The makedumpfile command, used to manually trigger a vmcore dump file is documented to support dump levels from 0 to 31 using the -d switch. Notably, the manual page states that it is possible to specify a value higher than 1 on an x86_64 machine running the Xen hypervisor. This is not the case for Oracle VM Server. Only the values 0 and 1 can be specified for this parameter, or a vmcore file is not generated.

Workaround: There is no workaround. Only use dump levels of 0 or 1 if using the makedumpfile command.

Bug 22329501