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 D99D6EB64DC for ; Mon, 17 Jul 2023 21:34:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E77506B0072; Mon, 17 Jul 2023 17:34:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E27DF6B0074; Mon, 17 Jul 2023 17:34:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D16378D0001; Mon, 17 Jul 2023 17:34:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id BFEAB6B0072 for ; Mon, 17 Jul 2023 17:34:35 -0400 (EDT) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 8593FB0C4F for ; Mon, 17 Jul 2023 21:34:35 +0000 (UTC) X-FDA: 81022408110.02.BEDD1AC Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) by imf17.hostedemail.com (Postfix) with ESMTP id 755FA4000B for ; Mon, 17 Jul 2023 21:34:33 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=mit.edu header.s=outgoing header.b=AhYp6FG0; dmarc=pass (policy=none) header.from=mit.edu; spf=pass (imf17.hostedemail.com: domain of tytso@mit.edu designates 18.9.28.11 as permitted sender) smtp.mailfrom=tytso@mit.edu ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1689629673; 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=AIJ7eQlGnPTeVEA7EYFHb4RQbDLObtg4FWLQb0yKeA0=; b=gNTVHVgo3DRW5FPOR6eA6/UydsOikJaEPuWvUMd7FlbOzUwUX1nppH3577u62wQedmVcdn hAA2BopxaaVNfX4PF0llTDg6B89w85rRJusSZM9RCzVvgJp4ue4HOKlOhVQFKQmRIqx13m RDToalVURMYtTR57qFrlORauE0I+kyA= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=mit.edu header.s=outgoing header.b=AhYp6FG0; dmarc=pass (policy=none) header.from=mit.edu; spf=pass (imf17.hostedemail.com: domain of tytso@mit.edu designates 18.9.28.11 as permitted sender) smtp.mailfrom=tytso@mit.edu ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1689629673; a=rsa-sha256; cv=none; b=yvgiUa/UHRAzdyNPAgTwiv96fQBO30IuZIAa9otwsJI0kxckDBtVjWNiy7sETvcoRbuFD1 N0TbTuqvXED2ur4wXAwcxdAN9NVvuFMU+IEcANxIC9cHv0eFBWCwz7KiZIiSaQoWUnrcPQ zsJQAU+qdFtSERXHvNxF6bsW8GKNeQo= Received: from cwcc.thunk.org (pool-173-48-116-181.bstnma.fios.verizon.net [173.48.116.181]) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 36HLYOe4023106 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Jul 2023 17:34:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mit.edu; s=outgoing; t=1689629668; bh=AIJ7eQlGnPTeVEA7EYFHb4RQbDLObtg4FWLQb0yKeA0=; h=Date:From:Subject:Message-ID:MIME-Version:Content-Type; b=AhYp6FG0XJz9UMdyC87+MA7F7E0+jqJEAN9UIBRE/YiWHYr7aES6PPKEIOwFeUmyx etZXfRnpfgavY+1dnsZmq6ey06zngeSKKYCUXfV3KHc49kBmgHU2zJT5LBD2WD5ZZZ AlTszUt4smZI1XFRhjiB8T7q1QepJ83222jdYOJsZk6umyUYQvVDQRtc32b2P3QonV IXKs7gUjMpbjdbpdx0y/tnHYMpERKfD0qBl8LBDTNW4wpiofms4HJqy9y2wmu3Z4+C ZKJi54xm2h8bE++9tWGmppPwIVElkGSNyHp166KSRlNXytYHG+9h4HIQDCmF/ov2DS lGV8oz6wVf/QA== Received: by cwcc.thunk.org (Postfix, from userid 15806) id 809FC15C026A; Mon, 17 Jul 2023 17:34:24 -0400 (EDT) Date: Mon, 17 Jul 2023 17:34:24 -0400 From: "Theodore Ts'o" To: Ritesh Harjani Cc: Naresh Kamboju , open list , linux-mm , lkft-triage@lists.linaro.org, linux-ext4 , LTP List , Andrew Morton , Arnd Bergmann , Dan Carpenter , Andreas Dilger , Ojaswin Mujoo Subject: Re: next: kernel BUG at fs/ext4/mballoc.c:4369! Message-ID: <20230717213424.GB3842864@mit.edu> References: <87o7kbnle9.fsf@doe.com> <87jzuyobch.fsf@doe.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87jzuyobch.fsf@doe.com> X-Rspam-User: X-Stat-Signature: ncjpmjmun4xgcrdneu4ymd3gxz9w5jpw X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 755FA4000B X-HE-Tag: 1689629673-727903 X-HE-Meta: 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 NG5yBS6p 1NmwFdD+4qPBzCKpHobKxwqN2YCVTEOCzKrmael+XNTZyNb253k59v8OB9L0arRfd6GYGJpH/eBtumDklcj3noUx0LEyzHDVNJXQpjfdY5OGWlDMTRBuoW+LOAyTi2ZsWZN3vaSJOc5H+/jo8A0dnsnV9Eb/EAMjGedSoMLqr56u5HxHySMBIfiS9JvYsXzHxKYf9ddTk15HnaqaHJJ5Me5cO8YfsIXJETAXjVLpnFcye6vP6QTOzjF2FYYm56F/4ThmqF1Muai1BUbNhVfdHYNd/+A== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Jul 17, 2023 at 08:04:54PM +0530, Ritesh Harjani wrote: > > These can basically trigger in extremely low memory space and only when > such ranges exist in the PA rbtree. Hence, I guess it is a little hard > to tigger race. Ritesh, thanks for looking into this! Naresh, how easy is it for you to trigger the BUG when using LTP? I did two xfstests runs using "gce-xfstests -c ext2/default -g auto", one on the ext4 dev branch, and one on linux-next 20230717, and I wasn't able to trigger the BUG. If you can trivially trigger it using LTP (perhaps with a low memory configuration in your test setup?), that would be useful to know. Cheers, - Ted