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Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
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TOPIC: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
#46626
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 2 Years, 2 Months ago  
After installing updates and rebooting the machine I now get:

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

I have installed the machine twice now - I checked the hardware using the HP tools for my ML110G5 before my second install.

ClearOS runs fine in gateway mode until I install updates. Then it fails on boot.

Any idea why?
Tim
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#46648
Re:Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 2 Years, 2 Months ago  
I am having exactly the same problem (kernel 2.6.32-279.5.2.v6.x86_64).

I am able to boot by selecting the previous version (kernel 2.6.32-279.2.1.v6.x86_64) at startup.

I have noticed that GRUB uses an initrd image for the previous version but not for the new version, not sure if that has anything to do with it or not.

Also, I have both the /boot and / partitions configured with software RAID and not sure if that is contributing to the problem.

Any help greatly appreciated.
Andrew Mills
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#46673
Re:Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 2 Years, 2 Months ago  
Andrew Mills wrote:
I am having exactly the same problem (kernel 2.6.32-279.5.2.v6.x86_64).

I am able to boot by selecting the previous version (kernel 2.6.32-279.2.1.v6.x86_64) at startup.

I have noticed that GRUB uses an initrd image for the previous version but not for the new version, not sure if that has anything to do with it or not.

Also, I have both the /boot and / partitions configured with software RAID and not sure if that is contributing to the problem.

Any help greatly appreciated.

I recall having a similar problem on 5.2... Install, update, reboot, fail.
I solved it following advice I found on another thread:
1. Boot from CD and start rescue mode
2. Allow the rescue program to detect the partitions and run the following commands:
Code:


grub
root (hd0,0)
setup (hd0)
quit
exit


Haven't tested with v6. YMMV.
georger
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#46678
Re:Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 2 Years, 2 Months ago  
Thanks for the reply, unfortunately it didn't work for me.

No errors were reported following those steps but I'm still experiencing exactly the same problem, although for now I have edited my grub.conf to default to the previous kernel version which is working o.k. as a temporary fix.

Any more ideas?
Andrew Mills
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#46681
Re:Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 2 Years, 2 Months ago  
Hello,

Same issue.

Grub.conf nok. Line --> initrd /initramfs-2.6.32-279.5.2.v6.x86_64.img not present.

file /boot/initramfs-2.6.32-279.5.2.v6.x86_64.img not present.

yum reinstall kernel.x86_64.

--> OK.
bminux
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Last Edit: 2012/10/03 05:01 By 7513280.
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E6600 - 4 Go Ram - 6 x 640 Go raid 5 - CC Enterprise 5.2
 
#46683
Re:Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 2 Years, 2 Months ago  
Thanks for that.

Worked a treat.
Andrew Mills
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#46684
Re:Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 2 Years, 2 Months ago  
Would somebody be so kind as to spell out bminux's answer just a little more? I'm having this frustrating issue as well, and I didn't quite understand what he meant by the first two lines,

"Grub.conf nok. Line --> initrd /initramfs-2.6.32-279.5.2.v6.x86_64.img not present.

file /boot/initramfs-2.6.32-279.5.2.v6.x86_64.img not present.

yum reinstall kernel.x86_64."

I grasp the third line. What are the first two lines instructing me to do? And we're doing this when booted to the old kernel or to rescue mode off media?

Thanks all!
Wes McMurrian
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#46685
Re:Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 2 Years, 2 Months ago  
hello,

Just boot with the old kernel and then --> yum reinstall kernel.x86_64

The first two lines are in the config file /etc/grub.conf

bminux.
bminux
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E6600 - 4 Go Ram - 6 x 640 Go raid 5 - CC Enterprise 5.2
 
#49311
Re:Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 1 Year, 11 Months ago  
How do we boot into the old kernel, when it's unbootable?
Roger Wheatley
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#49313
Re:Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 1 Year, 11 Months ago  
Ah! Update... The actual fix is in this post: 6.3.0 Install Latest Updates, Reboot, Kernel Panic - Unable to mount root fs
Answer as provided by " Michael Sporer " - Thanks!
Roger Wheatley
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