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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id BA68DC433FE for ; Thu, 10 Nov 2022 04:40:56 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 0141F6B0071; Wed, 9 Nov 2022 23:40:56 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id F064C6B0072; Wed, 9 Nov 2022 23:40:55 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DF5046B0074; Wed, 9 Nov 2022 23:40:55 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id CEEF66B0071 for ; Wed, 9 Nov 2022 23:40:55 -0500 (EST) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 9407281418 for ; Thu, 10 Nov 2022 04:40:55 +0000 (UTC) X-FDA: 80116282470.03.6A1ED4A Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) by imf08.hostedemail.com (Postfix) with ESMTP id CA339160009 for ; Thu, 10 Nov 2022 04:40:54 +0000 (UTC) Received: from letrec.thunk.org ([12.139.153.3]) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 2AA4eDSA015823 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 9 Nov 2022 23:40:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mit.edu; s=outgoing; t=1668055221; bh=qahc/OEJv9l/mG+aZHuyYNKbJOQinUkMTYXdNij93nY=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=H3rKGqs0uCOsyfC9KYcBFj5CT1PnOFkol1Da9cLF93kcK4GjWwIb4VNfWJdesVNEg Cdr9oSbhuRVO8ki8qwPUuKnBpCxQJsfpFkddNmkJJ+9d+C1uC/z2KZlpFGAe8ek/sS kZ3npSqLafM+NPI4uSE2a5ppEmJuC0I7Hpo5Ov8C5WTOFXTpBpvT5OHsepFbSe3VVW IiPKzfvHAVUhHpZX0J833tJat9qVPGbbHQ4s4IEHM85S9VYCUuNRCQ6oE5o2SZbSm2 F58yi2GCow4Dq7RALHQ7lJ3aOoxRkYTHqz9N25O+TJ/F0ft0CiTT+/V6Zc/hML1stF tjRfXross+zlw== Received: by letrec.thunk.org (Postfix, from userid 15806) id 38BDE8C01E8; Wed, 9 Nov 2022 23:40:13 -0500 (EST) Date: Wed, 9 Nov 2022 23:40:13 -0500 From: "Theodore Ts'o" To: Aaro Koskinen Cc: Linus Torvalds , Paul Cercueil , vbabka@suse.cz, 42.hyeyoo@gmail.com, akpm@linux-foundation.org, catalin.marinas@arm.com, cl@linux.com, iamjoonsoo.kim@lge.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, penberg@kernel.org, rientjes@google.com, rkovhaev@gmail.com, roman.gushchin@linux.dev, willy@infradead.org Subject: Re: Deprecating and removing SLOB Message-ID: References: <20221109234832.GE307514@darkstar.musicnaut.iki.fi> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221109234832.GE307514@darkstar.musicnaut.iki.fi> ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1668055255; a=rsa-sha256; cv=none; b=Nj2bJXe8DbRRGsSaJZqcRaPs9fxW9bpF4sYDcKwiX5Xcyj2QWYqUbri/N9mZPFILrszNQh gUB5EfU879x1nyBiKkJcUHArpKavkNOzA0DVMVyV79VJ9XvDY2SPXw3te9LUoVV7i2zXp6 qpyfE9ckT8MY8pw66qYeqQbdArrvgMY= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=fail ("headers rsa verify failed") header.d=mit.edu header.s=outgoing header.b=H3rKGqs0; spf=pass (imf08.hostedemail.com: domain of tytso@mit.edu designates 18.9.28.11 as permitted sender) smtp.mailfrom=tytso@mit.edu; dmarc=pass (policy=none) header.from=mit.edu ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1668055255; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=qahc/OEJv9l/mG+aZHuyYNKbJOQinUkMTYXdNij93nY=; b=Td214HP8AC+m4SgBeI3PQ1QgAvsk7GsmiJZ/bxA9OTiSgzmWJ3z7d7Q4d1Joh8ii+732P2 1GC1czk4TzBPhjTTZZJDUQDgFcqqFu6cE5eXFwzkAiHryQ9o3XESWhqdvTqWKGSnnlqwYI 5tQ3elnKjQoapgd7hUk7dHb97Ra3e9M= X-Stat-Signature: 97azbdd99jjn9a4wbprofmcjntj9c6q3 X-Rspamd-Queue-Id: CA339160009 Authentication-Results: imf08.hostedemail.com; dkim=fail ("headers rsa verify failed") header.d=mit.edu header.s=outgoing header.b=H3rKGqs0; spf=pass (imf08.hostedemail.com: domain of tytso@mit.edu designates 18.9.28.11 as permitted sender) smtp.mailfrom=tytso@mit.edu; dmarc=pass (policy=none) header.from=mit.edu X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1668055254-545096 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Nov 10, 2022 at 01:48:32AM +0200, Aaro Koskinen wrote: > > Some of the reported SLOB issues have been actually real driver bugs, > that go unnoticed when SLUB/SLAB are used (unless perhaps debug stuff > is enabled). I'm not saying kernel should keep SLOB, but it's good at > failing early when there is a bug. See e.g. commit 120ee599b5bf ("staging: > octeon-usb: prevent memory corruption") Out of curiosity, are these bugs that would have been found using KASAN or some of the other kernel sanitizers and/or other debugging tools we have at our disposal? - Ted