Although Unbreakable Enterprise Kernel 3 (UEK3) supports the crashkernel=auto boot parameter, this option is not supported by the Xen hypervisor that is used for Oracle VM Server. Attempting to set this parameter results in the following boot errors:
(XEN) crashkernel: memory value expected (XEN) Command line: console=com2,vga com2=57600,8n1 dom0_mem=840M allowsuperpage crashkernel=auto
Dom0 fails to load the kdump service at start-up with the following message:
kdump: No crashkernel parameter specified for running kernel
Workaround: Specify a valid fixed memory range suitable for the server hardware if you choose to use this parameter. For example, crashkernel=256M@64M.
Bug 18174580