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Date:   Sat, 18 Sep 2021 09:53:01 -0400
From:   Alan Stern <stern@rowland.harvard.edu>
To:     Hao Sun <sunhao.th@gmail.com>, Shuah Khan <shuah@kernel.org>
Cc:     Greg KH <gregkh@linuxfoundation.org>, linux-usb@vger.kernel.org,
        a.darwish@linutronix.de, johan@kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        oneukum@suse.com
Subject: Re: INFO: task hung in hub_port_init
Message-ID: <20210918135301.GA79656@rowland.harvard.edu>
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On Sat, Sep 18, 2021 at 10:17:26AM +0800, Hao Sun wrote:
> Alan Stern <stern@rowland.harvard.edu> 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 <stern@rowland.harvard.edu> 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 <sunhao.th@gmail.com>
> > > >
> > > > 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