Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757771Ab3ETSSS (ORCPT ); Mon, 20 May 2013 14:18:18 -0400 Received: from mail-ve0-f174.google.com ([209.85.128.174]:52901 "EHLO mail-ve0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754856Ab3ETSSR (ORCPT ); Mon, 20 May 2013 14:18:17 -0400 MIME-Version: 1.0 In-Reply-To: <519A67C9.6000709@linux.intel.com> References: <20130514160108.GA5055@dhcp22.suse.cz> <1369062192-7066-1-git-send-email-mhocko@suse.cz> <519A483F.7070400@zytor.com> <20130520164335.GA9441@dhcp22.suse.cz> <519A67C9.6000709@linux.intel.com> Date: Mon, 20 May 2013 11:18:16 -0700 X-Google-Sender-Auth: cf9vdMUO-YjdJctciIvWo0q6YSw Message-ID: Subject: Re: [PATCH] Revert "x86-64, init: Do not set NX bits on non-NX capable hardware" From: Linus Torvalds To: "H. Peter Anvin" Cc: Michal Hocko , "H. Peter Anvin" , =?UTF-8?Q?Fernando_Luis_V=C3=A1zquez_Cao?= , "Rafael J. Wysocki" , "the arch/x86 maintainers" , "linux-pm@vger.kernel.org" , Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 735 Lines: 17 On Mon, May 20, 2013 at 11:13 AM, H. Peter Anvin 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. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/