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[24.9.64.241]) by smtp.gmail.com with ESMTPSA id b19sm8421040ilc.41.2021.09.20.07.31.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Sep 2021 07:31:09 -0700 (PDT) Subject: Re: INFO: task hung in hub_port_init To: Alan Stern , Hao Sun , Shuah Khan Cc: Greg KH , linux-usb@vger.kernel.org, a.darwish@linutronix.de, johan@kernel.org, Linux Kernel Mailing List , oneukum@suse.com, Shuah Khan References: <20210913135459.GA120302@rowland.harvard.edu> <20210918020245.GA69263@rowland.harvard.edu> <20210918135301.GA79656@rowland.harvard.edu> From: Shuah Khan Message-ID: <2d776f5b-c6b5-1c05-de37-493fc10a97af@linuxfoundation.org> Date: Mon, 20 Sep 2021 08:31:08 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210918135301.GA79656@rowland.harvard.edu> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/18/21 7:53 AM, Alan Stern wrote: > On Sat, Sep 18, 2021 at 10:17:26AM +0800, Hao Sun wrote: >> Alan Stern 于2021年9月18日周六 上午10:02写道： >>> >>> 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. >>> >> >> Just executed the reproducer, here is the full log: >> https://paste.ubuntu.com/p/x43SqQy8PX/ > > The log indicates that the problem is related to the vhci-hcd driver > somehow. I don't know why those "Module has invalid ELF structures" > errors keep appearing, starting in line 1946 of the log. > > Alan Stern > Thank you. I will take a look. thanks, -- Shuah