Kernel panic:unable to boot with compiled kernel...

[rabantu]

Hi,

I am running Xubuntu 7.04 ( Kernel 2.6.20.16). It works great.

Then I got the 2.6.22.1 kernel compiled it with no problem. Changed the menu.lst( added an entry into it to boot my compiled kernel ).

I get the following errors:
:
:
:
please append a correct "root=" boot option
kernel panic - not syncing: vfs: unable to mount fs on unknown-block(0,0)

....................................

I tried lots of options but nothing helped. Can someone plaese point me in the right direction?

Thanks in advance.

[Dapper Dan]

Can you post your menu.lst here? Also, post the output of:

ls /boot

[devils casper]

Post the contents of /etc/fstab file too.

[rabantu]

Can you post your menu.lst here? Also, post the output of:

ls /boot

default         0
timeout         20

hiddenmenu

title           Ubuntu, kernel 2.6.20-16-generic
root            (hd0,0)
kernel          /boot/vmlinuz-2.6.20-16-generic root=UUID=815118fc-4552-4161-abc0-63ea58561d54 ro quiet splash
initrd          /boot/initrd.img-2.6.20-16-generic
quiet
savedefault

title           Ubuntu, kernel 2.6.20-16-generic (recovery mode)
root            (hd0,0)
kernel          /boot/vmlinuz-2.6.20-16-generic root=UUID=815118fc-4552-4161-abc0-63ea58561d54 ro single
initrd          /boot/initrd.img-2.6.20-16-generic

title           Ubuntu, kernel 2.6.20-15-generic
root            (hd0,0)
kernel          /boot/vmlinuz-2.6.20-15-generic root=UUID=815118fc-4552-4161-abc0-63ea58561d54 ro quiet splash
initrd          /boot/initrd.img-2.6.20-15-generic
quiet
savedefault

title           Ubuntu, kernel 2.6.20-15-generic (recovery mode)
root            (hd0,0)
kernel          /boot/vmlinuz-2.6.20-15-generic root=UUID=815118fc-4552-4161-abc0-63ea58561d54 ro single
initrd          /boot/initrd.img-2.6.20-15-generic

title           Ubuntu, kernel 2.6.22.1
root            (hda,1)
kernel          /boot/vmlinuz-2.6.22.1 root=/dev/hda1 ro
initrd          /boot/initrd-2.6.22.1.img

title           Ubuntu, memtest86+
root            (hd0,0)
kernel          /boot/memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST

************************************************** ********************

ls -l /boot 

total 88244
-rw-r--r-- 1 root root   414210 2007-04-15 04:07 abi-2.6.20-15-generic
-rw-r--r-- 1 root root   414274 2007-06-07 16:58 abi-2.6.20-16-generic
lrwxrwxrwx 1 root root       15 2007-08-02 23:54 config -> config-2.6.22.1
-rw-r--r-- 1 root root    83234 2007-04-15 01:33 config-2.6.20-15-generic
-rw-r--r-- 1 root root    83217 2007-06-07 14:16 config-2.6.20-16-generic
-rw-r--r-- 1 root root    81509 2007-08-02 23:54 config-2.6.22.1
-rw-r--r-- 1 root root    81509 2007-08-02 22:10 config-2.6.22.1.old
lrwxrwxrwx 1 root root       19 2007-08-02 23:54 config.old -> config-2.6.22.1.old
drwxr-xr-x 2 root root     4096 2007-08-05 19:24 grub
-rw-r--r-- 1 root root 57237504 2007-08-03 00:00 initrd-2.6.22.1.img
-rw-r--r-- 1 root root  7158365 2007-07-02 21:52 initrd.img-2.6.20-15-generic
-rw-r--r-- 1 root root  6841615 2007-04-15 09:20 initrd.img-2.6.20-15-generic.bak
-rw-r--r-- 1 root root  6928414 2007-07-09 22:55 initrd.img-2.6.20-16-generic
-rw-r--r-- 1 root root    94600 2006-10-20 07:44 memtest86+.bin
lrwxrwxrwx 1 root root       19 2007-08-02 23:54 System.map -> System.map-2.6.22.1
-rw-r--r-- 1 root root   806942 2007-04-15 04:08 System.map-2.6.20-15-generic
-rw-r--r-- 1 root root   806992 2007-06-07 17:00 System.map-2.6.20-16-generic
-rw-r--r-- 1 root root   882466 2007-08-02 23:54 System.map-2.6.22.1
-rw-r--r-- 1 root root   882466 2007-08-02 22:10 System.map-2.6.22.1.old
lrwxrwxrwx 1 root root       23 2007-08-02 23:54 System.map.old -> System.map-2.6.22.1.old
lrwxrwxrwx 1 root root       16 2007-08-02 23:54 vmlinuz -> vmlinuz-2.6.22.1
-rw-r--r-- 1 root root  1745100 2007-04-15 04:07 vmlinuz-2.6.20-15-generic
-rw-r--r-- 1 root root  1746636 2007-06-07 16:58 vmlinuz-2.6.20-16-generic
-rw-r--r-- 1 root root  1932628 2007-08-02 23:54 vmlinuz-2.6.22.1
-rw-r--r-- 1 root root  1932692 2007-08-02 22:10 vmlinuz-2.6.22.1.old
lrwxrwxrwx 1 root root       20 2007-08-02 23:54 vmlinuz.old -> vmlinuz-2.6.22.1.old

[rabantu]

Post the contents of /etc/fstab file too.

# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /dev/hda1
UUID=815118fc-4552-4161-abc0-63ea58561d54 / ext3 defaults,errors=remount-ro 0 1
# /dev/hda5
UUID=7756db50-b8a4-4196-8c74-4c2c4fd4d2bf none swap sw 0 0
/dev/hdc /media/cdrom0 udf,iso9660 user,noauto 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto 0 0

[devils casper]

title Ubuntu, kernel 2.6.22.1
root (hda,1)
kernel /boot/vmlinuz-2.6.22.1 root=/dev/hda1 ro
initrd /boot/initrd-2.6.22.1.img

Why its (hda,1)?
It should be root (hd0,0).

[rabantu]

Why its (hda,1)?
It should be root (hd0,0).

Hi,

It was originally (hd0,0) and i was getting that error. And somewhere in the forums I read that we need to point to the correct device on our systems which is hda1 as you can see from the contents of the fstab file.

I can change it back to (hd0,0). I think I will get the same error though

[devils casper]

Try to change it and post exact error message here, if any.
I dont think it will throw any error because every thing is correct now. Let see...

[rabantu]

Try to change it and post exact error message here, if any.
I dont think it will throw any error because every thing is correct now. Let see...

Hi,
I still have the same errors....
.
.
.
.
[ 44.590291] RAMDISK: cramfs filesystem found at block 0
[ 44.590462] RAMDISK: Loading 55896KiB [1 disk] into ram disk... done.
[ 46.899335] List of all partitions
[ 46.899462] No filesystem could mount root, tried: reiserfs ext2
[ 46.899682] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)



****************
Ok. I want to explain the RAMDISK messages. Initially I had 16 disks each 4096KiB. Since, my initrd image is about 54MB, I changed my RAMDISK size to be 64MB and reduced the number of disks from 16 to 1. I did this through menuconfig.
I am not sure if this is helpful info.

Thanks for all your help.

[rabantu]

Hi,
I still have the same errors....
.
.
.
.
[ 44.590291] RAMDISK: cramfs filesystem found at block 0
[ 44.590462] RAMDISK: Loading 55896KiB [1 disk] into ram disk... done.
[ 46.899335] List of all partitions
[ 46.899462] No filesystem could mount root, tried: reiserfs ext2
[ 46.899682] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)



****************
Ok. I want to explain the RAMDISK messages. Initially I had 16 disks each 4096KiB. Since, my initrd image is about 54MB, I changed my RAMDISK size to be 64MB and reduced the number of disks from 16 to 1. I did this through menuconfig.
I am not sure if this is helpful info.

Thanks for all your help.

Please someone point me in the right direction.