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=-10.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 8998CC433F5 for ; Sat, 18 Sep 2021 02:02:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6C5C061052 for ; Sat, 18 Sep 2021 02:02:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238531AbhIRCEP (ORCPT ); Fri, 17 Sep 2021 22:04:15 -0400 Received: from netrider.rowland.org ([192.131.102.5]:55889 "HELO netrider.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S233488AbhIRCEL (ORCPT ); Fri, 17 Sep 2021 22:04:11 -0400 Received: (qmail 69335 invoked by uid 1000); 17 Sep 2021 22:02:45 -0400 Date: Fri, 17 Sep 2021 22:02:45 -0400 From: Alan Stern To: Hao Sun Cc: Greg KH , linux-usb@vger.kernel.org, a.darwish@linutronix.de, johan@kernel.org, Linux Kernel Mailing List , oneukum@suse.com Subject: Re: INFO: task hung in hub_port_init Message-ID: <20210918020245.GA69263@rowland.harvard.edu> References: <20210913135459.GA120302@rowland.harvard.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Sep 18, 2021 at 09:56:52AM +0800, Hao Sun wrote: > Hi Alan, > > Alan Stern 于2021年9月13日周一 下午9:55写道： > > > > On Mon, Sep 13, 2021 at 11:13:15AM +0800, Hao Sun wrote: > > > Hello, > > > > > > When using Healer to fuzz the Linux kernel, the following crash was triggered. > > > > > > HEAD commit: ac08b1c68d1b Merge tag 'pci-v5.15-changes' > > > git tree: upstream > > > console output: > > > https://drive.google.com/file/d/1ZeDIMe-DoY3fB32j2p5ifgpq-Lc5N74I/view?usp=sharing > > > kernel config: https://drive.google.com/file/d/1qrJUXD8ZIeAkg-xojzDpp04v9MtQ8RR6/view?usp=sharing > > > Syzlang reproducer: > > > https://drive.google.com/file/d/1tZe8VmXfxoPqlNpzpGOd-e5WCSWgbkxB/view?usp=sharing > > > Similar report: > > > https://groups.google.com/g/syzkaller-bugs/c/zX55CUzjBOY/m/uf91r0XqAgAJ > > > > > > Sorry, I don't have a C reproducer for this crash but have a Syzlang > > > reproducer. Also, hope the symbolized report can help. > > > Here are the instructions on how to execute Syzlang prog: > > > https://github.com/google/syzkaller/blob/master/docs/executing_syzkaller_programs.md > > > > > > If you fix this issue, please add the following tag to the commit: > > > Reported-by: Hao Sun > > > > There's not much hope of finding the cause of a problem like this > > without seeing the kernel log. > > > > Healer found another Syzlang prog to reproduce this task hang: > https://paste.ubuntu.com/p/HCNYbKJYtx/ > > Also here is a very simple script to execute the reproducer: > https://paste.ubuntu.com/p/ZTGmvFSP6d/ > > The `syz-execprog` and `syz-executor` are needed, so please build > Syzkaller first before running the script. > Hope this can help to find the root cause of the problem. I don't have time to install and figure out how to use Healer and Syzkaller. But if you run the reproducer and post the kernel log, I'll take a look at it. Alan Stern