compiling kernel problem --- Kernel panic: unable to mount root fs ........

anthonymts123 · 07-27-2006, 09:58 AM

Dear all,

Now, My FC5 originally use 2.6.15-1 kernel, after i compile it to 2.6.16.1 OR 2.6.16.2 from the source of kernel.org, it shows the problem in the following after reboot.

kernel panic - no syncing: VFS: Unable to mount root fs on unknown-block (3, 2)

Can anyone tell me the reason which causing this problem? How can I solve it?

Thank you

AzrielMacKay · 07-27-2006, 11:35 AM

Sounds like your bootloader has the wrong root fs set in it. You using grub? Make sure your /boot/grub/menu.lst file's entry for your new kernel looks like your old one on everything but the kernel name.

lockpicker · 07-27-2006, 11:39 AM

i guess the problem is with the newer kernel as the older version was running fine so there are less chances of getting something wrong with the bootloader. Quite possibly you may have missed out or compiled the support for your filesystem as a module instead of built in!! check that!! Mos t likely it should solve your problem.

truthfatal · 07-27-2006, 11:51 AM

If you accidentally built your Filesystem as a module you could also make an initrd (initial ramdisk)rather than re-compile your kernel. If FC5 has mkinitrd, try 'man mkinitrd'. essentially, it will load your filesystem module before it trys to mound your root partiton.

Matir · 07-27-2006, 12:04 PM

In addition to your filesystem, make sure support for your IDE/SATA/SCSI controller is built into the kernel.

anthonymts123 · 07-31-2006, 03:29 AM

Thank you very much.
The method of mkinitrd is work.

First, I go to the folder "/lib/modules"
type "initrd <img name> <folder name>"
and then move the <img file> to /boot and add the initrd file to the /boot/grub/menu.lst
last steps, i can reboot to my new kernel.