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)
[ 3.318142] Pid: 1. comm: swapper Tainted:G W 3.0.4 #12 etc.

Where do I start checking?

[Werner P. Schulz]

I have remastered a Live CD by adding some executable and using this script

Your remaster by itself is wrong. The sripts of Remaster HowTo I've tested many times.

[Basudeb]

Of course my remaster is wrong. and I have also tested it many times before. But this time it does not work. I have also given the script I have used for remaster. I have used only two major steps for remastering that could affect the final result:
1. ran the following:
#! /bin/sh
# krhowto_1
# Path to partition you will work on
PFAD="/media/sda1"
START=$(date +'%s')
# Disable screensaver
xscreensaver-command -exit
# One sub-directory will be used for the Master-CD
mkdir -p $PFAD/knx/master
cd $PFAD/knx
# You will need a swapfile
dd if=/dev/zero of=swapfile bs=1M count=500
mkswap swapfile ; swapon swapfile
# Make a sub-directory for the source
mkdir -p $PFAD/knx/source/KNOPPIX
echo "Copy the KNOPPIX files to your source directory."
echo "This will take a long time!"
cp -rp /KNOPPIX/* $PFAD/knx/source/KNOPPIX
# Additionally, copy the files to build the ISO later
rsync -aH --exclude="KNOPPIX/KNOPPIX*" /mnt-system/* $PFAD/knx/master
# gunzip inital RAM-disk
mkdir -p $PFAD/knx/minirt/minirtdir
cp $PFAD/knx/master/boot/isolinux/minirt.gz $PFAD/knx/minirt/
cd $PFAD/knx/minirt/
gunzip minirt.gz
cd minirtdir
cpio -imd --no-absolute-filenames < ../minirt
# Enable screensaver
su knoppix -c "xscreensaver -nosplash &"
echo -e "\nFinished! Used time: $(expr $(expr $(date +'%s') - $START) / 60) min. \
and $(expr $(expr $(date +'%s') - $START) % 60) sec."

2. copied my executables
3. Did the following:
Create the autostart parameters as below.

Created a file called myprog.desktop in /media/sda3/knx/source/KNOPPIX/home/knoppix/.config/autostart folder with the following contents:cd us

[Desktop Entry]
Type=Application
Name=myprog
Exec=sudo /usr/loca/bin/myprog.sh &
Terminal=false
X-GENOME-Autostart-enabled=true

B. Create a file in /usr/local/bin/myprog.sh with exec permission with contents:
#!/bin/sh
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
/bin/myprog



3. Executed Bash remaster.sh which created the .iso

So, where I am going wrong.

[Werner P. Schulz]

# Path to partition you will work on
PFAD="/media/sda1"

You have to declare the value of "PFAD" as you need it within all the four scriptparts of the HowTo.

Created a file called myprog.desktop in /media/sda3/knx/source/KNOPPIX/home/knoppix/.config/autostart folder with the following contents:cd us

/sda3 or /sda1? And what about "cd us"?

Create a file in /usr/local/bin/myprog.sh with exec permission with contents:
#!/bin/sh

At this point are you working within the chroot or after leaving it?

But as I can see it, this is not the reason for the unbootable remastered version.

[Basudeb]

Sure I changed all the PFAD to proper sda or sdb as the case may be. I did not use chroot but copied the files in the proper path. As the system anyway booted and came upto boot: , I also think this is not the reason. So, what is the reason? Firstly what is the error? And how do I get rid of it?