After successfully modifying kexec-tools to get it to load a crashkernel on a standard 32 bit linux 3.10.17 kernel, I tried to get it to load the same crashkernel on the same 32 bit linux kernel running under xen 4.4.0, but get the error "Cannot load <kernel-path>". I've patched the code to include some diagnostics, and the problem is caused by add_memmap() reporting that it's been called with overlapping memory. It's called twice, the first time it's called with: address: 0x00000000 size: 0x0009f800 type: 0 This comes from info->backup_src_* The second time it is passed address: 0x00000000 size: 0x00000000 type: 0 This is derived from the crash_reserved_mem[] array, which has one element with the values: start: 0x0000000000000000 (16 0's) end: 0xffffffffffffffff (16 f's) The problem isn't caused by the zero size because the maths in add_memmap, uses size to calculate end which overflows back again, and (partially) cancels out the error. The problem is caused by the two memory blocks being based at 0x0, causing the blocks to overlap. I'm not sure what the correct functionality should be. Thanks, Anthony. -- Founder, Overnet Data Ltd +44-1604-807545 www.overnetdata.com
