From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754066AbbCPMQG (ORCPT ); Mon, 16 Mar 2015 08:16:06 -0400 Received: from mta-out1.inet.fi ([62.71.2.195]:48276 "EHLO jenni2.inet.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750936AbbCPMQE (ORCPT ); Mon, 16 Mar 2015 08:16:04 -0400 Date: Mon, 16 Mar 2015 14:15:59 +0200 From: "Kirill A. Shutemov" To: Christian Borntraeger Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm: trigger panic on bad page or PTE states if panic_on_oops Message-ID: <20150316121559.GB20546@node.dhcp.inet.fi> References: <1426495021-6408-1-git-send-email-borntraeger@de.ibm.com> <20150316110033.GA20546@node.dhcp.inet.fi> <5506BAB6.3080104@de.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5506BAB6.3080104@de.ibm.com> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 16, 2015 at 12:12:54PM +0100, Christian Borntraeger wrote: > Am 16.03.2015 um 12:00 schrieb Kirill A. Shutemov: > > On Mon, Mar 16, 2015 at 09:37:01AM +0100, Christian Borntraeger wrote: > >> while debugging a memory management problem it helped a lot to > >> get a system dump as early as possible for bad page states. > >> > >> Lets assume that if panic_on_oops is set then the system should > >> not continue with broken mm data structures. > > > > bed_pte is not an oops. > > I know that this is not an oops, but semantically it is like one. I certainly > want to a way to hard stop the system if something like that happens. > > Would something like panic_on_mm_error be better? Or panic_on_taint= where is bit-mask of TAINT_* values. The problem is that TAINT_* will effectevely become part of kernel ABI and I'm not sure it's good idea. Oopsing on any taint will have limited usefulness, I think. -- Kirill A. Shutemov