The kexec/arch/x86_64/crashdump-x86_64.h file contains a stale PAGE_OFFSET value. In 2.6.27 it was changed from 0xffff810000000000UL to 0xffff880000000000UL. This is only a problem when using gdb with the vmlinux/vmcore pair, because gdb relies upon the PT_LOAD segment's p_vaddr values in the ELF header to be correct. Anyway, in the RHEL6 kexec-tools, this simple patch was made: -#define PAGE_OFFSET 0xffff810000000000UL +#define PAGE_OFFSET 0xffff880000000000UL which is OK since the RHEL6 version of kexec-tools will only be used with RHEL6 kernels. But for backwards compatibility, the better way to do it would be to check the utsname of the running kernel, and use the right value. But again, this is only required for gdb usage. The crash utility (and makedumpfile) make kernel version checks to determine which x86_64 PAGE_OFFSET value is applicable, and don't rely on the ELF header p_vaddr values for the unity-mapped regions. Dave Anderson
