mjhjmtu

It goes wrong when I reboot my CentOS7.0 system, after executing yum update -y kernel and selecting the latest kernel version during rebooting.

Executing yum update -y kernel command, the kernel version like below:

current kernel version is 3.10.0-514.el7.x86_64, and the latest version is 3.10.0-693.2.2.el7.x86_64,

After executing reboot command, I select the first kernel (the latest version),

but it goes wrong, wrong details like below:

wn-block(0,0) 
CPU: 0 PID: 1 Comm: swapper/0 Not tained 3.10.0-693.2.2.el7.x86_64 
Hadware name: ... 
Call trace:
...
Kernel Offset: disables

My CentOS version is 7.0, and it was installed basing on VirtualBox.Why does it go wrong?

I have solved the problem, if you want to upgrade your CentOS kernel, you must excute following steps:

• excuting yum install -y kernel or yum update -y kernel command;




• excuting vi /etc/default/grub command, set GRUB_DEFAULT=0, it means that the first kernel will be default kernel;




• excuting grub2-mkconfig -o /boot/grub2/grub.cfg command(CentOS 7.0 version), it aimes to generate a new kernel configuration;




• reboot your system;

Maybe I use this method just in my case, someone who have a good method can add a comment at bellow, thanks.