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Issue
Upgrading kernel(s) inside Linux guests to the following versions will break them. Updated guest(s) won’t ever boot and will crash on startup.
Environment
Compute resource - XEN
CentOS 6.x kernel version >= 2.6.32-754.2.1.el6.x86_64
Debian 9.x kernel version >= 4.9.0-7-amd64
Resolution
The issue can be fixed in one of the following ways:
1. Skip the recent kernel while updating the guest's packages:
- Update CentOS 6.x with:
# yum update --exclude=kernel*2.6.32-754.2.1*
- Update Debian 9.x with:
# apt-mark hold linux-image-amd64 linux-headers-amd64
# apt-get update
# apt-get dist-upgrade
2. After the kernel was updated, add the following kernel options to the GRUB boot loader configuration file:
- For CentOS 6.x, add eagerfpu=off option to edit /boot/grub/grub.conf file
- For Debian 9.x, add elevator=noop and pti=off options to edit /boot/grub/menu.lst file.