After a yum update on a Red Hat VM, hosted on a hyper-v environment. You might run into an issue where on boot, the system kernel panics.
This was observed when the update brought the RH system from RH less then 6.5 to 6.5+.
Should this occur you can try the following:
- Boot system into previous kernel using the menu at boot
- go into the /boot directory
- backup the newest kernel: cp initramfs-2.6.32-642.el6.x86_64.img initramfs-2.6.32-642.el6.x86_64.img.$(date +%m-%d-%H%M%S).bak
- Uninstall the hyper-v packages: yum remove kmod-microsoft-hyper-v microsoft-hyper-v
- rebuild the kernel (updated) dracut -f initramfs-2.6.32-642.el6.x86_64.img 2.6.32-642.el6.x86_64
- reboot the system
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