FC6->FC7 Kernel Panic

[Howard Wilkinson]

Tod wrote:
> Michael Schwendt wrote:
>> On Wed, 09 Apr 2008 15:49:19 -0400, Tod wrote:
>>
>>> I'm attempting to upgrade one of my servers from FC6-FC7 on the way 
>>> to FC8.  I followed all the recommendations including the disk 
>>> LABELs, etc and everything seemed to work.  But once I rebooted I 
>>> got a kernel panic because my /boot directory can't be found.
>>>
>>> I have two IDE drives both LVM managed except for a small boot 
>>> partition on the first drive.  I can boot back to FC6 just fine, but 
>>> get the kernel panic when I try the FC7 kernel.  My grub.conf looks 
>>> like this:
>>>
>>>
>>> # grub.conf generated by anaconda
>>> #
>>> # Note that you do not have to rerun grub after making changes to 
>>> this file
>>> # NOTICE:  You have a /boot partition.  This means that
>>> #          all kernel and initrd paths are relative to /boot/, eg.
>>> #          root (hd0,0)
>>> #          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
>>> #          initrd /initrd-version.img
>>> #boot=/dev/hda
>>> default=0
>>> timeout=5
>>> splashimage=(hd0,0)/grub/splash.xpm.gz
>>> hiddenmenu
>>> title Fedora (2.6.23.15-80.fc7)
>>>          root (hd0,0)
>>>          kernel /vmlinuz-2.6.23.15-80.fc7 ro root=LABEL=/boot
>>>          initrd /initrd-2.6.23.15-80.fc7.img
>>
>> root=LABEL=/boot  clearly is wrong. The kernel root= parameter specifies
>> the system's root partition, but LABEL=/boot points to your
>> /boot partition instead, /dev/sda1 = (hd0,0).
>
>
> Yes my mistake, see below.
>
>
>>
>>> title Fedora Core (2.6.22.14-72.fc6)
>>>          root (hd0,0)
>>>          kernel /vmlinuz-2.6.22.14-72.fc6 ro 
>>> root=/dev/VolGroup00/LogVol00 hdc=ide_scsi
>>>          initrd /initrd-2.6.22.14-72.fc6.img
>>>
>>>
>>> After the first time I booted I changed the FC7 kernel line, it 
>>> originally looked the same as the FC6 line.  That didn't help. 
>>
>> That's strange.
>
> I guess it would be if I could type.  The /boot label thing was just 
> wrong, I don't know where I picked that up from.  The original fc7 
> kernel line was:
>
> kernel /vmlinuz-2.6.23.15-80.fc7 ro root=/dev/VolGroup00/LogVol00 
> hdc=ide_scsi
>
> ... very _similar_ to the original fc6 line.
>
>
> Its funny because the only thing that isn't volume managed is the 
> /boot partition, which is labeled.  My understanding was that LVM 
> managed partitions don't require labeling.
>
> I also thought I read that all drives were now treated as SCSI drives. 
> With that in mind I tried removing hdc=ide_scsi to see if that would 
> make any difference.  That didn't really help either.  But I can still 
> boot up FC6 without a problem.
>
> If anybody has any ideas I'd certainly appreciate it.
>
> Thanks.
>
There was a problem with the dependency on LVM and/or the RAID drivers 
in the kernel installation on FC7, you had to rebuild the initrd to get 
the right drivers available on boot so that the root partition could be 
activated. I got round this by rebuilding initrd in the %post section of 
the kickstart before rebooting. You should be able to get round it by 
reinstalling the kernel package, it should detect the correct drivers 
now the system is built! Alternatively run mkinitrd for the new kernel 
and then reboot!


-- 

Howard Wilkinson

	

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