Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu area
- From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
- Date: Tue, 01 Jul 2008 10:26:53 -0700
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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