linux-kernel - Bisected 3.9 regression: Corrupted low memory (x86, mm: Move reserving low memory later in initialization)

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Date:	Fri, 16 May 2014 07:29:17 +0200
From:	Rafał Miłecki <zajec5@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Bisected 3.9 regression: Corrupted low memory (x86, mm: Move
 reserving low memory later in initialization)

Hello,

Sorry for the late report, this bug appears on my old notebook I don't
commonly use. Anyway, I've noticed following problem when using
3.15-rc1:

Corrupted low memory at ffff88000000be98 (be98 phys) = b02a000400000000
(...)
Memory corruption detected in low memory
(...)
Corrupted low memory at ffff88000000be98 (be98 phys) = b02a000400000000
Corrupted low memory at ffff88000000be98 (be98 phys) = b02a000400000000
Corrupted low memory at ffff88000000be98 (be98 phys) = b02a000400000000
Corrupted low memory at ffff88000000be98 (be98 phys) = b02a000400000000
Corrupted low memory at ffff88000000be98 (be98 phys) = b02a000400000000
Corrupted low memory at ffff88000000be98 (be98 phys) = b02a000400000000
Corrupted low memory at ffff88000000be98 (be98 phys) = b02a000400000000
Corrupted low memory at ffff88000000be98 (be98 phys) = b02a000400000000

It has appeared to be a regression introduced in 3.9 by the following commit:

commit 95c9608478d639dcffc14ea47b31bff021a99ed1
Author: H. Peter Anvin <hpa@...or.com>
Date: Thu Feb 14 14:02:52 2013 -0800

    x86, mm: Move reserving low memory later in initialization

Attached are dmesgs from 95c9608 and ff52c3b (one commit earlier).

I'm not sure if that matters, but I already got problems with
reserving low memory on this notebook, it was *many* years ago and was
tracked in: https://bugzilla.kernel.org/show_bug.cgi?id=11313

Let me know if I can help any further.

-- 
Rafał

View attachment "95c9608478d639dcffc14ea47b31bff021a99ed1.dmesg.txt" of type "text/plain" (68105 bytes)

View attachment "ff52c3b02b3f73178bfe0c219cd22abdcb0e46c3.dmesg.txt" of type "text/plain" (65983 bytes)