[openstack-dev] [Openstack] [Nova] Havana virtio_blk | kvm, kernel panic on VM boot

Ben Nemec openstack at nemebean.com
Wed Mar 26 16:17:31 UTC 2014

This is a development list and your question sounds like a usage one. 
Please try asking on the users list: 



On 03/26/2014 04:24 AM, saurabh agarwal wrote:
> I have compiled a new linux kernel with CONFIG_VIRTIO_BLK=y. But it
> doesn't boot and kernel panics. To kernel command line i tried passing
> root=/dev/vda and root=/dev/vda1 but same kernel panic comes every time.
> VIRTIO_NET was working fine when VIRTIO_BLK was not enabled and VM
> booted up fine. But with virtio-blk i see the below kernel panic. Can
> someone please suggest what could be going wrong?
> VFS: Cannot open root device "vda" or unknown-block(253,0)^M
> Please append a correct "root=" boot option; here are the available
> partitions:^M
> fd00         8388608 vda  driver: virtio_blk^M
>    fd01         7340032 vda1 00000000-0000-0000-0000-000000000000^M
>    fd02          512000 vda2 00000000-0000-0000-0000-000000000000^M
>    fd03          535552 vda3 00000000-0000-0000-0000-000000000000^M
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(253,0)^M
> Regards,
> Saurabh
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