Hi, It looks that Xen support for crash have not been maintained since 2009. I am trying to fix this. Here it is small bundle of fixes: - xen: Always calculate max_cpus value, - xen: Read only crash notes for onlined CPUs, - x86/xen: Read variables from dynamically allocated per_cpu data, - xen: Get idle data from alternative source, - xen: Read data correctly from dynamically allocated console ring too. Daniel