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 20FACC001DC for ; Mon, 31 Jul 2023 10:03:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229578AbjGaKDv (ORCPT ); Mon, 31 Jul 2023 06:03:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44668 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232662AbjGaKDX (ORCPT ); Mon, 31 Jul 2023 06:03:23 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.17.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F1A0D212B; Mon, 31 Jul 2023 03:01:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.com; s=s31663417; t=1690797681; x=1691402481; i=quwenruo.btrfs@gmx.com; bh=V7HRW53KRWNHhAT0gF6aXTpowH2/0UDPGsm5OAQvR8g=; h=X-UI-Sender-Class:Date:Subject:To:Cc:References:From:In-Reply-To; b=aH5wZtUKVATqzjgJIFbOSMUWK69Y8h/8V9njrZ0clUzxllv/+2ZauVdQfELtlK49+AJeOg+ g+lZNIoVGUOFdVfYBvDmdMRDWUJqpkb1GKYZnFX2WGwIZ6piuEMtUgaAu0upB3/cKRtgXFgzH dZD0hZ2cViuy5Nm0Ytrt6uWix5/snWvOU+VqJQtCd2HQRIYaJ0stFyfda8i2/J/n82GteNUmh yn12FxfCwYdRzIYXExgUpA2ii/p7MRimjGai/QNe0SAWZplbhJQfr8+d1yhirHz3v1lpuozwH XxwxYc3vy1gC0UyJBkJq5+aQTEoWiJrEaBYly/svsapb/mP48/5w== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from [0.0.0.0] ([149.28.201.231]) by mail.gmx.net (mrgmx105 [212.227.17.174]) with ESMTPSA (Nemesis) id 1MqJmF-1q3VHX2dXf-00nPXT; Mon, 31 Jul 2023 12:01:21 +0200 Message-ID: Date: Mon, 31 Jul 2023 18:01:14 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [syzbot] [btrfs?] kernel BUG in prepare_to_merge Content-Language: en-US To: Christoph Hellwig Cc: Christoph Hellwig , syzbot , clm@fb.com, dsterba@suse.com, johannes.thumshirn@wdc.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <000000000000a3d67705ff730522@google.com> <000000000000f2ca8f0601bef9ca@google.com> <20230731073707.GA31980@lst.de> <358fab94-4eaa-4977-dd69-fc39810f18e0@gmx.com> From: Qu Wenruo In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:zBKcaGb0CWrRXLgnJA+3HH9Aj96Q7RaMehaENnaq8Lwzthhxqmv Ejv9Pz/Mzfs2gRHyWwQy2hktw6Br3wzlOsdFxj2XadZvSglxl7GJDYZ2pMizFFpd8uwSJEG R6cSanyPf5wJFY0aBTSnnvhWppXbA6ESl/dP/nIaWzSUyiZrB9ZJpmZWTqqKnox424NKXsa IgB/ZtHVCXGHXDPQ8MrJw== UI-OutboundReport: notjunk:1;M01:P0:n8+oEF7hq+E=;i1eT+AAs9D8O1pXMFlD46dGvTCY TOo6LIhJ/h+qprRkzVsKgzNAUcMP9Th4c9vLsWirV1bxe7CIV/D4NVkcIHIr8NyOe0LALFEo+ Iyihy9MwcZixExe1kMqOTL938yYHmMAagTkjbKcb5dPm1CMWTt0gt9kES8ydCqs4MX4rTHY9E Ggc2kQjdj6sZbUEeZGUNPjKk9vQXJocOETGzTUM0YKPYNsm7FH0IJbn8AWkNZk4dXZu6pAQ5p dAY+3z1UVbBMp+vDOPapzGXiwgZCfyYx9o5IWFbaDO6ovDd0a5EXRTZyJ7nPW/Jbp7KJjsEc2 b3S36wbqMj+tyxEB7bDa0kZwedG2qKJf0T3C8VM4ukix2MxToPXJ0XQEhN5WJT1dXSM4WEETH dPYGyUnnDlNq+6aWIWU928UfjIgvAjjlDaNUN9thxZV5T+mNd7rDrNcBCZmpywL7z5zWHOLcU 74qP0zaHNuJdBkvMcUbNIk4rr7U3rnzCnSnEYGuGgC4/OvnjhMfddji5AlNNezJ98WuyjUK/O Xxzcz+5iosuf3JpFQWVLXtiBUuaO+WMMgfIrxAgZiRZRRLJHZQzBNPpp/3HFXBk5+B582wmez xVIJkei8gocvHIA2/zKPofeq0KKwq0LZj6uFW+2w0I8lPjxERZZJPRgmrmO3k6UzdlY5vHfAu HO8QIED3vyzeLJtD7b9MTma3EtHlm03gTuVJmCUe7lp2zkHs+1Vor4fOuIWJskn0WXBzacS+T 3FznuhUMBoyBJ8zPKvnU1TYWdoJHFG8oUcMvUvUdXMk4XYMUHRwdCU+cULan9fakzh4ojDGKc bsjZ+NP+dN0BFIXTPCzcGN/UxyWDgl5snDYsiz6jZAHbwLXDGb+FnZg5kg4Y9xZrCBnIrR3pe p2O7qZV/pjXUx0w3a3yplAkK0XkVQu8ihDL+cwg4gt2pxomDLdgeLWMXlaqRGEg8pcPKO+cWt RKT75dQy689hk6tjvsdOD9IC0dI= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2023/7/31 17:46, Christoph Hellwig wrote: > Thanks. I've not been able to reproduce it on the apparent bisection > commit for more than half an hour, but running it on the originally > reported commit reproduces it after a few minutes. I'll see if I > can come up with a better bisection. > I checked the related code, and didn't find anything obvious. But there is a chance that the image is intentionally corrupted so that we got a reloc root but incorrect root owner. Thus I sent out a patch to make that triggering ASSERT() to a more graceful exit: https://lore.kernel.org/linux-btrfs/24881cc9caf738f6248232709d7357d3186773= b5.1690782754.git.wqu@suse.com/T/#u Although I never got the C reproducer to trigger, thus no confirmation on that. Thanks, Qu