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Old 7th May 2012, 07:09 PM
itsjustarumour Offline
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Kernel upgrade broke system - kernel panic and unable to boot

Fedora 16.x86_64
Kernel 3.3.2-6.fc16.x86_64
NVidia binary blob.

Well, I thought it would never happen to me, but I installed a kernel update and its borked my system - and as luck would have it, this is my pride-and-joy "production" machine... BAH.

On rebooting, I just got the message:

Quote:
Kernel Panic - not synching: VFS: Unable to mount root fs on unknown-block (0,0)
I had two old kernels available, but discovered I couldn't now boot from either of those either - I got the blue lines to indicate the OS was loading, but then at the end they froze. Checking the verbose output showed it was sticking at:

Quote:
Started LSB: Automatically install DKMS modules for new kernels (OK)
I burnt a copy of the DVD .ISO and booted off that into rescue mode... so far so good. I discovered there was an incomplete yum transaction pending. Running a quick

Code:
yum-complete-transaction
fixed that bit, but I was still unable to boot.

I was able to get an ethernet connection working, and ran yum-update and yum-upgrade much installed another new kernel, but still no joy. I tried running

Code:
yum reinstall kernel
for each of my three kernels in turn, but that told me that the kernel wasn't available.

I've tried a few things, and have ended up uninstalling both newer kernels, leaving me with just the one last known-good kernel. I checked that the initrd /boot/initramfs-kernel-version.img existed for the kernel version I was tying to boot in /boot/, but that all looked in order (I tried running dracut --force anyway).

At some point (I can't remember exactly where, and I'm not at the machine at the moment) I got this output that seems to show what the problem is:

Code:
E: FATAL: Could not load /lib/modules/3.1.0-7.fc16.x86_64/modules.dep:
No such file or directory
find: @/lib/modes/3/1/0-7.fc16.x86_64/@ : No such file or directory
So - my question is this - how do I reload (or rebuild?) that particular kernel module? Or is my system completely borked? I have to confess I'm rapidly reaching the outer limits of my Fedora knowledge on this one, and most fixes I've read assume the ability to choose a working kernel at the grub boot screen, which I don't have...

Any help or wisdom gratefully received!

Best,

itsjustarumour

Last edited by itsjustarumour; 8th May 2012 at 07:13 PM.
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boot, broke, kernel, panic, unable, upgrade

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