Kernel Panic due to Missing Initramfs,

Elsayed, Omar 25

Hello,

I´m facing the above mentioned issue while I´m trying to connect using SSH, and power shell.

I have tried to execute the suggest troubleshooting methods from Azure, but it does not work, could anyone out there help me out with this?

User's image

attached here 1st image for the suggest solution, but it does not work due to admin credential while fetching the security group.

the other suggested solution is to solve it through the serial console which I do not have access to.

so can please anyone of you assist me with a proper solution for my error?

thanks in advance

Best regards,

Omar

Sai Krishna Katakam 1,710 Reputation points Microsoft Vendor

2025-01-15T09:49:02.99+00:00
Hi Elsayed, Omar,

Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.

It looks like you're facing a kernel panic due to a missing initramfs. Here are some steps to resolve this:

Use the Azure portal to view the serial console log output of the VM in the boot diagnostics blade or serial console blade to identify the issue.

If you have a backup, consider restoring the VM.

Use the serial console to boot from an older kernel version. See Boot system on older kernel version.

If the serial console is not available, create a repair VM and attach the affected VM's OS disk to it. Follow the steps in Troubleshoot a Linux VM by attaching the OS disk to a recovery VM.

For more details, please refer to the below documentation:
Kernel panic in Azure Linux VMs
Azure Linux virtual machine fails to boot after applying kernel changes

If you have any further queries, do let us know. If the comment is helpful, please click "Upvote".
Sai Krishna Katakam 1,710 Reputation points Microsoft Vendor

2025-01-20T00:32:37.53+00:00

Hi Elsayed, Omar,

Just checking in to see if you had a chance to review my comment on your question. Please let us know if it was helpful and feel free to reach out if you have any further queries.

If you found the information useful, please click "Upvote" on the post to let us know.

Thank You.
Elsayed, Omar 25 Reputation points

2025-01-20T10:19:36.0733333+00:00

Hello,

thanks a lot your reminder and suggested troubleshoot.

actually the issue is still there, I´m able to login from the serial console, and when I´m logged in from it, I can open the VM using power shell, but when the console is off the same error is there.

I tried to boot to the older kernel version but it requires the log in which is not available right now.

do you have any idea how how I can overcome the Login?

or anther way that can avoid the login?
Elsayed, Omar 25 Reputation points

2025-01-20T14:29:53.01+00:00

Hello,

thanks a lot your reminder and suggested troubleshoot.

actually the issue is still there, I´m able to login from the serial console, and when I´m logged in from it, I can open the VM using power shell, but when the console is off the same error is there.

I tried to boot to the older kernel version but it requires the log in which is not available right now.

do you have any idea how how I can overcome the Login?

or anther way that can avoid the login?
Sai Krishna Katakam 1,710 Reputation points Microsoft Vendor

2025-01-22T04:02:43.9533333+00:00
Hi Elsayed, Omar,

Thank you for providing more details. If you are unable to log in during the boot process or want to bypass the login prompt, here are two potential solutions:

Reset the Root Password via Serial Console
While logged into the Serial Console:

Reset the root password

sudo passwd root

Set a new secure password that you can use for login when prompted.

Modify Grub to Bypass Login Temporarily

From the Serial Console, modify the GRUB configuration to boot directly into the system without requiring a login:

Edit the GRUB configuration file:

sudo nano /etc/default/grub

Add or modify the GRUB_CMDLINE_LINUX line to include:

init=/bin/bash

Update the GRUB configuration:

sudo grub2-mkconfig -o /boot/grub2/grub.cfg

Reboot the VM

This will boot the system into a bash shell without requiring a login. You can then investigate and fix the underlying issue.

If you have any further queries, do let us know. If the comment is helpful, please click "Upvote".
Sai Krishna Katakam 1,710 Reputation points Microsoft Vendor

2025-01-23T03:55:07.5966667+00:00

Hi Elsayed, Omar,

Just checking in to see if you had a chance to review my comment on your question. Please let us know if it was helpful and feel free to reach out if you have any further queries.

If you found the information useful, please click "Upvote" on the post to let us know.

Thank You.
Elsayed, Omar 25 Reputation points

2025-01-23T09:42:15.33+00:00

Hello @Sai Krishna Katakam ,

thanks a lot for your reminder, actually I´m not performed the suggest solution from you yet.

once I finish it and works, will let you know

best regards,

Omar
Sai Krishna Katakam 1,710 Reputation points Microsoft Vendor

2025-01-24T07:26:47.89+00:00

Hi Elsayed, Omar,

You're welcome! Take your time. Feel free to reach out if you encounter any issues or need further assistance.

Thank you.
Elsayed, Omar 25 Reputation points

2025-01-31T08:56:27.1766667+00:00

Hello @Sai Krishna Katakam ,
unfortunaltey I´m facing now another issue.

it´s in the serial console when I´m trying to open it to boot to one of already installed kernels I got the error

Bad shim signature.

can you please support me with this?
Nikhil Duserla 4,280 Reputation points Microsoft Vendor

2025-02-07T09:59:11.0966667+00:00

Hi Elsayed, Omar,

Thank you for reaching out to us and sharing the information. I am working on your issue and will get back to you soon.

1 answer

Markapuram Sudheer Reddy 515 Reputation points Microsoft Vendor

2025-02-10T13:39:00.94+00:00
Hi Elsayed, Omar ,

Thank You for your patience and please follow below given instructions.

The error which was stated above "Kernel Panic due to Missing Initramfs" can occur due to corrupted or missing initramfs for the newer kernel, I have shared troubleshooting steps that I felt will help resolve the issue you reported.

To resolve the error, we should regenerate it from the older kernel (i.e working environment) can likely be a possible solution. Since you are trying from older kernel and you stated above as you still not able to login to older kernel also, you can try with booting into recovery mode option which provides a minimal environment to access and modify the system to regenerate the initramfs. Please use below documentation below for detailed steps:

https://wiki.ubuntu.com/RecoveryMode

After that please try with below commands to regenerate the initramfs;

First verify the kernel version, uname -r

sudo update-initramfs -u -k all (Debian/Ubuntu Linux distribution systems) dracut -f /boot/initramfs-<kernelVersion>.img <kernelVersion> (CentOS, RHEL, Fedora and others Linux distribution systems)

After regenerating, update GRUB bootloader to ensure that it uses the correct kernel and initramfs sudo update-grub (Debian/Ubuntu Linux distribution systems) sudo grub2-mkconfig -o /boot/grub2/grub.cfg (CentOS, RHEL, Fedora and others Linux distribution systems)

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