[CentOS-virt] Kernel 3.18.21-17 and 3.18.21-18 kernel panics

Mon Feb 22 12:39:51 UTC 2016
George Dunlap <dunlapg at umich.edu>

On Mon, Feb 22, 2016 at 6:35 AM, Sarah Newman <srn at prgmr.com> wrote:
> On 02/21/2016 08:02 PM, Shaun Reitan wrote:
>> I've seen this issue on about 15 different servers now. Anybody else seeing this?
>> Screenshot: http://imgur.com/cBcwr8l
>> I also have a video of the boot process if that will be helpful.
> Are you missing the initrd line in /boot/grub/menu.lst? That's a known bug that I believe has been fixed with 3.18.25-something.

"Can't find rootfs" is most likely the missing initrd bug, which is
fixed in centos-release-xen-7-12 or later.

You can:

1. Manually add the initrd line to the xen stanza in /boot/grub/menu.lst, or

2. Upgrade to centos-release-xen-7-12 or later, and then

 2a. Run grub-bootxen.sh manually, or

 2b. Update the kernel (which will cause grub-bootxen.sh to be run