On Friday, 24 of October 2008, H. Peter Anvin wrote:

Ingo Molnar wrote:

quoted

* Gleb Natapov [off-list ref] wrote:

quoted

Hi,

S3 sleep no longer works on x86_64 (at least in KVM, but it looks like 
this is the kernel bug). Kernel 2.6.26 works. I think that the commit 
that caused the problem is a939098af, but I can't be 100% sure since 
compilation is broken at this point.

Triple fault happens during S3 resume. It happens in 
arch/x86/kernel/head_64.S during access to GDT after it was loaded on 
line 213 (lgdt early_gdt_descr(%rip)) early_gdt_descr points to 
per_cpu__gdt_page and this address contains valid GDT entries during a 
regular boot, but on S3 resume in contains garbage. It seems that 
per_cpu area is reallocated somewhere, but I don't understand this 
magic enough to fix it. Can somebody look at this and explain what 
happens?

could you check whether the (post-v2.6.27) upstream fix below does the 
trick for you?

	Ingo

From 3038edabf48f01421c621cb77a712b446d3a5d67 Mon Sep 17 00:00:00 2001
From: Rafael J. Wysocki <redacted>
Date: Fri, 17 Oct 2008 01:26:27 +0200
Subject: [PATCH] x86 ACPI: fix breakage of resume on 64-bit UP systems with SMP kernel

x86 ACPI: Fix breakage of resume on 64-bit UP systems with SMP kernel

Is this patch scheduled for 2.6.27-stable?  If not, it sounds like it 
should be.

It is. :-)

Thanks,
Rafael