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[2620:137:e000::1:20]) by mx.google.com with ESMTP id p11-20020a1709066a8b00b006feb0035b59si4416082ejr.178.2022.05.27.09.21.16; Fri, 27 May 2022 09:21:54 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=fail header.i=@mit.edu header.s=outgoing header.b=fWJxbyr1; spf=pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-ext4-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=mit.edu Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243547AbiE0PWI (ORCPT + 99 others); Fri, 27 May 2022 11:22:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234139AbiE0PWH (ORCPT ); Fri, 27 May 2022 11:22:07 -0400 Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AD7F762F5; Fri, 27 May 2022 08:22:04 -0700 (PDT) Received: from cwcc.thunk.org (pool-108-7-220-252.bstnma.fios.verizon.net [108.7.220.252]) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 24RFLis3024874 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 May 2022 11:21:45 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mit.edu; s=outgoing; t=1653664907; bh=yq+iAzud+p1UYdhfLiS74v2PiRi+/nVB9VPSJaqxO+I=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=fWJxbyr1z1tgN5pWOPNUX+Dk2OHchCiA7c0I3zA+10a8bJr35g5pD8fQ6y6cQ26Rh AyZSvE8T1pISSzS2xSq2/mUQ7S+5839CZRjxQwhSWmQTXzvvnjVSrxddvaBbBxoCXD jKdfSODqEVfVlQN85VbXOdg/gFAsYrzWmssR/S/1q1xvOsoGQU+3lhq1qbaSxsj5TK TXZ9XwLP2vfwGtWWLjacIJEx1uKusY3wS/G/BMTcrhRgLavCu3n+ug6vNtzR3eYtAx bN7yZJWIKGdxIx8GieXyNdz7MwOeaS1X3CLQLu8eHl0KjG0/6dN9Wl3vdLmYURMyx3 zLFKF+wkCKPyQ== Received: by cwcc.thunk.org (Postfix, from userid 15806) id BA8A115C3399; Fri, 27 May 2022 11:21:44 -0400 (EDT) Date: Fri, 27 May 2022 11:21:44 -0400 From: "Theodore Ts'o" To: yebin Cc: Eric Whitney , adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, jack@suse.cz Subject: Re: [PATCH -next] ext4: Fix warning in ext4_da_release_space Message-ID: References: <20220520025540.3189247-1-yebin10@huawei.com> <62909593.2040809@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <62909593.2040809@huawei.com> X-Spam-Status: No, score=-4.0 required=5.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On Fri, May 27, 2022 at 05:10:43PM +0800, yebin wrote: > > Maybe you can run syzkaller with log as follows : Oh, so this was something that was found using Syzkaller. Was this using the public syzkaller; if so, can you provide a link the Syzkaller report? If this was a from privately run syzkaller instance, was there a C reproducer? It appears that this was from a fuzzed instance, and it's painful enoguh to extract the file system image from the C reproducer. I have no idea how to extract the file system image from a Syzkaller reproducer. In any case, it sounds like this was triggered from a maliciously corrupted / fuzzed image. Can this warning be triggered from a consistent file system, or does it require a corrupted extent tree? - Ted