[bugs #10333] grub seeing wrong kernel image version number after partition copy

[anonymous]

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[bugs #10333] Full Item Snapshot:

URL: <http://savannah.gnu.org/bugs/?func=detailitem&item_id=10333>
Project: GNU GRUB
Submitted by: 0
On: Thu 09/09/2004 at 12:46

Category:  Filesystem
Severity:  Major
Priority:  5 - Normal
Item Group:  None
Resolution:  None
Privacy:  Public
Assigned to:  None
Originator Name:  Tom Bryan
Originator Email:  
Status:  Open
Release:  0.93
Reproducibility:  Every Time
Planned Release:  


Summary:  grub seeing wrong kernel image version number after partition copy

Original Submission:  On a Red Hat 9.0 GNU/Linux system, I'm running grub 0.93. 
 /boot is on the same partition as the root partition.  My original root 
partition was the ext3 partition (hd0,7), and I can still boot that 
configuration without a problem.

I want to move my root partition to (hd1,0).  I used fdisk to partition and 
format (hd1,0) as ext3.  To copy the data from (hd0,7) to (hd1,0), I booted a 
Knoppix CD, mounted the drives at /mnt/old and /mnt/new, and ran 
cp -avx /mnt/old/* /mnt/new/

grub.conf now looks like this on both partitions (at /boot/grub/grub.conf):

default=0
timeout=10
splashimage=(hd1,0)/boot/grub/splash.xpm.gz
title Red Hat Linux (2.4.20-8)
        root (hd0,7)
        kernel /boot/vmlinuz-2.4.20-8 ro root=/dev/hda8
        initrd /boot/initrd-2.4.20-8.img
title Red Hat Linux (2.4.20-8 new hard drive)
        root (hd1,0)
        kernel /boot/vmlinuz-2.4.20-8 ro root=/dev/hdb1
        initrd /boot/initrd-2.4.20-8.img

If I boot using the original partition (hd0,7), then I can mount (hd1,0) at, 
for example, /newroot.  Then I can see /newroot/boot/vmlinuz-2.4.20-8.  I 
mounted (hd1,0) this way and ran rdev to switch the kernel's root device to 
/dev/hdb1.

Now, I reboot.  If I select the original configuration, the system boots fine.  
If I select the new, (hd1,0) configuration, grub stops with error 15 : File not 
found, indicating that it cannot find /boot/vmlinuz-2.4.20-8.

I rebooted and dropped to the grub command prompt.  If I type 
kernel (hd1,0)/boot/vmlinuz-
and press tab, grub tab-completes to 
kernel (hd1,0)/boot/vmlinuz-2.4.18-3.

If I tab-complete at (hd1,0)/boot/, then all of the files that show as 2.4.20-8 
when the partition is mounted (under Knoppix, for example) show up as 2.4.18-3. 
 

I then tried modifying the config file so that the second configuration read 
title Red Hat Linux (2.4.18-3 new hard drive)
        root (hd1,0)
        kernel /boot/vmlinuz-2.4.18-3 ro root=/dev/hdb1
        initrd /boot/initrd-2.4.18-3.img

When I save that to grub.conf and reboot, I can select the new hard drive 
configuration.  Grub boot and apparently finds the kernel file.  Of course, 
then the system has other problems because I have no /lib/modules-2.4.18-3, for 
example.  (It boots to a login prompt, but not all of my modules are loaded 
correctly.)

My big question is how does grub determine the filename?  I just don't even 
know what to look at next.  Why is grub seeing a different filename from the 
one reported by the OS when I mount the partition under GNU/Linux?













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