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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02B3BEB64DC for ; Thu, 29 Jun 2023 03:19:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231330AbjF2DTE (ORCPT ); Wed, 28 Jun 2023 23:19:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36126 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230314AbjF2DTC (ORCPT ); Wed, 28 Jun 2023 23:19:02 -0400 Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A1B05271B for ; Wed, 28 Jun 2023 20:19:00 -0700 (PDT) Received: from cwcc.thunk.org (pool-173-48-117-150.bstnma.fios.verizon.net [173.48.117.150]) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 35T3Iqpu024993 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 28 Jun 2023 23:18:53 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mit.edu; s=outgoing; t=1688008734; bh=qadv2SsiyzYwbM+c4ST7Ty4dKUz2fdSBs9NoPLrUPyo=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=Dq7+8hEGou0JzRVP3SvEjp/EHC/iOwv2pFgdOxabcroLsMpompjvXQS2c5xan1hxT 4WqPy1ksj/jEGq3lZ3KnTdTVa/GLuK+2vy0i8G0UmTihhbiNk1C9zaCZsVaw7RxQ4v ItXOiZYGT36kPLZTMfZQcQQ1iB5Amv/PDD+w8WvkuPvNlJ89o5H4JCZj0hRVsQfPct VI6EIiaYnNhDFxSM9JOwMH7ef8tasQh1+2gLMTFUFRBSIJFwepezIuWYovV1qKVoiV +Xxw6zwaslicKwLBY+AA4o3xGL4/t9X/DcXMRH7rbSjnHMUaaiJanNfZbyx8uOlxd2 5oHAcj9EuibRQ== Received: by cwcc.thunk.org (Postfix, from userid 15806) id 1E42515C027F; Wed, 28 Jun 2023 23:18:52 -0400 (EDT) Date: Wed, 28 Jun 2023 23:18:52 -0400 From: "Theodore Ts'o" To: syzbot Cc: adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_find_extent (3) Message-ID: <20230629031852.GH8954@mit.edu> References: <000000000000c7970f05ff1ecb4d@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000c7970f05ff1ecb4d@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org #syz set prio: low On Tue, Jun 27, 2023 at 09:16:56AM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 8a28a0b6f1a1 Merge tag 'net-6.4-rc8' of git://git.kernel.o.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=12f5b40b280000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e74b395fe4978721 > dashboard link: https://syzkaller.appspot.com/bug?extid=7ec4ebe875a7076ebb31 > compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15a2b5c0a80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1181c5c0a80000 This report is via writing to the block device, while the file system is mounted. - Ted