Hi! I'm having problems getting kdumps from my relocatable kernel (2.6.31-8) working with crash on a IA-32 board. I use makedumpfile to generate a compressed dump, and when I try to load it with crash I get ./crash vmlinux vmcore --reloc=0x100000 crash: invalid kernel virtual address: 98 type: "present" WARNING: cannot read cpu_present_map crash: invalid kernel virtual address: 908bd975 type: "online" WARNING: cannot read cpu_online_map crash: cannot determine base kernel version crash: vmlinux and vmcore do not match! specifying --reloc also fails: ./crash vmlinux vmcore --reloc=0x100000 crash: seek error: kernel virtual address: c01a2108 type: "cpu_possible_mask" So I started looking into the code and found something which looks like a typo in relocate() (patch below). Changing this makes crash work for me. Great tool by the way, leaves you longing for the next kernel panic ;-) // Simon --- orig-crash-4.1.2/symbols.c 2009-12-09 21:37:40.000000000 +0100 +++ crash-4.1.2/symbols.c 2009-12-17 16:03:24.000000000 +0100 @@ -671,7 +671,7 @@ relocate(ulong symval, char *symname, in break; } - return (symval - kt->relocate); + return (symval + kt->relocate); } /*