Hello,

current git stable 2.6.32.x (2968b25) crashes on boot with the attached 
debug output. The same config file works perfectly on 2.6.32.18 (e6b9b2c).

I manually created a traceback from the stack dump:

   get_phys_to_machine
   pte_pfn_to_mfn
   xen_make_pgd
   __raw_callee_save_xen_make_pgd
   vmemmap_pgd_populate
   vmemmap_populate
   sparse_mem_map_populate
   sparse_init

Andreas