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 X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44E46C43219 for ; Fri, 3 May 2019 10:30:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1FD86206C3 for ; Fri, 3 May 2019 10:30:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727235AbfECKaI (ORCPT ); Fri, 3 May 2019 06:30:08 -0400 Received: from www262.sakura.ne.jp ([202.181.97.72]:58063 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725777AbfECKaI (ORCPT ); Fri, 3 May 2019 06:30:08 -0400 Received: from fsav403.sakura.ne.jp (fsav403.sakura.ne.jp [133.242.250.102]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id x43ATVk1042216; Fri, 3 May 2019 19:29:31 +0900 (JST) (envelope-from penguin-kernel@i-love.sakura.ne.jp) Received: from www262.sakura.ne.jp (202.181.97.72) by fsav403.sakura.ne.jp (F-Secure/fsigk_smtp/530/fsav403.sakura.ne.jp); Fri, 03 May 2019 19:29:31 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/530/fsav403.sakura.ne.jp) Received: from [192.168.1.8] (softbank126012062002.bbtec.net [126.12.62.2]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id x43ATQ3O042117 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NO); Fri, 3 May 2019 19:29:30 +0900 (JST) (envelope-from penguin-kernel@i-love.sakura.ne.jp) Subject: Re: INFO: task hung in __get_super From: Tetsuo Handa To: Jan Kara , Al Viro Cc: syzbot , axboe@kernel.dk, dvyukov@google.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <001a113ed5540f411c0568cc8418@google.com> <0000000000002cd22305879b22c4@google.com> <20190428185109.GD23075@ZenIV.linux.org.uk> <20190430025501.GB6740@quack2.suse.cz> <20190430031144.GG23075@ZenIV.linux.org.uk> <20190430130739.GA11224@quack2.suse.cz> <20190430131820.GK23075@ZenIV.linux.org.uk> <20190430150753.GA14000@quack2.suse.cz> Message-ID: <71265ac6-c127-838f-d129-a9a95f755ecf@i-love.sakura.ne.jp> Date: Fri, 3 May 2019 19:29:26 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2019/05/01 0:34, Tetsuo Handa wrote: > I still cannot understand what the problem is. (...snipped...) > I guessed that something went wrong with 8083 inside __getblk_gfp(). > How can loop_ctl_mutex be relevant to this problem? > syzbot got similar NMI backtrace. No loop_ctl_mutex is involved. INFO: task hung in mount_bdev (2) https://syzkaller.appspot.com/bug?id=d9b9fa1428ff2466de64fc85256e769f516cea58