Kernel panic with 2.6.32-26 security upgrade

Bug #687392 reported by Raphaël Pinson on 2010-12-08
This bug affects 6 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Kai Nentwig

Bug Description

Upgrading to the latest kernel on Lucid (2.6.32-26.48) yields on kernel panic upon reboot with:

VFS: Unable to mount root fs on unknown-block(0,0)

This bug has been reported by other users on the forums, see for example.
This is a major issue since this version of the kernel fixes a major security vulnerability.

Raphaël Pinson (raphink) wrote :
Changed in linux (Ubuntu):
importance: Undecided → Critical
Raphaël Pinson (raphink) wrote :
Raphaël Pinson (raphink) wrote :
Raphaël Pinson (raphink) wrote :

When I upgraded to Maverick 10.10 something went wrong with the installation and the grub failed to boot, I think that's the same problem

Aaron Brady (bradya) wrote :


This may be a grub1 problem; we were running this kernel version under grub1 (because that's what vmbuilder does) and KVM and had two machines fail to boot. Editing the "root" kernel parameter from the UUID to /dev/sda1 and booting allowed us to boot correctly. Upgrading to the latest kernel seemed to fix this regression.

Raphaël Pinson (raphink) wrote :

In our case, this is not a grub1 issue, we use grub2.

Vladimir Scherbaev (zemik) wrote :

I have seems kernel panic on 2.6.32-26 и 2.6.32-27:
Kernel Panic - not syncing: init not found. try passing init= option to the kernel

But 2.6.32-25 work fine.
If need I can attach any information.

Tim Gardner (timg-tpi) wrote :

Raphaël Pinson - Can you tell me what was the last known good kernel that works for you?

Jeremy Foshee (jeremyfoshee) wrote :

setting incomplete per TGardner's last request for information.


Changed in linux (Ubuntu):
status: New → Incomplete
Changed in linux:
status: New → Confirmed
Simon Bull (simon-d-bull) wrote :

Hi there - i can confirm this bug.

On two occasions I have had issues with the kernel and grub after an update. On both occasions it failed to mount root fs and also had many tty errors. For the record, the kernels in question for me were 2.6.32-26 as well as the 2.6.35-22 kernel.


Vladimir Scherbaev (zemik) wrote :

All initrd images broken after another update. If I load with initrd for my kernel from other Ubuntu Server -- it's work.

After "update-initramfs -k all" -- all initrd's are broken.

Bob Harvey (bobharvey) wrote :

PING - Is anything happening?

JAY (richalakhlani) on 2011-07-20
Changed in linux (Ubuntu):
status: Incomplete → Confirmed
status: Confirmed → Incomplete
Changed in linux (Ubuntu):
status: Incomplete → New
status: New → Confirmed
assignee: nobody → Kai Nentwig (kai-nentwig)
Hamdy Arifin (onyxdua) on 2011-09-20
Changed in linux (Ubuntu):
status: Confirmed → Fix Released
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