Newer Xen versions (at least 4.2) use crash_notes array instead of per_cpu__crash_notes. Take into account that. Signed-off-by: Daniel Kiper <daniel.kiper(a)oracle.com&gt; diff -Npru crash-6.1.0.orig/xen_hyper.c crash-6.1.0/xen_hyper.c --- crash-6.1.0.orig/xen_hyper.c 2012-09-27 21:19:15.000000000 +0200 +++ crash-6.1.0/xen_hyper.c 2012-11-12 15:56:17.000000000 +0100 @@ -645,15 +645,22 @@ xen_hyper_dumpinfo_init(void) error(FATAL, "cannot malloc dumpinfo table context_xen_core_array space.\n"); } BZERO(xhdit->context_xen_core_array, size); - addr = symbol_value("per_cpu__crash_notes"); + if (symbol_exists("per_cpu__crash_notes")) + addr = symbol_value("per_cpu__crash_notes"); + else + get_symbol_data("crash_notes", sizeof(ulong), &addr); for (i = 0; i < machdep->get_smp_cpus(); i++) { ulong addr_notes; - addr_notes = xen_hyper_per_cpu(addr, i); + if (symbol_exists("per_cpu__crash_notes")) + addr_notes = xen_hyper_per_cpu(addr, i); + else + addr_notes = addr + i * STRUCT_SIZE("crash_note_range_t") + + MEMBER_OFFSET("crash_note_range_t", "start"); if (xhdit->note_ver == XEN_HYPER_ELF_NOTE_V4) { if (!readmem(addr_notes, KVADDR, &(xhdit->context_array[i].note), - sizeof(ulong), "per_cpu__crash_notes", RETURN_ON_ERROR)) { - error(WARNING, "cannot read per_cpu__crash_notes.\n"); + sizeof(ulong), "crash_notes", RETURN_ON_ERROR)) { + error(WARNING, "cannot read crash_notes.\n"); return; } } else { @@ -678,7 +685,7 @@ xen_hyper_dumpinfo_init(void) xhdit->xen_info_cpu = samp_cpuid; if (!xen_hyper_fill_elf_notes(xhdit->context_array[samp_cpuid].note, buf, XEN_HYPER_ELF_NOTE_FILL_T_NOTE)) { - error(FATAL, "cannot read per_cpu__crash_notes.\n"); + error(FATAL, "cannot read crash_notes.\n"); } bp = buf;