Re: [Resend][PATCH] x86/power/64: Always create temporary identity mapping correctly

On Tue, 9 Aug 2016, Jiri Kosina wrote:

quoted

210e7a43fa90 mm: SLUB freelist randomization
7c00fce98c3e mm: reorganize SLAB freelist randomization
4ff5308744f5 x86/mm: Do not reference phys addr beyond kernel
90397a417796 x86/mm: Add memory hotplug support for KASLR memory randomization
a95ae27c2ee1 x86/mm: Enable KASLR for vmalloc memory regions
021182e52fe0 x86/mm: Enable KASLR for physical mapping memory regions

Okay, I did one-by-one reverts, and the one above, i.e.

	commit 021182e52fe01c1f7b126f97fd6ba048dc4234fd
	Author: Thomas Garnier [off-list ref]
	Date:   Tue Jun 21 17:47:03 2016 -0700

	    x86/mm: Enable KASLR for physical mapping memory regions

is the one that is the culprit on my machine. With this one reverted, 
resume hibernation doesn't reboot (tripple fault?), but proceeds 
succesfully.

As discussed with Rafael privately, I also tried this very patch 
(x86/power/64: Always create temporary identity mapping correctly) on top 
of the reverted revert of 021182e52fe01c1f7b1 (see the full log below), 
but such kernel triple faults on resume as well.

87c38d2 x86/power/64: Always create temporary identity mapping correctly
3cb504a Revert "Revert "x86/mm: Enable KASLR for physical mapping memory regions""
758850d Revert "x86/mm: Enable KASLR for physical mapping memory regions"
4a02dfb Revert "x86/mm: Enable KASLR for vmalloc memory regions"
037863f Revert "x86/mm: Add memory hotplug support for KASLR memory randomization"
3416a21 Revert "x86/mm: Do not reference phys addr beyond kernel"
69227be Revert "mm: reorganize SLAB freelist randomization"
a1d8d71 Revert "mm: SLUB freelist randomization"

IOW, 021182e52f introduces a bug for which there is no existing fix yet.

-- 
Jiri Kosina
SUSE Labs