Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpuarea

[Jeremy Fitzhardinge]

H. Peter Anvin wrote:
> Eric W. Biederman wrote:
> > > The zero-based PDA mechanism requires the introduction of a new ELF 
> > > segment
> > > based at vaddr 0 which is sufficiently unusual that it wouldn't 
> > > surprise me if
> > > its triggering some toolchain bug.
> >
> > Agreed.  Given the previous description my hunch is that the bug is 
> > occurring
> > during objcopy.  If vmlinux is good and the compressed kernel is bad.
>
> Actually, it's not all that unusual... it's pretty common in various 
> restricted environments.  That being said, it's probably uncommon for 
> *64-bit* code.

Well, it's also unusual because 1) it's vaddr 0, but paddr <high>, and 
2) the PHDRs are not sorted by vaddr order.  2) might actually be a bug.

   J
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