1. Release Notes for Unbreakable Enterprise Kernel Release 4 Update 7
  2. Known Issues
  3. KVM guests with less than 4 GB of memory might fail to auto reserve crash kernel memory

KVM guests with less than 4 GB of memory might fail to auto reserve crash kernel memory

KVM guests that are running UEK R4 might fail to auto reserve memory for a crash kernel if the crashkernel=auto setting is used on a guest with less than 4 GB of physical memory.

To prevent this problem from occurring on KVM guests with less than 4 GB of physical memory, you can reserve memory for a crash kernel by explicitly requesting a reservation size, for example, crashkernel=128M. (Bug ID 26933217)