CentOS Not Bootable after Install Kernel-devel rpm


OS unbootable and show the following message:

Kernel panic – not syncing: VFS: Unable to mount root fs on unknown-block(0,0)


  • At waiting to boot loader
  • click any key to access the boot kernel menu
  • Select previous kernel version other than the default latest installed one


  • CentOS    6.4
  • Kernel      2.6.32-431.


Upon upgrading the kernel or installed the kernel-devel packages, the system was still running the current kernel until next system reboot. In case, the reboot schedule was long after this kernel-devel, it is not easy to remember kernel-devel was installed and as a side effect also upgraded the kernel.