Hi Dave, Crash was stopped with following messages when I try to treat very small dump image. It was caused in vmalloc_start initialise when vmalloc is not used (vmlist == 0). This patch return address 0 for this case. > <readmem: c02a99a8, KVADDR, "vmlist", 4, (FOE), afdae5f4> > <readmem: 0, KVADDR, "first vmlist addr", 4, (ROE), afdae5f0> > crash: invalid kernel virtual address: 0 type: "first vmlist addr" regards, -- Kazuo Moriwaka <moriwaka@xxxxxxxxxxxxx> --- crash-4.0-2.31.orig/memory.c 2006-06-27 23:15:32.000000000 +0900 +++ crash-4.0-2.31/memory.c 2006-07-10 18:24:54.000000000 +0900 @@ -11049,10 +11049,13 @@ ulong vmlist, addr; get_symbol_data("vmlist", sizeof(void *), &vmlist); - - if (!readmem(vmlist+OFFSET(vm_struct_addr), KVADDR, &addr, - sizeof(void *), "first vmlist addr", RETURN_ON_ERROR)) - non_matching_kernel(); + if (vmlist != 0x0) { + if (!readmem(vmlist+OFFSET(vm_struct_addr), KVADDR, &addr, + sizeof(void *), "first vmlist addr", RETURN_ON_ERROR)) + non_matching_kernel(); + } else { + addr = 0; + } return addr; }