1. Release Notes for Unbreakable Enterprise Kernel Release 5 Update 2
  2. Known Issues
  3. KVM guest crashes when using memory hotplug operation to shrink available memory

KVM guest crashes when using memory hotplug operation to shrink available memory

A KVM guest may crash if the guest memory is reduced from 96GB or more to 2GB using a memory hotplug operation. Although this issue is logged for UEK R5, similar issues have been noted for RHCK. The issue is expected behavior and relates to the how memory ballooning works. Shrinking guest memory in large amounts can result in Out Of Memory (OOM) conditions and processes are killed automatically, if the memory shrinks to below the amount that is in use by the guest operating system at the time. (Bug ID 27968656)