kernel panic

Karl Larsen k5di at
Wed Sep 5 22:17:27 UTC 2007

Les Mikesell wrote:
> Karl Larsen wrote:
>> Les Mikesell wrote:
>>> Karl Larsen wrote:
>>>>    I found this on Google but it doesn't help me much:
>>>> echo "Loading scsi_mod module"
>>>> insmod /lib/scsi_mod.o echo "Loading sd_mod module"
>>>> insmod /lib/sd_mod.o echo "Loading cpqarray module"
>>>> insmod /lib/cpqarray.o echo "Loading jbd module"
>>>> insmod /lib/jbd.o echo "Loading ext3 module"
>>>> insmod /lib/ext3.o mount -t proc /proc /proc
>>>> echo Mounting /proc filesystem
>>>> echo Creating root device
>>>> mkrootdev /dev/root
>>>> This seems to be where /dev/root comes from. And my kernel can't 
>>>> find it for some reason.
>>>> echo 0x0100 > /proc/sys/kernel/real-root-dev
>>>> umount /proc
>>>> echo Mounting root filesystem
>>>> mount --ro -t ext3 /dev/root /sysroot
>>>> pivot_root /sysroot /sysroot/initrd
>>> There is a point in the boot sequence where the bios-loaded kernel 
>>> trades the initrd RAM disk image (also bios loaded) for the real 
>>> root partion mount point.  Several things can go wrong here. Grub 
>>> may have told the kernel to look in the wrong place for the root 
>>> file system, the file system might be unreadable, or you may have 
>>> moved the system onto a machine with a different type of disk 
>>> controller that needs a different driver module included on the 
>>> initrd.  The main reason you need the initrd is to load drivers for 
>>> the root filesystem if they aren't compiled into the kernel but it 
>>> will only include ones for the the machine where the system was 
>>> originally installed. If you can access the disk, somewhere in the 
>>> boot messages you should see it detecting the device and 
>>> partitions.  If you don't see that, the kernel can't see the disk 
>>> and you'll have to rebuild the initrd with the right module.
>>    Initrd has to be the problem Les. I have had the old hard drive on 
>> this new box and I was surprised that FC6 would boot up but F7 did 
>> what it has done all along. Now I did load a new F7 on the old hard 
>> drive and it booted up fine. So this info backs up my belief that 
>> initrd is the problem.
>>    I will now try and find out HowTo rebuild initrd from a Rescue cd :-)
> If your rescue boot mounts the system drives and suggests a chroot 
> command, do that, then add the right alias command to 
> /etc/modprobe.conf (will depend on hardware) and then run mkinitrd.
    What is an alias command? How do I find it with a rescue cd?


	Karl F. Larsen, AKA K5DI
	Linux User

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