[Xen-devel] incorrect layout of globals from head_64.S during kexec boot

Jan Beulich JBeulich at suse.com
Fri Jul 6 04:29:15 EDT 2012

>>> On 05.07.12 at 23:06, Olaf Hering <olaf at aepfle.de> wrote:
> My question is: were to put additional debug to trace the copying of the
> data section to its final destination? Is this a task of kexec -l or
> does that happen during decompressing? I suspect the latter. This is the
> console output before the crash (the crash happens in 'movq %rax, %cr3'):
> ...
> [   44.072548] Starting new kernel
> I'm in purgatory
> early console in decompress_kernel
> Decompressing Linux... Parsing ELF... done.

According to this, I'd first of all extend the printing done on
arch/x86/boot/compressed/misc.c:parse_elf(). One possible
problem (without much looking at how the individual address
ranges get determined) could be overlapping memory ranges
in the call to memcpy() inside the loop.


More information about the kexec mailing list