From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from www262.sakura.ne.jp ([202.181.97.72]:27299 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727143AbeIOWp4 (ORCPT ); Sat, 15 Sep 2018 18:45:56 -0400 Subject: Re: INFO: task hung in fsnotify_connector_destroy_workfn (2) To: syzbot , amir73il@gmail.com, jack@suse.cz, syzkaller-bugs@googlegroups.com References: <0000000000006364200575dfc280@google.com> From: Tetsuo Handa Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Message-ID: <2f4ce251-cf84-8bd2-72fc-a3ff687d5188@I-love.SAKURA.ne.jp> Date: Sun, 16 Sep 2018 02:25:53 +0900 MIME-Version: 1.0 In-Reply-To: <0000000000006364200575dfc280@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On 2018/09/15 11:33, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit:    11da3a7f84f1 Linux 4.19-rc3 > git tree:       upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=141ffbca400000 > kernel config:  https://syzkaller.appspot.com/x/.config?x=9917ff4b798e1a1e > dashboard link: https://syzkaller.appspot.com/bug?extid=6fb572170402d311dd39 > compiler:       gcc (GCC) 8.0.1 20180413 (experimental) > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=136a60ae400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+6fb572170402d311dd39@syzkaller.appspotmail.com > Since it kept printk()ing for at least 93 seconds, it might have kept for 150 seconds. [ 174.614333] hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 [ 268.196102] INFO: task kworker/u4:1:23 blocked for more than 140 seconds. Since the reproducer is simple, this might be lockup due to continuous printk(). If syzbot can reliably reproduce this problem using the reproducer, try ratelimiting printk().