QEMU end Kernel panic - not sysncing: VFS: Unable to mount toor fs on unknown

Connor Kuehl cipkuehl at gmail.com
Wed Jun 19 18:52:12 EDT 2019

On Wed, Jun 19, 2019 at 10:47 AM Manuel Quintero Fonseca <manuel at uas.edu.mx>

> Hello, I have been wanting to learn how to use QEMU for the development of
> the linux kernel, at the kernelnewbies.org page I did not find any
> information, in google I found this page:
> https://www.collabora.com/news-and-blog/blog/2017/01/16/setting-up-qemu-kvm-for-kernel-development/
> Following the first examples, it gives me two problems, I hope you can
> guide me.
> $qemu-system-x86_64 -kernel /boot/vmlinuz-`uname -r`
> end Kernel panic - not sysncing: VFS: Unable to mount toor fs on
> unknown-block(0,0)
> aku at openSUSE:~> sudo qemu-system-x86_64 -kernel /boot/vmlinuz-`uname -r`
> [sudo] password for root:
> Unable to init server: Could not connect: Connection refused

Hi Manuel,

This is because you're not supplying it with a root file system. The
article you linked goes on to describe this process, but I've found this
blog post[1] to be a bit more concise and easy to follow. It'll show you
how to use "mkinitramfs" to make a ramdisk to pass to QEMU alongside the
kernel you're trying to boot.

Good luck!



> Thank you
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