Re: [PATCH] Revert "x86-64, init: Do not set NX bits on non-NX capablehardware"

[H. Peter Anvin]

On 05/20/2013 11:18 AM, Linus Torvalds wrote:
> On Mon, May 20, 2013 at 11:13 AM, H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> wrote:
>>
>> Indeed.  Looks like we corrupt a random bit in memory on resume.
> 
> Well, in this case, it's probably the DEBUG_PAGEALLOC that Michal has
> enabled, which causes a page fault - and then a triple fault - at
> secondary CPU startup. And the triple fault then results in a reboot.
> Which explains the symptoms he gets.
> 
> Without DEBUG_PAGEALLOC it ends up being "just" a single-bit corruption, yes.
> 

Good, that explains what made it predictable.  Score one for
DEBUG_PAGEALLOC.

	-hpa


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