Hi Dave, Please include this patch in the next crash release: The new z10 System z (s390x) machines have now support for large pages (1MB). This patch updates the s390x page table walk function in order to handle this. Signed-off-by: Michael Holzheu <holzheu(a)linux.vnet.ibm.com&gt; --- s390x.c | 5 +++++ 1 files changed, 5 insertions(+) diff -Naurp crash-4.0-6.2/s390x.c crash-4.0-6.2-s390x-large-page/s390x.c --- crash-4.0-6.2/s390x.c 2008-04-11 14:42:35.000000000 +0200 +++ crash-4.0-6.2-s390x-large-page/s390x.c 2008-04-11 14:42:41.000000000 +0200 @@ -337,6 +337,11 @@ int s390x_vtop(ulong table, ulong vaddr, level--; } + /* Check if this is a large page. */ + if (entry & 0x400ULL) + /* Add the 1MB page offset and return the final value. */ + return table + (vaddr & 0xfffffULL); + /* Get the page table entry */ entry = _kl_pg_table_deref_s390x(vaddr, entry & ~0x7ffULL); if (!entry)