From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD553C433E0 for ; Wed, 10 Feb 2021 16:48:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A0D464DDF for ; Wed, 10 Feb 2021 16:48:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232981AbhBJQrz (ORCPT ); Wed, 10 Feb 2021 11:47:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:34670 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232908AbhBJQrR (ORCPT ); Wed, 10 Feb 2021 11:47:17 -0500 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6681564DDF; Wed, 10 Feb 2021 16:46:35 +0000 (UTC) Date: Wed, 10 Feb 2021 11:46:33 -0500 From: Steven Rostedt To: Tetsuo Handa Cc: Timur Tabi , Petr Mladek , Sergey Senozhatsky , Vlastimil Babka , Andy Shevchenko , Matthew Wilcox , akpm@linux-foundation.org, Linus Torvalds , roman.fietze@magna.com, Kees Cook , John Ogness , akinobu.mita@gmail.com, glider@google.com, Andrey Konovalov , Marco Elver , Rasmus Villemoes , Pavel Machek , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 0/3][RESEND] add support for never printing hashed addresses Message-ID: <20210210114633.1b755f6e@gandalf.local.home> In-Reply-To: References: <20210210051814.845713-1-timur@kernel.org> <6da0be5a-7cb0-4943-e61f-7c3275e60cb6@i-love.sakura.ne.jp> <20210210111836.2468f10a@gandalf.local.home> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 11 Feb 2021 01:39:41 +0900 Tetsuo Handa wrote: > On 2021/02/11 1:18, Steven Rostedt wrote: > > The point of this exercise is to be able to debug the *same* kernel that > > someone is having issues with. And this is to facilitate that debugging. > > That's too difficult to use. If a problem is not reproducible, we will have > no choice but always specify "never hash pointers" command line option. If a > problem is reproducible, we can rebuild that kernel with "never hash pointers" > config option turned on. Now the question is, why do you need the unhashed pointer? Currently, the instruction pointer is what is fine right? You get the a function and its offset. If there's something that is needed, perhaps we should look at how to fix that, instead of just unhashing all pointers by default. -- Steve